Primitive Type usize

The pointer-sized unsigned integer type.

See also the std::usize module.

The size of this primitive is how many bytes it takes to reference any location in memory. For example, on a 32 bit target, this is 4 bytes and on a 64 bit target, this is 8 bytes.

Methods

impl usize

pub const fn min_value() -> usize

Returns the smallest value that can be represented by this integer type.

Examples

Basic usage:

assert_eq!(usize::min_value(), 0);

pub const fn max_value() -> usize

Returns the largest value that can be represented by this integer type.

Examples

Basic usage:

assert_eq!(usize::max_value(), 18446744073709551615);

pub fn from_str_radix(src: &str, radix: u32) -> Result<usize, ParseIntError>

Converts a string slice in a given base to an integer.

The string is expected to be an optional + sign followed by digits. Leading and trailing whitespace represent an error. Digits are a subset of these characters, depending on radix:

• 0-9
• a-z
• A-Z

Panics

This function panics if radix is not in the range from 2 to 36.

Examples

Basic usage:

assert_eq!(usize::from_str_radix("A", 16), Ok(10));

pub const fn count_ones(self) -> u32

Returns the number of ones in the binary representation of self.

Examples

Basic usage:

let n = 0b01001100usize;

assert_eq!(n.count_ones(), 3);

pub const fn count_zeros(self) -> u32

Returns the number of zeros in the binary representation of self.

Examples

Basic usage:

assert_eq!(usize::max_value().count_zeros(), 0);

pub const fn leading_zeros(self) -> u32

Returns the number of leading zeros in the binary representation of self.

Examples

Basic usage:

let n = usize::max_value() >> 2;

assert_eq!(n.leading_zeros(), 2);

pub const fn trailing_zeros(self) -> u32

Returns the number of trailing zeros in the binary representation of self.

Examples

Basic usage:

let n = 0b0101000usize;

assert_eq!(n.trailing_zeros(), 3);

#[must_use = "this returns the result of the operation, without modifying the original"] pub const fn rotate_left(self, n: u32) -> usize

Shifts the bits to the left by a specified amount, n, wrapping the truncated bits to the end of the resulting integer.

Please note this isn't the same operation as the << shifting operator!

Examples

Basic usage:

let n = 0xaa00000000006e1usize;
let m = 0x6e10aa;

assert_eq!(n.rotate_left(12), m);

#[must_use = "this returns the result of the operation, without modifying the original"] pub const fn rotate_right(self, n: u32) -> usize

Shifts the bits to the right by a specified amount, n, wrapping the truncated bits to the beginning of the resulting integer.

Please note this isn't the same operation as the >> shifting operator!

Examples

Basic usage:

let n = 0x6e10aausize;
let m = 0xaa00000000006e1;

assert_eq!(n.rotate_right(12), m);

pub const fn swap_bytes(self) -> usize

Reverses the byte order of the integer.

Examples

Basic usage:

let n = 0x1234567890123456usize;
let m = n.swap_bytes();

assert_eq!(m, 0x5634129078563412);

#[must_use] pub const fn reverse_bits(self) -> usize

Reverses the bit pattern of the integer.

Examples

Basic usage:

let n = 0x1234567890123456usize;
let m = n.reverse_bits();

assert_eq!(m, 0x6a2c48091e6a2c48);

pub const fn from_be(x: usize) -> usize

Converts an integer from big endian to the target's endianness.

On big endian this is a no-op. On little endian the bytes are swapped.

Examples

Basic usage:

let n = 0x1Ausize;

if cfg!(target_endian = "big") {
    assert_eq!(usize::from_be(n), n)
} else {
    assert_eq!(usize::from_be(n), n.swap_bytes())
}

pub const fn from_le(x: usize) -> usize

Converts an integer from little endian to the target's endianness.

On little endian this is a no-op. On big endian the bytes are swapped.

Examples

Basic usage:

let n = 0x1Ausize;

if cfg!(target_endian = "little") {
    assert_eq!(usize::from_le(n), n)
} else {
    assert_eq!(usize::from_le(n), n.swap_bytes())
}

pub const fn to_be(self) -> usize

Converts self to big endian from the target's endianness.

On big endian this is a no-op. On little endian the bytes are swapped.

Examples

Basic usage:

let n = 0x1Ausize;

if cfg!(target_endian = "big") {
    assert_eq!(n.to_be(), n)
} else {
    assert_eq!(n.to_be(), n.swap_bytes())
}

pub const fn to_le(self) -> usize

Converts self to little endian from the target's endianness.

On little endian this is a no-op. On big endian the bytes are swapped.

Examples

Basic usage:

let n = 0x1Ausize;

if cfg!(target_endian = "little") {
    assert_eq!(n.to_le(), n)
} else {
    assert_eq!(n.to_le(), n.swap_bytes())
}

#[must_use = "this returns the result of the operation, without modifying the original"] pub fn checked_add(self, rhs: usize) -> Option<usize>

Checked integer addition. Computes self + rhs, returning None if overflow occurred.

Examples

Basic usage:

assert_eq!((usize::max_value() - 2).checked_add(1), Some(usize::max_value() - 1));
assert_eq!((usize::max_value() - 2).checked_add(3), None);

#[must_use = "this returns the result of the operation, without modifying the original"] pub fn checked_sub(self, rhs: usize) -> Option<usize>

Checked integer subtraction. Computes self - rhs, returning None if overflow occurred.

Examples

Basic usage:

assert_eq!(1usize.checked_sub(1), Some(0));
assert_eq!(0usize.checked_sub(1), None);

#[must_use = "this returns the result of the operation, without modifying the original"] pub fn checked_mul(self, rhs: usize) -> Option<usize>

Checked integer multiplication. Computes self * rhs, returning None if overflow occurred.

Examples

Basic usage:

assert_eq!(5usize.checked_mul(1), Some(5));
assert_eq!(usize::max_value().checked_mul(2), None);

#[must_use = "this returns the result of the operation, without modifying the original"] pub fn checked_div(self, rhs: usize) -> Option<usize>

Checked integer division. Computes self / rhs, returning None if rhs == 0.

Examples

Basic usage:

assert_eq!(128usize.checked_div(2), Some(64));
assert_eq!(1usize.checked_div(0), None);

#[must_use = "this returns the result of the operation, without modifying the original"] pub fn checked_div_euclid(self, rhs: usize) -> Option<usize>

Checked Euclidean division. Computes self.div_euclid(rhs), returning None if rhs == 0.

Examples

Basic usage:

assert_eq!(128usize.checked_div_euclid(2), Some(64));
assert_eq!(1usize.checked_div_euclid(0), None);

#[must_use = "this returns the result of the operation, without modifying the original"] pub fn checked_rem(self, rhs: usize) -> Option<usize>

Checked integer remainder. Computes self % rhs, returning None if rhs == 0.

Examples

Basic usage:

assert_eq!(5usize.checked_rem(2), Some(1));
assert_eq!(5usize.checked_rem(0), None);

#[must_use = "this returns the result of the operation, without modifying the original"] pub fn checked_rem_euclid(self, rhs: usize) -> Option<usize>

Checked Euclidean modulo. Computes self.rem_euclid(rhs), returning None if rhs == 0.

Examples

Basic usage:

assert_eq!(5usize.checked_rem_euclid(2), Some(1));
assert_eq!(5usize.checked_rem_euclid(0), None);

pub fn checked_neg(self) -> Option<usize>

Checked negation. Computes -self, returning None unless self == 0.

Note that negating any positive integer will overflow.

Examples

Basic usage:

assert_eq!(0usize.checked_neg(), Some(0));
assert_eq!(1usize.checked_neg(), None);

#[must_use = "this returns the result of the operation, without modifying the original"] pub fn checked_shl(self, rhs: u32) -> Option<usize>

Checked shift left. Computes self << rhs, returning None if rhs is larger than or equal to the number of bits in self.

Examples

Basic usage:

assert_eq!(0x1usize.checked_shl(4), Some(0x10));
assert_eq!(0x10usize.checked_shl(129), None);

#[must_use = "this returns the result of the operation, without modifying the original"] pub fn checked_shr(self, rhs: u32) -> Option<usize>

Checked shift right. Computes self >> rhs, returning None if rhs is larger than or equal to the number of bits in self.

Examples

Basic usage:

assert_eq!(0x10usize.checked_shr(4), Some(0x1));
assert_eq!(0x10usize.checked_shr(129), None);

#[must_use = "this returns the result of the operation, without modifying the original"] pub fn checked_pow(self, exp: u32) -> Option<usize>

Checked exponentiation. Computes self.pow(exp), returning None if overflow occurred.

Examples

Basic usage:

assert_eq!(2usize.checked_pow(5), Some(32));
assert_eq!(usize::max_value().checked_pow(2), None);

#[must_use = "this returns the result of the operation, without modifying the original"] pub fn saturating_add(self, rhs: usize) -> usize

Saturating integer addition. Computes self + rhs, saturating at the numeric bounds instead of overflowing.

Examples

Basic usage:

assert_eq!(100usize.saturating_add(1), 101);
assert_eq!(200u8.saturating_add(127), 255);

#[must_use = "this returns the result of the operation, without modifying the original"] pub fn saturating_sub(self, rhs: usize) -> usize

Saturating integer subtraction. Computes self - rhs, saturating at the numeric bounds instead of overflowing.

Examples

Basic usage:

assert_eq!(100usize.saturating_sub(27), 73);
assert_eq!(13usize.saturating_sub(127), 0);

#[must_use = "this returns the result of the operation, without modifying the original"] pub fn saturating_mul(self, rhs: usize) -> usize

Saturating integer multiplication. Computes self * rhs, saturating at the numeric bounds instead of overflowing.

Examples

Basic usage:

use std::usize;

assert_eq!(2usize.saturating_mul(10), 20);
assert_eq!((usize::MAX).saturating_mul(10), usize::MAX);

#[must_use = "this returns the result of the operation, without modifying the original"] pub fn saturating_pow(self, exp: u32) -> usize

Saturating integer exponentiation. Computes self.pow(exp), saturating at the numeric bounds instead of overflowing.

Examples

Basic usage:

use std::usize;

assert_eq!(4usize.saturating_pow(3), 64);
assert_eq!(usize::MAX.saturating_pow(2), usize::MAX);

#[must_use = "this returns the result of the operation, without modifying the original"] pub const fn wrapping_add(self, rhs: usize) -> usize

Wrapping (modular) addition. Computes self + rhs, wrapping around at the boundary of the type.

Examples

Basic usage:

assert_eq!(200usize.wrapping_add(55), 255);
assert_eq!(200usize.wrapping_add(usize::max_value()), 199);

#[must_use = "this returns the result of the operation, without modifying the original"] pub const fn wrapping_sub(self, rhs: usize) -> usize

Wrapping (modular) subtraction. Computes self - rhs, wrapping around at the boundary of the type.

Examples

Basic usage:

assert_eq!(100usize.wrapping_sub(100), 0);
assert_eq!(100usize.wrapping_sub(usize::max_value()), 101);

#[must_use = "this returns the result of the operation, without modifying the original"] pub const fn wrapping_mul(self, rhs: usize) -> usize

Wrapping (modular) multiplication. Computes self * rhs, wrapping around at the boundary of the type.

Examples

Basic usage:

Please note that this example is shared between integer types. Which explains why u8 is used here.

assert_eq!(10u8.wrapping_mul(12), 120);
assert_eq!(25u8.wrapping_mul(12), 44);

#[must_use = "this returns the result of the operation, without modifying the original"] pub fn wrapping_div(self, rhs: usize) -> usize

Wrapping (modular) division. Computes self / rhs. Wrapped division on unsigned types is just normal division. There's no way wrapping could ever happen. This function exists, so that all operations are accounted for in the wrapping operations.

Examples

Basic usage:

assert_eq!(100usize.wrapping_div(10), 10);

#[must_use = "this returns the result of the operation, without modifying the original"] pub fn wrapping_div_euclid(self, rhs: usize) -> usize

Wrapping Euclidean division. Computes self.div_euclid(rhs). Wrapped division on unsigned types is just normal division. There's no way wrapping could ever happen. This function exists, so that all operations are accounted for in the wrapping operations. Since, for the positive integers, all common definitions of division are equal, this is exactly equal to self.wrapping_div(rhs).

Examples

Basic usage:

assert_eq!(100usize.wrapping_div_euclid(10), 10);

#[must_use = "this returns the result of the operation, without modifying the original"] pub fn wrapping_rem(self, rhs: usize) -> usize

Wrapping (modular) remainder. Computes self % rhs. Wrapped remainder calculation on unsigned types is just the regular remainder calculation. There's no way wrapping could ever happen. This function exists, so that all operations are accounted for in the wrapping operations.

Examples

Basic usage:

assert_eq!(100usize.wrapping_rem(10), 0);

#[must_use = "this returns the result of the operation, without modifying the original"] pub fn wrapping_rem_euclid(self, rhs: usize) -> usize

Wrapping Euclidean modulo. Computes self.rem_euclid(rhs). Wrapped modulo calculation on unsigned types is just the regular remainder calculation. There's no way wrapping could ever happen. This function exists, so that all operations are accounted for in the wrapping operations. Since, for the positive integers, all common definitions of division are equal, this is exactly equal to self.wrapping_rem(rhs).

Examples

Basic usage:

assert_eq!(100usize.wrapping_rem_euclid(10), 0);

pub const fn wrapping_neg(self) -> usize

Wrapping (modular) negation. Computes -self, wrapping around at the boundary of the type.

Since unsigned types do not have negative equivalents all applications of this function will wrap (except for -0). For values smaller than the corresponding signed type's maximum the result is the same as casting the corresponding signed value. Any larger values are equivalent to MAX + 1 - (val - MAX - 1) where MAX is the corresponding signed type's maximum.

Examples

Basic usage:

Please note that this example is shared between integer types. Which explains why i8 is used here.

assert_eq!(100i8.wrapping_neg(), -100);
assert_eq!((-128i8).wrapping_neg(), -128);

#[must_use = "this returns the result of the operation, without modifying the original"] pub const fn wrapping_shl(self, rhs: u32) -> usize

Panic-free bitwise shift-left; yields self << mask(rhs), where mask removes any high-order bits of rhs that would cause the shift to exceed the bitwidth of the type.

Note that this is not the same as a rotate-left; the RHS of a wrapping shift-left is restricted to the range of the type, rather than the bits shifted out of the LHS being returned to the other end. The primitive integer types all implement a rotate_left function, which may be what you want instead.

Examples

Basic usage:

assert_eq!(1usize.wrapping_shl(7), 128);
assert_eq!(1usize.wrapping_shl(128), 1);

#[must_use = "this returns the result of the operation, without modifying the original"] pub const fn wrapping_shr(self, rhs: u32) -> usize

Panic-free bitwise shift-right; yields self >> mask(rhs), where mask removes any high-order bits of rhs that would cause the shift to exceed the bitwidth of the type.

Note that this is not the same as a rotate-right; the RHS of a wrapping shift-right is restricted to the range of the type, rather than the bits shifted out of the LHS being returned to the other end. The primitive integer types all implement a rotate_right function, which may be what you want instead.

Examples

Basic usage:

assert_eq!(128usize.wrapping_shr(7), 1);
assert_eq!(128usize.wrapping_shr(128), 128);

#[must_use = "this returns the result of the operation, without modifying the original"] pub fn wrapping_pow(self, exp: u32) -> usize

Wrapping (modular) exponentiation. Computes self.pow(exp), wrapping around at the boundary of the type.

Examples

Basic usage:

assert_eq!(3usize.wrapping_pow(5), 243);
assert_eq!(3u8.wrapping_pow(6), 217);

#[must_use = "this returns the result of the operation, without modifying the original"] pub const fn overflowing_add(self, rhs: usize) -> (usize, bool)

Calculates self + rhs

Returns a tuple of the addition along with a boolean indicating whether an arithmetic overflow would occur. If an overflow would have occurred then the wrapped value is returned.

Examples

Basic usage

use std::usize;

assert_eq!(5usize.overflowing_add(2), (7, false));
assert_eq!(usize::MAX.overflowing_add(1), (0, true));

#[must_use = "this returns the result of the operation, without modifying the original"] pub const fn overflowing_sub(self, rhs: usize) -> (usize, bool)

Calculates self - rhs

Returns a tuple of the subtraction along with a boolean indicating whether an arithmetic overflow would occur. If an overflow would have occurred then the wrapped value is returned.

Examples

Basic usage

use std::usize;

assert_eq!(5usize.overflowing_sub(2), (3, false));
assert_eq!(0usize.overflowing_sub(1), (usize::MAX, true));

#[must_use = "this returns the result of the operation, without modifying the original"] pub const fn overflowing_mul(self, rhs: usize) -> (usize, bool)

Calculates the multiplication of self and rhs.

Returns a tuple of the multiplication along with a boolean indicating whether an arithmetic overflow would occur. If an overflow would have occurred then the wrapped value is returned.

Examples

Basic usage:

Please note that this example is shared between integer types. Which explains why u32 is used here.

assert_eq!(5u32.overflowing_mul(2), (10, false));
assert_eq!(1_000_000_000u32.overflowing_mul(10), (1410065408, true));

#[must_use = "this returns the result of the operation, without modifying the original"] pub fn overflowing_div(self, rhs: usize) -> (usize, bool)

Calculates the divisor when self is divided by rhs.

Returns a tuple of the divisor along with a boolean indicating whether an arithmetic overflow would occur. Note that for unsigned integers overflow never occurs, so the second value is always false.

Panics

This function will panic if rhs is 0.

Examples

Basic usage

assert_eq!(5usize.overflowing_div(2), (2, false));

#[must_use = "this returns the result of the operation, without modifying the original"] pub fn overflowing_div_euclid(self, rhs: usize) -> (usize, bool)

Calculates the quotient of Euclidean division self.div_euclid(rhs).

Returns a tuple of the divisor along with a boolean indicating whether an arithmetic overflow would occur. Note that for unsigned integers overflow never occurs, so the second value is always false. Since, for the positive integers, all common definitions of division are equal, this is exactly equal to self.overflowing_div(rhs).

Panics

This function will panic if rhs is 0.

Examples

Basic usage

assert_eq!(5usize.overflowing_div_euclid(2), (2, false));

#[must_use = "this returns the result of the operation, without modifying the original"] pub fn overflowing_rem(self, rhs: usize) -> (usize, bool)

Calculates the remainder when self is divided by rhs.

Returns a tuple of the remainder after dividing along with a boolean indicating whether an arithmetic overflow would occur. Note that for unsigned integers overflow never occurs, so the second value is always false.

Panics

This function will panic if rhs is 0.

Examples

Basic usage

assert_eq!(5usize.overflowing_rem(2), (1, false));

#[must_use = "this returns the result of the operation, without modifying the original"] pub fn overflowing_rem_euclid(self, rhs: usize) -> (usize, bool)

Calculates the remainder self.rem_euclid(rhs) as if by Euclidean division.

Returns a tuple of the modulo after dividing along with a boolean indicating whether an arithmetic overflow would occur. Note that for unsigned integers overflow never occurs, so the second value is always false. Since, for the positive integers, all common definitions of division are equal, this operation is exactly equal to self.overflowing_rem(rhs).

Panics

This function will panic if rhs is 0.

Examples

Basic usage

assert_eq!(5usize.overflowing_rem_euclid(2), (1, false));

pub const fn overflowing_neg(self) -> (usize, bool)

Negates self in an overflowing fashion.

Returns !self + 1 using wrapping operations to return the value that represents the negation of this unsigned value. Note that for positive unsigned values overflow always occurs, but negating 0 does not overflow.

Examples

Basic usage

assert_eq!(0usize.overflowing_neg(), (0, false));
assert_eq!(2usize.overflowing_neg(), (-2i32 as usize, true));

#[must_use = "this returns the result of the operation, without modifying the original"] pub const fn overflowing_shl(self, rhs: u32) -> (usize, bool)

Shifts self left by rhs bits.

Returns a tuple of the shifted version of self along with a boolean indicating whether the shift value was larger than or equal to the number of bits. If the shift value is too large, then value is masked (N-1) where N is the number of bits, and this value is then used to perform the shift.

Examples

Basic usage

assert_eq!(0x1usize.overflowing_shl(4), (0x10, false));
assert_eq!(0x1usize.overflowing_shl(132), (0x10, true));

#[must_use = "this returns the result of the operation, without modifying the original"] pub const fn overflowing_shr(self, rhs: u32) -> (usize, bool)

Shifts self right by rhs bits.

Returns a tuple of the shifted version of self along with a boolean indicating whether the shift value was larger than or equal to the number of bits. If the shift value is too large, then value is masked (N-1) where N is the number of bits, and this value is then used to perform the shift.

Examples

Basic usage

assert_eq!(0x10usize.overflowing_shr(4), (0x1, false));
assert_eq!(0x10usize.overflowing_shr(132), (0x1, true));

#[must_use = "this returns the result of the operation, without modifying the original"] pub fn overflowing_pow(self, exp: u32) -> (usize, bool)

Raises self to the power of exp, using exponentiation by squaring.

Returns a tuple of the exponentiation along with a bool indicating whether an overflow happened.

Examples

Basic usage:

assert_eq!(3usize.overflowing_pow(5), (243, false));
assert_eq!(3u8.overflowing_pow(6), (217, true));

#[must_use = "this returns the result of the operation, without modifying the original"] pub fn pow(self, exp: u32) -> usize

Raises self to the power of exp, using exponentiation by squaring.

Examples

Basic usage:

assert_eq!(2usize.pow(5), 32);

#[must_use = "this returns the result of the operation, without modifying the original"] pub fn div_euclid(self, rhs: usize) -> usize

Performs Euclidean division.

Since, for the positive integers, all common definitions of division are equal, this is exactly equal to self / rhs.

Examples

Basic usage:

assert_eq!(7usize.div_euclid(4), 1); // or any other integer type

#[must_use = "this returns the result of the operation, without modifying the original"] pub fn rem_euclid(self, rhs: usize) -> usize

Calculates the least remainder of self (mod rhs).

Since, for the positive integers, all common definitions of division are equal, this is exactly equal to self % rhs.

Examples

Basic usage:

assert_eq!(7usize.rem_euclid(4), 3); // or any other integer type

pub fn is_power_of_two(self) -> bool

Returns true if and only if self == 2^k for some k.

Examples

Basic usage:

assert!(16usize.is_power_of_two());
assert!(!10usize.is_power_of_two());

pub fn next_power_of_two(self) -> usize

Returns the smallest power of two greater than or equal to self.

When return value overflows (i.e., self > (1 << (N-1)) for type uN), it panics in debug mode and return value is wrapped to 0 in release mode (the only situation in which method can return 0).

Examples

Basic usage:

assert_eq!(2usize.next_power_of_two(), 2);
assert_eq!(3usize.next_power_of_two(), 4);

pub fn checked_next_power_of_two(self) -> Option<usize>

Returns the smallest power of two greater than or equal to n. If the next power of two is greater than the type's maximum value, None is returned, otherwise the power of two is wrapped in Some.

Examples

Basic usage:

assert_eq!(2usize.checked_next_power_of_two(), Some(2));
assert_eq!(3usize.checked_next_power_of_two(), Some(4));
assert_eq!(usize::max_value().checked_next_power_of_two(), None);

pub fn wrapping_next_power_of_two(self) -> usize

🔬 This is a nightly-only experimental API. (wrapping_next_power_of_two #32463)

needs decision on wrapping behaviour

Returns the smallest power of two greater than or equal to n. If the next power of two is greater than the type's maximum value, the return value is wrapped to 0.

Examples

Basic usage:

#![feature(wrapping_next_power_of_two)]

assert_eq!(2usize.wrapping_next_power_of_two(), 2);
assert_eq!(3usize.wrapping_next_power_of_two(), 4);
assert_eq!(usize::max_value().wrapping_next_power_of_two(), 0);

pub fn to_be_bytes(self) -> [u8; 8]

Return the memory representation of this integer as a byte array in big-endian (network) byte order.

Note: This function returns an array of length 2, 4 or 8 bytes depending on the target pointer size.

Examples

let bytes = 0x1234567890123456usize.to_be_bytes();
assert_eq!(bytes, [0x12, 0x34, 0x56, 0x78, 0x90, 0x12, 0x34, 0x56]);

pub fn to_le_bytes(self) -> [u8; 8]

Return the memory representation of this integer as a byte array in little-endian byte order.

Note: This function returns an array of length 2, 4 or 8 bytes depending on the target pointer size.

Examples

let bytes = 0x1234567890123456usize.to_le_bytes();
assert_eq!(bytes, [0x56, 0x34, 0x12, 0x90, 0x78, 0x56, 0x34, 0x12]);

pub fn to_ne_bytes(self) -> [u8; 8]

Return the memory representation of this integer as a byte array in native byte order.

As the target platform's native endianness is used, portable code should use to_be_bytes or to_le_bytes, as appropriate, instead.

Note: This function returns an array of length 2, 4 or 8 bytes depending on the target pointer size.

Examples

let bytes = 0x1234567890123456usize.to_ne_bytes();
assert_eq!(bytes, if cfg!(target_endian = "big") {
        [0x12, 0x34, 0x56, 0x78, 0x90, 0x12, 0x34, 0x56]
    } else {
        [0x56, 0x34, 0x12, 0x90, 0x78, 0x56, 0x34, 0x12]
    });

pub fn from_be_bytes(bytes: [u8; 8]) -> usize

Create an integer value from its representation as a byte array in big endian.

Note: This function takes an array of length 2, 4 or 8 bytes depending on the target pointer size.

Examples

let value = usize::from_be_bytes([0x12, 0x34, 0x56, 0x78, 0x90, 0x12, 0x34, 0x56]);
assert_eq!(value, 0x1234567890123456);

When starting from a slice rather than an array, fallible conversion APIs can be used:

use std::convert::TryInto;

fn read_be_usize(input: &mut &[u8]) -> usize {
    let (int_bytes, rest) = input.split_at(std::mem::size_of::<usize>());
    *input = rest;
    usize::from_be_bytes(int_bytes.try_into().unwrap())
}

pub fn from_le_bytes(bytes: [u8; 8]) -> usize

Create an integer value from its representation as a byte array in little endian.

Note: This function takes an array of length 2, 4 or 8 bytes depending on the target pointer size.

Examples

let value = usize::from_le_bytes([0x56, 0x34, 0x12, 0x90, 0x78, 0x56, 0x34, 0x12]);
assert_eq!(value, 0x1234567890123456);

When starting from a slice rather than an array, fallible conversion APIs can be used:

use std::convert::TryInto;

fn read_le_usize(input: &mut &[u8]) -> usize {
    let (int_bytes, rest) = input.split_at(std::mem::size_of::<usize>());
    *input = rest;
    usize::from_le_bytes(int_bytes.try_into().unwrap())
}

pub fn from_ne_bytes(bytes: [u8; 8]) -> usize

Create an integer value from its memory representation as a byte array in native endianness.

As the target platform's native endianness is used, portable code likely wants to use from_be_bytes or from_le_bytes, as appropriate instead.

Note: This function takes an array of length 2, 4 or 8 bytes depending on the target pointer size.

Examples

let value = usize::from_ne_bytes(if cfg!(target_endian = "big") {
        [0x12, 0x34, 0x56, 0x78, 0x90, 0x12, 0x34, 0x56]
    } else {
        [0x56, 0x34, 0x12, 0x90, 0x78, 0x56, 0x34, 0x12]
    });
assert_eq!(value, 0x1234567890123456);

When starting from a slice rather than an array, fallible conversion APIs can be used:

use std::convert::TryInto;

fn read_ne_usize(input: &mut &[u8]) -> usize {
    let (int_bytes, rest) = input.split_at(std::mem::size_of::<usize>());
    *input = rest;
    usize::from_ne_bytes(int_bytes.try_into().unwrap())
}

Trait Implementations

impl<'_> BitOr<&'_ usize> for usize

type Output = <usize as BitOr<usize>>::Output

The resulting type after applying the | operator.

fn bitor(self, other: &usize) -> <usize as BitOr<usize>>::Output

Performs the | operation.

impl<'_, '_> BitOr<&'_ usize> for &'_ usize

type Output = <usize as BitOr<usize>>::Output

The resulting type after applying the | operator.

fn bitor(self, other: &usize) -> <usize as BitOr<usize>>::Output

Performs the | operation.

impl<'a> BitOr<usize> for &'a usize

type Output = <usize as BitOr<usize>>::Output

The resulting type after applying the | operator.

fn bitor(self, other: usize) -> <usize as BitOr<usize>>::Output

Performs the | operation.

impl BitOr<usize> for usize

type Output = usize

The resulting type after applying the | operator.

fn bitor(self, rhs: usize) -> usize

Performs the | operation.

impl<'_> DivAssign<&'_ usize> for usize

fn div_assign(&mut self, other: &usize)

Performs the /= operation.

impl DivAssign<usize> for usize

fn div_assign(&mut self, other: usize)

Performs the /= operation.

impl AddAssign<usize> for usize

fn add_assign(&mut self, other: usize)

Performs the += operation.

impl<'_> AddAssign<&'_ usize> for usize

fn add_assign(&mut self, other: &usize)

Performs the += operation.

impl<'_> Rem<&'_ usize> for usize

type Output = <usize as Rem<usize>>::Output

The resulting type after applying the % operator.

fn rem(self, other: &usize) -> <usize as Rem<usize>>::Output

Performs the % operation.

impl<'_, '_> Rem<&'_ usize> for &'_ usize

type Output = <usize as Rem<usize>>::Output

The resulting type after applying the % operator.

fn rem(self, other: &usize) -> <usize as Rem<usize>>::Output

Performs the % operation.

impl Rem<usize> for usize

This operation satisfies n % d == n - (n / d) * d. The result has the same sign as the left operand.

type Output = usize

The resulting type after applying the % operator.

fn rem(self, other: usize) -> usize

Performs the % operation.

impl<'a> Rem<usize> for &'a usize

type Output = <usize as Rem<usize>>::Output

The resulting type after applying the % operator.

fn rem(self, other: usize) -> <usize as Rem<usize>>::Output

Performs the % operation.

impl<'_> Div<&'_ usize> for usize

type Output = <usize as Div<usize>>::Output

The resulting type after applying the / operator.

fn div(self, other: &usize) -> <usize as Div<usize>>::Output

Performs the / operation.

impl<'_, '_> Div<&'_ usize> for &'_ usize

type Output = <usize as Div<usize>>::Output

The resulting type after applying the / operator.

fn div(self, other: &usize) -> <usize as Div<usize>>::Output

Performs the / operation.

impl<'a> Div<usize> for &'a usize

type Output = <usize as Div<usize>>::Output

The resulting type after applying the / operator.

fn div(self, other: usize) -> <usize as Div<usize>>::Output

Performs the / operation.

impl Div<usize> for usize

This operation rounds towards zero, truncating any fractional part of the exact result.

type Output = usize

The resulting type after applying the / operator.

fn div(self, other: usize) -> usize

Performs the / operation.

impl<T> SliceIndex<[T]> for usize

type Output = T

The output type returned by methods.

fn get(self, slice: &[T]) -> Option<&T>

🔬 This is a nightly-only experimental API. (slice_index_methods #0)

Returns a shared reference to the output at this location, if in bounds.

fn get_mut(self, slice: &mut [T]) -> Option<&mut T>

🔬 This is a nightly-only experimental API. (slice_index_methods #0)

Returns a mutable reference to the output at this location, if in bounds.

Important traits for &'_ mut F

impl<'_, F> Future for &'_ mut F where
    F: Unpin + Future + ?Sized,  type Output = <F as Future>::Output;impl<'_, I> Iterator for &'_ mut I where
    I: Iterator + ?Sized,  type Item = <I as Iterator>::Item;impl<'_, R: Read + ?Sized> Read for &'_ mut Rimpl<'_, W: Write + ?Sized> Write for &'_ mut W

unsafe fn get_unchecked(self, slice: &[T]) -> &T

🔬 This is a nightly-only experimental API. (slice_index_methods #0)

Returns a shared reference to the output at this location, without performing any bounds checking. Calling this method with an out-of-bounds index is [undefined behavior] even if the resulting reference is not used. [undefined behavior]: ../../reference/behavior-considered-undefined.html

Important traits for &'_ mut F

impl<'_, F> Future for &'_ mut F where
    F: Unpin + Future + ?Sized,  type Output = <F as Future>::Output;impl<'_, I> Iterator for &'_ mut I where
    I: Iterator + ?Sized,  type Item = <I as Iterator>::Item;impl<'_, R: Read + ?Sized> Read for &'_ mut Rimpl<'_, W: Write + ?Sized> Write for &'_ mut W

unsafe fn get_unchecked_mut(self, slice: &mut [T]) -> &mut T

🔬 This is a nightly-only experimental API. (slice_index_methods #0)

Returns a mutable reference to the output at this location, without performing any bounds checking. Calling this method with an out-of-bounds index is [undefined behavior] even if the resulting reference is not used. [undefined behavior]: ../../reference/behavior-considered-undefined.html

Important traits for &'_ mut F

impl<'_, F> Future for &'_ mut F where
    F: Unpin + Future + ?Sized,  type Output = <F as Future>::Output;impl<'_, I> Iterator for &'_ mut I where
    I: Iterator + ?Sized,  type Item = <I as Iterator>::Item;impl<'_, R: Read + ?Sized> Read for &'_ mut Rimpl<'_, W: Write + ?Sized> Write for &'_ mut W

fn index(self, slice: &[T]) -> &T

🔬 This is a nightly-only experimental API. (slice_index_methods #0)

Returns a shared reference to the output at this location, panicking if out of bounds.

Important traits for &'_ mut F

impl<'_, F> Future for &'_ mut F where
    F: Unpin + Future + ?Sized,  type Output = <F as Future>::Output;impl<'_, I> Iterator for &'_ mut I where
    I: Iterator + ?Sized,  type Item = <I as Iterator>::Item;impl<'_, R: Read + ?Sized> Read for &'_ mut Rimpl<'_, W: Write + ?Sized> Write for &'_ mut W

fn index_mut(self, slice: &mut [T]) -> &mut T

🔬 This is a nightly-only experimental API. (slice_index_methods #0)

Returns a mutable reference to the output at this location, panicking if out of bounds.

impl LowerHex for usize

fn fmt(&self, f: &mut Formatter) -> Result<(), Error>

Formats the value using the given formatter.

impl Display for usize

fn fmt(&self, f: &mut Formatter) -> Result<(), Error>

Formats the value using the given formatter.

impl BitAnd<usize> for usize

type Output = usize

The resulting type after applying the & operator.

fn bitand(self, rhs: usize) -> usize

Performs the & operation.

impl<'a> BitAnd<usize> for &'a usize

type Output = <usize as BitAnd<usize>>::Output

The resulting type after applying the & operator.

fn bitand(self, other: usize) -> <usize as BitAnd<usize>>::Output

Performs the & operation.

impl<'_, '_> BitAnd<&'_ usize> for &'_ usize

type Output = <usize as BitAnd<usize>>::Output

The resulting type after applying the & operator.

fn bitand(self, other: &usize) -> <usize as BitAnd<usize>>::Output

Performs the & operation.

impl<'_> BitAnd<&'_ usize> for usize

type Output = <usize as BitAnd<usize>>::Output

The resulting type after applying the & operator.

fn bitand(self, other: &usize) -> <usize as BitAnd<usize>>::Output

Performs the & operation.

impl<'a> Sum<&'a usize> for usize

fn sum<I>(iter: I) -> usize where
    I: Iterator<Item = &'a usize>, 

Method which takes an iterator and generates Self from the elements by "summing up" the items.

impl Sum<usize> for usize

fn sum<I>(iter: I) -> usize where
    I: Iterator<Item = usize>, 

Method which takes an iterator and generates Self from the elements by "summing up" the items.

impl<'_> BitOrAssign<&'_ usize> for usize

fn bitor_assign(&mut self, other: &usize)

Performs the |= operation.

impl BitOrAssign<usize> for usize

fn bitor_assign(&mut self, other: usize)

Performs the |= operation.

impl<'_, '_> Mul<&'_ usize> for &'_ usize

type Output = <usize as Mul<usize>>::Output

The resulting type after applying the * operator.

fn mul(self, other: &usize) -> <usize as Mul<usize>>::Output

Performs the * operation.

impl<'_> Mul<&'_ usize> for usize

type Output = <usize as Mul<usize>>::Output

The resulting type after applying the * operator.

fn mul(self, other: &usize) -> <usize as Mul<usize>>::Output

Performs the * operation.

impl<'a> Mul<usize> for &'a usize

type Output = <usize as Mul<usize>>::Output

The resulting type after applying the * operator.

fn mul(self, other: usize) -> <usize as Mul<usize>>::Output

Performs the * operation.

impl Mul<usize> for usize

type Output = usize

The resulting type after applying the * operator.

fn mul(self, other: usize) -> usize

Performs the * operation.

impl Eq for usize

impl Debug for usize

fn fmt(&self, f: &mut Formatter) -> Result<(), Error>

Formats the value using the given formatter.

impl<'_> MulAssign<&'_ usize> for usize

fn mul_assign(&mut self, other: &usize)

Performs the *= operation.

impl MulAssign<usize> for usize

fn mul_assign(&mut self, other: usize)

Performs the *= operation.

impl ShrAssign<i128> for usize

fn shr_assign(&mut self, other: i128)

Performs the >>= operation.

impl<'_> ShrAssign<&'_ usize> for usize

fn shr_assign(&mut self, other: &usize)

Performs the >>= operation.

impl ShrAssign<u128> for usize

fn shr_assign(&mut self, other: u128)

Performs the >>= operation.

impl<'_> ShrAssign<&'_ u16> for usize

fn shr_assign(&mut self, other: &u16)

Performs the >>= operation.

impl ShrAssign<i64> for usize

fn shr_assign(&mut self, other: i64)

Performs the >>= operation.

impl<'_> ShrAssign<&'_ i64> for usize

fn shr_assign(&mut self, other: &i64)

Performs the >>= operation.

impl<'_> ShrAssign<&'_ i16> for usize

fn shr_assign(&mut self, other: &i16)

Performs the >>= operation.

impl ShrAssign<u32> for usize

fn shr_assign(&mut self, other: u32)

Performs the >>= operation.

impl ShrAssign<i16> for usize

fn shr_assign(&mut self, other: i16)

Performs the >>= operation.

impl<'_> ShrAssign<&'_ i8> for usize

fn shr_assign(&mut self, other: &i8)

Performs the >>= operation.

impl<'_> ShrAssign<&'_ u64> for usize

fn shr_assign(&mut self, other: &u64)

Performs the >>= operation.

impl ShrAssign<usize> for usize

fn shr_assign(&mut self, other: usize)

Performs the >>= operation.

impl ShrAssign<i8> for usize

fn shr_assign(&mut self, other: i8)

Performs the >>= operation.

impl<'_> ShrAssign<&'_ u32> for usize

fn shr_assign(&mut self, other: &u32)

Performs the >>= operation.

impl ShrAssign<u64> for usize

fn shr_assign(&mut self, other: u64)

Performs the >>= operation.

impl ShrAssign<u8> for usize

fn shr_assign(&mut self, other: u8)

Performs the >>= operation.

impl<'_> ShrAssign<&'_ isize> for usize

fn shr_assign(&mut self, other: &isize)

Performs the >>= operation.

impl ShrAssign<u16> for usize

fn shr_assign(&mut self, other: u16)

Performs the >>= operation.

impl<'_> ShrAssign<&'_ i32> for usize

fn shr_assign(&mut self, other: &i32)

Performs the >>= operation.

impl<'_> ShrAssign<&'_ u8> for usize

fn shr_assign(&mut self, other: &u8)

Performs the >>= operation.

impl ShrAssign<isize> for usize

fn shr_assign(&mut self, other: isize)

Performs the >>= operation.

impl ShrAssign<i32> for usize

fn shr_assign(&mut self, other: i32)

Performs the >>= operation.

impl<'_> ShrAssign<&'_ u128> for usize

fn shr_assign(&mut self, other: &u128)

Performs the >>= operation.

impl<'_> ShrAssign<&'_ i128> for usize

fn shr_assign(&mut self, other: &i128)

Performs the >>= operation.

impl UpperHex for usize

fn fmt(&self, f: &mut Formatter) -> Result<(), Error>

Formats the value using the given formatter.

impl Step for usize

fn steps_between(start: &usize, end: &usize) -> Option<usize>

🔬 This is a nightly-only experimental API. (step_trait #42168)

likely to be replaced by finer-grained traits

Returns the number of steps between two step objects. The count is inclusive of start and exclusive of end.

fn add_usize(&self, n: usize) -> Option<usize>

🔬 This is a nightly-only experimental API. (step_trait #42168)

likely to be replaced by finer-grained traits

Adds a usize, returning None on overflow.

fn sub_usize(&self, n: usize) -> Option<usize>

🔬 This is a nightly-only experimental API. (step_trait #42168)

likely to be replaced by finer-grained traits

Subtracts a usize, returning None on underflow.

fn replace_one(&mut self) -> usize

🔬 This is a nightly-only experimental API. (step_trait #42168)

likely to be replaced by finer-grained traits

Replaces this step with 1, returning itself.

fn replace_zero(&mut self) -> usize

🔬 This is a nightly-only experimental API. (step_trait #42168)

likely to be replaced by finer-grained traits

Replaces this step with 0, returning itself.

fn add_one(&self) -> usize

🔬 This is a nightly-only experimental API. (step_trait #42168)

likely to be replaced by finer-grained traits

Adds one to this step, returning the result.

fn sub_one(&self) -> usize

🔬 This is a nightly-only experimental API. (step_trait #42168)

likely to be replaced by finer-grained traits

Subtracts one to this step, returning the result.

impl<'_> Sub<&'_ usize> for usize

type Output = <usize as Sub<usize>>::Output

The resulting type after applying the - operator.

fn sub(self, other: &usize) -> <usize as Sub<usize>>::Output

Performs the - operation.

impl Sub<usize> for usize

type Output = usize

The resulting type after applying the - operator.

fn sub(self, other: usize) -> usize

Performs the - operation.

impl<'_, '_> Sub<&'_ usize> for &'_ usize

type Output = <usize as Sub<usize>>::Output

The resulting type after applying the - operator.

fn sub(self, other: &usize) -> <usize as Sub<usize>>::Output

Performs the - operation.

impl<'a> Sub<usize> for &'a usize

type Output = <usize as Sub<usize>>::Output

The resulting type after applying the - operator.

fn sub(self, other: usize) -> <usize as Sub<usize>>::Output

Performs the - operation.

impl<'_> Not for &'_ usize

type Output = <usize as Not>::Output

The resulting type after applying the ! operator.

fn not(self) -> <usize as Not>::Output

Performs the unary ! operation.

impl Not for usize

type Output = usize

The resulting type after applying the ! operator.

fn not(self) -> usize

Performs the unary ! operation.

impl PartialEq<usize> for usize

fn eq(&self, other: &usize) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &usize) -> bool

This method tests for !=.

impl FromStr for usize

type Err = ParseIntError

The associated error which can be returned from parsing.

fn from_str(src: &str) -> Result<usize, ParseIntError>

Parses a string s to return a value of this type.

impl Octal for usize

fn fmt(&self, f: &mut Formatter) -> Result<(), Error>

Formats the value using the given formatter.

impl<'_> ShlAssign<&'_ u32> for usize

fn shl_assign(&mut self, other: &u32)

Performs the <<= operation.

impl<'_> ShlAssign<&'_ i64> for usize

fn shl_assign(&mut self, other: &i64)

Performs the <<= operation.

impl<'_> ShlAssign<&'_ u16> for usize

fn shl_assign(&mut self, other: &u16)

Performs the <<= operation.

impl ShlAssign<i8> for usize

fn shl_assign(&mut self, other: i8)

Performs the <<= operation.

impl<'_> ShlAssign<&'_ i128> for usize

fn shl_assign(&mut self, other: &i128)

Performs the <<= operation.

impl ShlAssign<i32> for usize

fn shl_assign(&mut self, other: i32)

Performs the <<= operation.

impl<'_> ShlAssign<&'_ i8> for usize

fn shl_assign(&mut self, other: &i8)

Performs the <<= operation.

impl ShlAssign<i128> for usize

fn shl_assign(&mut self, other: i128)

Performs the <<= operation.

impl ShlAssign<u64> for usize

fn shl_assign(&mut self, other: u64)

Performs the <<= operation.

impl<'_> ShlAssign<&'_ i16> for usize

fn shl_assign(&mut self, other: &i16)

Performs the <<= operation.

impl ShlAssign<u8> for usize

fn shl_assign(&mut self, other: u8)

Performs the <<= operation.

impl ShlAssign<i16> for usize

fn shl_assign(&mut self, other: i16)

Performs the <<= operation.

impl<'_> ShlAssign<&'_ u64> for usize

fn shl_assign(&mut self, other: &u64)

Performs the <<= operation.

impl ShlAssign<i64> for usize

fn shl_assign(&mut self, other: i64)

Performs the <<= operation.

impl<'_> ShlAssign<&'_ i32> for usize

fn shl_assign(&mut self, other: &i32)

Performs the <<= operation.

impl<'_> ShlAssign<&'_ u128> for usize

fn shl_assign(&mut self, other: &u128)

Performs the <<= operation.

impl<'_> ShlAssign<&'_ u8> for usize

fn shl_assign(&mut self, other: &u8)

Performs the <<= operation.

impl ShlAssign<u32> for usize

fn shl_assign(&mut self, other: u32)

Performs the <<= operation.

impl ShlAssign<u16> for usize

fn shl_assign(&mut self, other: u16)

Performs the <<= operation.

impl ShlAssign<u128> for usize

fn shl_assign(&mut self, other: u128)

Performs the <<= operation.

impl<'_> ShlAssign<&'_ isize> for usize

fn shl_assign(&mut self, other: &isize)

Performs the <<= operation.

impl ShlAssign<isize> for usize

fn shl_assign(&mut self, other: isize)

Performs the <<= operation.

impl ShlAssign<usize> for usize

fn shl_assign(&mut self, other: usize)

Performs the <<= operation.

impl<'_> ShlAssign<&'_ usize> for usize

fn shl_assign(&mut self, other: &usize)

Performs the <<= operation.

impl PartialOrd<usize> for usize

fn partial_cmp(&self, other: &usize) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &usize) -> bool

This method tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &usize) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator.

fn ge(&self, other: &usize) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator.

fn gt(&self, other: &usize) -> bool

This method tests greater than (for self and other) and is used by the > operator.

impl<'_> BitAndAssign<&'_ usize> for usize

fn bitand_assign(&mut self, other: &usize)

Performs the &= operation.

impl BitAndAssign<usize> for usize

fn bitand_assign(&mut self, other: usize)

Performs the &= operation.

impl Hash for usize

fn hash<H>(&self, state: &mut H) where
    H: Hasher, 

Feeds this value into the given [Hasher].

fn hash_slice<H>(data: &[usize], state: &mut H) where
    H: Hasher, 

Feeds a slice of this type into the given [Hasher].

impl<'a> Shl<u32> for &'a usize

type Output = <usize as Shl<u32>>::Output

The resulting type after applying the << operator.

fn shl(self, other: u32) -> <usize as Shl<u32>>::Output

Performs the << operation.

impl<'_> Shl<&'_ u16> for usize

type Output = <usize as Shl<u16>>::Output

The resulting type after applying the << operator.

fn shl(self, other: &u16) -> <usize as Shl<u16>>::Output

Performs the << operation.

impl<'_, '_> Shl<&'_ i128> for &'_ usize

type Output = <usize as Shl<i128>>::Output

The resulting type after applying the << operator.

fn shl(self, other: &i128) -> <usize as Shl<i128>>::Output

Performs the << operation.

impl<'_, '_> Shl<&'_ i32> for &'_ usize

type Output = <usize as Shl<i32>>::Output

The resulting type after applying the << operator.

fn shl(self, other: &i32) -> <usize as Shl<i32>>::Output

Performs the << operation.

impl<'a> Shl<usize> for &'a usize

type Output = <usize as Shl<usize>>::Output

The resulting type after applying the << operator.

fn shl(self, other: usize) -> <usize as Shl<usize>>::Output

Performs the << operation.

impl<'_, '_> Shl<&'_ u16> for &'_ usize

type Output = <usize as Shl<u16>>::Output

The resulting type after applying the << operator.

fn shl(self, other: &u16) -> <usize as Shl<u16>>::Output

Performs the << operation.

impl<'_, '_> Shl<&'_ i8> for &'_ usize

type Output = <usize as Shl<i8>>::Output

The resulting type after applying the << operator.

fn shl(self, other: &i8) -> <usize as Shl<i8>>::Output

Performs the << operation.

impl<'_> Shl<&'_ u32> for usize

type Output = <usize as Shl<u32>>::Output

The resulting type after applying the << operator.

fn shl(self, other: &u32) -> <usize as Shl<u32>>::Output

Performs the << operation.

impl<'_, '_> Shl<&'_ i16> for &'_ usize

type Output = <usize as Shl<i16>>::Output

The resulting type after applying the << operator.

fn shl(self, other: &i16) -> <usize as Shl<i16>>::Output

Performs the << operation.

impl<'_, '_> Shl<&'_ i64> for &'_ usize

type Output = <usize as Shl<i64>>::Output

The resulting type after applying the << operator.

fn shl(self, other: &i64) -> <usize as Shl<i64>>::Output

Performs the << operation.

impl<'_, '_> Shl<&'_ u64> for &'_ usize

type Output = <usize as Shl<u64>>::Output

The resulting type after applying the << operator.

fn shl(self, other: &u64) -> <usize as Shl<u64>>::Output

Performs the << operation.

impl Shl<usize> for usize

type Output = usize

The resulting type after applying the << operator.

fn shl(self, other: usize) -> usize

Performs the << operation.

impl<'a> Shl<u64> for &'a usize

type Output = <usize as Shl<u64>>::Output

The resulting type after applying the << operator.

fn shl(self, other: u64) -> <usize as Shl<u64>>::Output

Performs the << operation.

impl<'_, '_> Shl<&'_ u32> for &'_ usize

type Output = <usize as Shl<u32>>::Output

The resulting type after applying the << operator.

fn shl(self, other: &u32) -> <usize as Shl<u32>>::Output

Performs the << operation.

impl<'a> Shl<i16> for &'a usize

type Output = <usize as Shl<i16>>::Output

The resulting type after applying the << operator.

fn shl(self, other: i16) -> <usize as Shl<i16>>::Output

Performs the << operation.

impl<'_> Shl<&'_ u128> for usize

type Output = <usize as Shl<u128>>::Output

The resulting type after applying the << operator.

fn shl(self, other: &u128) -> <usize as Shl<u128>>::Output

Performs the << operation.

impl Shl<u32> for usize

type Output = usize

The resulting type after applying the << operator.

fn shl(self, other: u32) -> usize

Performs the << operation.

impl<'_, '_> Shl<&'_ usize> for &'_ usize

type Output = <usize as Shl<usize>>::Output

The resulting type after applying the << operator.

fn shl(self, other: &usize) -> <usize as Shl<usize>>::Output

Performs the << operation.

impl Shl<isize> for usize

type Output = usize

The resulting type after applying the << operator.

fn shl(self, other: isize) -> usize

Performs the << operation.

impl<'_, '_> Shl<&'_ u128> for &'_ usize

type Output = <usize as Shl<u128>>::Output

The resulting type after applying the << operator.

fn shl(self, other: &u128) -> <usize as Shl<u128>>::Output

Performs the << operation.

impl<'a> Shl<i128> for &'a usize

type Output = <usize as Shl<i128>>::Output

The resulting type after applying the << operator.

fn shl(self, other: i128) -> <usize as Shl<i128>>::Output

Performs the << operation.

impl Shl<i8> for usize

type Output = usize

The resulting type after applying the << operator.

fn shl(self, other: i8) -> usize

Performs the << operation.

impl<'a> Shl<isize> for &'a usize

type Output = <usize as Shl<isize>>::Output

The resulting type after applying the << operator.

fn shl(self, other: isize) -> <usize as Shl<isize>>::Output

Performs the << operation.

impl<'_> Shl<&'_ i32> for usize

type Output = <usize as Shl<i32>>::Output

The resulting type after applying the << operator.

fn shl(self, other: &i32) -> <usize as Shl<i32>>::Output

Performs the << operation.

impl<'a> Shl<u8> for &'a usize

type Output = <usize as Shl<u8>>::Output

The resulting type after applying the << operator.

fn shl(self, other: u8) -> <usize as Shl<u8>>::Output

Performs the << operation.

impl Shl<i128> for usize

type Output = usize

The resulting type after applying the << operator.

fn shl(self, other: i128) -> usize

Performs the << operation.

impl Shl<u16> for usize

type Output = usize

The resulting type after applying the << operator.

fn shl(self, other: u16) -> usize

Performs the << operation.

impl Shl<i32> for usize

type Output = usize

The resulting type after applying the << operator.

fn shl(self, other: i32) -> usize

Performs the << operation.

impl<'_> Shl<&'_ u64> for usize

type Output = <usize as Shl<u64>>::Output

The resulting type after applying the << operator.

fn shl(self, other: &u64) -> <usize as Shl<u64>>::Output

Performs the << operation.

impl Shl<u64> for usize

type Output = usize

The resulting type after applying the << operator.

fn shl(self, other: u64) -> usize

Performs the << operation.

impl Shl<u8> for usize

type Output = usize

The resulting type after applying the << operator.

fn shl(self, other: u8) -> usize

Performs the << operation.

impl<'_, '_> Shl<&'_ isize> for &'_ usize

type Output = <usize as Shl<isize>>::Output

The resulting type after applying the << operator.

fn shl(self, other: &isize) -> <usize as Shl<isize>>::Output

Performs the << operation.

impl Shl<i64> for usize

type Output = usize

The resulting type after applying the << operator.

fn shl(self, other: i64) -> usize

Performs the << operation.

impl<'a> Shl<i32> for &'a usize

type Output = <usize as Shl<i32>>::Output

The resulting type after applying the << operator.

fn shl(self, other: i32) -> <usize as Shl<i32>>::Output

Performs the << operation.

impl<'_> Shl<&'_ i8> for usize

type Output = <usize as Shl<i8>>::Output

The resulting type after applying the << operator.

fn shl(self, other: &i8) -> <usize as Shl<i8>>::Output

Performs the << operation.

impl<'a> Shl<i8> for &'a usize

type Output = <usize as Shl<i8>>::Output

The resulting type after applying the << operator.

fn shl(self, other: i8) -> <usize as Shl<i8>>::Output

Performs the << operation.

impl<'a> Shl<u16> for &'a usize

type Output = <usize as Shl<u16>>::Output

The resulting type after applying the << operator.

fn shl(self, other: u16) -> <usize as Shl<u16>>::Output

Performs the << operation.

impl<'_> Shl<&'_ u8> for usize

type Output = <usize as Shl<u8>>::Output

The resulting type after applying the << operator.

fn shl(self, other: &u8) -> <usize as Shl<u8>>::Output

Performs the << operation.

impl<'_, '_> Shl<&'_ u8> for &'_ usize

type Output = <usize as Shl<u8>>::Output

The resulting type after applying the << operator.

fn shl(self, other: &u8) -> <usize as Shl<u8>>::Output

Performs the << operation.

impl<'_> Shl<&'_ usize> for usize

type Output = <usize as Shl<usize>>::Output

The resulting type after applying the << operator.

fn shl(self, other: &usize) -> <usize as Shl<usize>>::Output

Performs the << operation.

impl<'_> Shl<&'_ i64> for usize

type Output = <usize as Shl<i64>>::Output

The resulting type after applying the << operator.

fn shl(self, other: &i64) -> <usize as Shl<i64>>::Output

Performs the << operation.

impl Shl<u128> for usize

type Output = usize

The resulting type after applying the << operator.

fn shl(self, other: u128) -> usize

Performs the << operation.

impl Shl<i16> for usize

type Output = usize

The resulting type after applying the << operator.

fn shl(self, other: i16) -> usize

Performs the << operation.

impl<'_> Shl<&'_ i128> for usize

type Output = <usize as Shl<i128>>::Output

The resulting type after applying the << operator.

fn shl(self, other: &i128) -> <usize as Shl<i128>>::Output

Performs the << operation.

impl<'a> Shl<i64> for &'a usize

type Output = <usize as Shl<i64>>::Output

The resulting type after applying the << operator.

fn shl(self, other: i64) -> <usize as Shl<i64>>::Output

Performs the << operation.

impl<'a> Shl<u128> for &'a usize

type Output = <usize as Shl<u128>>::Output

The resulting type after applying the << operator.

fn shl(self, other: u128) -> <usize as Shl<u128>>::Output

Performs the << operation.

impl<'_> Shl<&'_ i16> for usize

type Output = <usize as Shl<i16>>::Output

The resulting type after applying the << operator.

fn shl(self, other: &i16) -> <usize as Shl<i16>>::Output

Performs the << operation.

impl<'_> Shl<&'_ isize> for usize

type Output = <usize as Shl<isize>>::Output

The resulting type after applying the << operator.

fn shl(self, other: &isize) -> <usize as Shl<isize>>::Output

Performs the << operation.

impl<'_> Shr<&'_ isize> for usize

type Output = <usize as Shr<isize>>::Output

The resulting type after applying the >> operator.

fn shr(self, other: &isize) -> <usize as Shr<isize>>::Output

Performs the >> operation.

impl<'_, '_> Shr<&'_ i8> for &'_ usize

type Output = <usize as Shr<i8>>::Output

The resulting type after applying the >> operator.

fn shr(self, other: &i8) -> <usize as Shr<i8>>::Output

Performs the >> operation.

impl<'a> Shr<u64> for &'a usize

type Output = <usize as Shr<u64>>::Output

The resulting type after applying the >> operator.

fn shr(self, other: u64) -> <usize as Shr<u64>>::Output

Performs the >> operation.

impl Shr<u16> for usize

type Output = usize

The resulting type after applying the >> operator.

fn shr(self, other: u16) -> usize

Performs the >> operation.

impl Shr<i64> for usize

type Output = usize

The resulting type after applying the >> operator.

fn shr(self, other: i64) -> usize

Performs the >> operation.

impl<'a> Shr<i64> for &'a usize

type Output = <usize as Shr<i64>>::Output

The resulting type after applying the >> operator.

fn shr(self, other: i64) -> <usize as Shr<i64>>::Output

Performs the >> operation.

impl Shr<i8> for usize

type Output = usize

The resulting type after applying the >> operator.

fn shr(self, other: i8) -> usize

Performs the >> operation.

impl<'_> Shr<&'_ i8> for usize

type Output = <usize as Shr<i8>>::Output

The resulting type after applying the >> operator.

fn shr(self, other: &i8) -> <usize as Shr<i8>>::Output

Performs the >> operation.

impl<'a> Shr<isize> for &'a usize

type Output = <usize as Shr<isize>>::Output

The resulting type after applying the >> operator.

fn shr(self, other: isize) -> <usize as Shr<isize>>::Output

Performs the >> operation.

impl<'_, '_> Shr<&'_ u128> for &'_ usize

type Output = <usize as Shr<u128>>::Output

The resulting type after applying the >> operator.

fn shr(self, other: &u128) -> <usize as Shr<u128>>::Output

Performs the >> operation.

impl<'_, '_> Shr<&'_ i16> for &'_ usize

type Output = <usize as Shr<i16>>::Output

The resulting type after applying the >> operator.

fn shr(self, other: &i16) -> <usize as Shr<i16>>::Output

Performs the >> operation.

impl<'_> Shr<&'_ u128> for usize

type Output = <usize as Shr<u128>>::Output

The resulting type after applying the >> operator.

fn shr(self, other: &u128) -> <usize as Shr<u128>>::Output

Performs the >> operation.

impl<'a> Shr<u8> for &'a usize

type Output = <usize as Shr<u8>>::Output

The resulting type after applying the >> operator.

fn shr(self, other: u8) -> <usize as Shr<u8>>::Output

Performs the >> operation.

impl<'_> Shr<&'_ i64> for usize

type Output = <usize as Shr<i64>>::Output

The resulting type after applying the >> operator.

fn shr(self, other: &i64) -> <usize as Shr<i64>>::Output

Performs the >> operation.

impl<'_, '_> Shr<&'_ u8> for &'_ usize

type Output = <usize as Shr<u8>>::Output

The resulting type after applying the >> operator.

fn shr(self, other: &u8) -> <usize as Shr<u8>>::Output

Performs the >> operation.

impl Shr<u128> for usize

type Output = usize

The resulting type after applying the >> operator.

fn shr(self, other: u128) -> usize

Performs the >> operation.

impl Shr<usize> for usize

type Output = usize

The resulting type after applying the >> operator.

fn shr(self, other: usize) -> usize

Performs the >> operation.

impl<'_, '_> Shr<&'_ i128> for &'_ usize

type Output = <usize as Shr<i128>>::Output

The resulting type after applying the >> operator.

fn shr(self, other: &i128) -> <usize as Shr<i128>>::Output

Performs the >> operation.

impl Shr<i32> for usize

type Output = usize

The resulting type after applying the >> operator.

fn shr(self, other: i32) -> usize

Performs the >> operation.

impl<'a> Shr<i8> for &'a usize

type Output = <usize as Shr<i8>>::Output

The resulting type after applying the >> operator.

fn shr(self, other: i8) -> <usize as Shr<i8>>::Output

Performs the >> operation.

impl<'_, '_> Shr<&'_ usize> for &'_ usize

type Output = <usize as Shr<usize>>::Output

The resulting type after applying the >> operator.

fn shr(self, other: &usize) -> <usize as Shr<usize>>::Output

Performs the >> operation.

impl<'a> Shr<i16> for &'a usize

type Output = <usize as Shr<i16>>::Output

The resulting type after applying the >> operator.

fn shr(self, other: i16) -> <usize as Shr<i16>>::Output

Performs the >> operation.

impl<'_> Shr<&'_ u64> for usize

type Output = <usize as Shr<u64>>::Output

The resulting type after applying the >> operator.

fn shr(self, other: &u64) -> <usize as Shr<u64>>::Output

Performs the >> operation.

impl Shr<i128> for usize

type Output = usize

The resulting type after applying the >> operator.

fn shr(self, other: i128) -> usize

Performs the >> operation.

impl<'_> Shr<&'_ u16> for usize

type Output = <usize as Shr<u16>>::Output

The resulting type after applying the >> operator.

fn shr(self, other: &u16) -> <usize as Shr<u16>>::Output

Performs the >> operation.

impl<'a> Shr<usize> for &'a usize

type Output = <usize as Shr<usize>>::Output

The resulting type after applying the >> operator.

fn shr(self, other: usize) -> <usize as Shr<usize>>::Output

Performs the >> operation.

impl<'_> Shr<&'_ u8> for usize

type Output = <usize as Shr<u8>>::Output

The resulting type after applying the >> operator.

fn shr(self, other: &u8) -> <usize as Shr<u8>>::Output

Performs the >> operation.

impl<'_, '_> Shr<&'_ u32> for &'_ usize

type Output = <usize as Shr<u32>>::Output

The resulting type after applying the >> operator.

fn shr(self, other: &u32) -> <usize as Shr<u32>>::Output

Performs the >> operation.

impl Shr<u32> for usize

type Output = usize

The resulting type after applying the >> operator.

fn shr(self, other: u32) -> usize

Performs the >> operation.

impl Shr<i16> for usize

type Output = usize

The resulting type after applying the >> operator.

fn shr(self, other: i16) -> usize

Performs the >> operation.

impl<'a> Shr<i128> for &'a usize

type Output = <usize as Shr<i128>>::Output

The resulting type after applying the >> operator.

fn shr(self, other: i128) -> <usize as Shr<i128>>::Output

Performs the >> operation.

impl<'_, '_> Shr<&'_ u16> for &'_ usize

type Output = <usize as Shr<u16>>::Output

The resulting type after applying the >> operator.

fn shr(self, other: &u16) -> <usize as Shr<u16>>::Output

Performs the >> operation.

impl Shr<u64> for usize

type Output = usize

The resulting type after applying the >> operator.

fn shr(self, other: u64) -> usize

Performs the >> operation.

impl<'_> Shr<&'_ i32> for usize

type Output = <usize as Shr<i32>>::Output

The resulting type after applying the >> operator.

fn shr(self, other: &i32) -> <usize as Shr<i32>>::Output

Performs the >> operation.

impl<'_, '_> Shr<&'_ u64> for &'_ usize

type Output = <usize as Shr<u64>>::Output

The resulting type after applying the >> operator.

fn shr(self, other: &u64) -> <usize as Shr<u64>>::Output

Performs the >> operation.

impl<'_> Shr<&'_ u32> for usize

type Output = <usize as Shr<u32>>::Output

The resulting type after applying the >> operator.

fn shr(self, other: &u32) -> <usize as Shr<u32>>::Output

Performs the >> operation.

impl<'a> Shr<i32> for &'a usize

type Output = <usize as Shr<i32>>::Output

The resulting type after applying the >> operator.

fn shr(self, other: i32) -> <usize as Shr<i32>>::Output

Performs the >> operation.

impl<'_> Shr<&'_ usize> for usize

type Output = <usize as Shr<usize>>::Output

The resulting type after applying the >> operator.

fn shr(self, other: &usize) -> <usize as Shr<usize>>::Output

Performs the >> operation.

impl<'a> Shr<u16> for &'a usize

type Output = <usize as Shr<u16>>::Output

The resulting type after applying the >> operator.

fn shr(self, other: u16) -> <usize as Shr<u16>>::Output

Performs the >> operation.

impl<'_> Shr<&'_ i128> for usize

type Output = <usize as Shr<i128>>::Output

The resulting type after applying the >> operator.

fn shr(self, other: &i128) -> <usize as Shr<i128>>::Output

Performs the >> operation.

impl Shr<isize> for usize

type Output = usize

The resulting type after applying the >> operator.

fn shr(self, other: isize) -> usize

Performs the >> operation.

impl<'_> Shr<&'_ i16> for usize

type Output = <usize as Shr<i16>>::Output

The resulting type after applying the >> operator.

fn shr(self, other: &i16) -> <usize as Shr<i16>>::Output

Performs the >> operation.

impl<'a> Shr<u128> for &'a usize

type Output = <usize as Shr<u128>>::Output

The resulting type after applying the >> operator.

fn shr(self, other: u128) -> <usize as Shr<u128>>::Output

Performs the >> operation.

impl<'_, '_> Shr<&'_ i64> for &'_ usize

type Output = <usize as Shr<i64>>::Output

The resulting type after applying the >> operator.

fn shr(self, other: &i64) -> <usize as Shr<i64>>::Output

Performs the >> operation.

impl<'_, '_> Shr<&'_ isize> for &'_ usize

type Output = <usize as Shr<isize>>::Output

The resulting type after applying the >> operator.

fn shr(self, other: &isize) -> <usize as Shr<isize>>::Output

Performs the >> operation.

impl<'a> Shr<u32> for &'a usize

type Output = <usize as Shr<u32>>::Output

The resulting type after applying the >> operator.

fn shr(self, other: u32) -> <usize as Shr<u32>>::Output

Performs the >> operation.

impl<'_, '_> Shr<&'_ i32> for &'_ usize

type Output = <usize as Shr<i32>>::Output

The resulting type after applying the >> operator.

fn shr(self, other: &i32) -> <usize as Shr<i32>>::Output

Performs the >> operation.

impl Shr<u8> for usize

type Output = usize

The resulting type after applying the >> operator.

fn shr(self, other: u8) -> usize

Performs the >> operation.

impl<'_> Add<&'_ usize> for usize

type Output = <usize as Add<usize>>::Output

The resulting type after applying the + operator.

fn add(self, other: &usize) -> <usize as Add<usize>>::Output

Performs the + operation.

impl<'a> Add<usize> for &'a usize

type Output = <usize as Add<usize>>::Output

The resulting type after applying the + operator.

fn add(self, other: usize) -> <usize as Add<usize>>::Output

Performs the + operation.

impl<'_, '_> Add<&'_ usize> for &'_ usize

type Output = <usize as Add<usize>>::Output

The resulting type after applying the + operator.

fn add(self, other: &usize) -> <usize as Add<usize>>::Output

Performs the + operation.

impl Add<usize> for usize

type Output = usize

The resulting type after applying the + operator.

fn add(self, other: usize) -> usize

Performs the + operation.

impl<'_> RemAssign<&'_ usize> for usize

fn rem_assign(&mut self, other: &usize)

Performs the %= operation.

impl RemAssign<usize> for usize

fn rem_assign(&mut self, other: usize)

Performs the %= operation.

impl SubAssign<usize> for usize

fn sub_assign(&mut self, other: usize)

Performs the -= operation.

impl<'_> SubAssign<&'_ usize> for usize

fn sub_assign(&mut self, other: &usize)

Performs the -= operation.

impl From<bool> for usize

Converts a bool to a usize. The resulting value is 0 for false and 1 for true values.

Examples

assert_eq!(usize::from(true), 1);
assert_eq!(usize::from(false), 0);

fn from(small: bool) -> usize

Performs the conversion.

impl From<u16> for usize

Converts u16 to usize losslessly.

fn from(small: u16) -> usize

Performs the conversion.

impl From<NonZeroUsize> for usize

fn from(nonzero: NonZeroUsize) -> usize

Performs the conversion.

impl From<u8> for usize

Converts u8 to usize losslessly.

fn from(small: u8) -> usize

Performs the conversion.

impl Ord for usize

fn cmp(&self, other: &usize) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

🔬 This is a nightly-only experimental API. (clamp #44095)

Restrict a value to a certain interval.

impl BitXor<usize> for usize

type Output = usize

The resulting type after applying the ^ operator.

fn bitxor(self, other: usize) -> usize

Performs the ^ operation.

impl<'_, '_> BitXor<&'_ usize> for &'_ usize

type Output = <usize as BitXor<usize>>::Output

The resulting type after applying the ^ operator.

fn bitxor(self, other: &usize) -> <usize as BitXor<usize>>::Output

Performs the ^ operation.

impl<'a> BitXor<usize> for &'a usize

type Output = <usize as BitXor<usize>>::Output

The resulting type after applying the ^ operator.

fn bitxor(self, other: usize) -> <usize as BitXor<usize>>::Output

Performs the ^ operation.

impl<'_> BitXor<&'_ usize> for usize

type Output = <usize as BitXor<usize>>::Output

The resulting type after applying the ^ operator.

fn bitxor(self, other: &usize) -> <usize as BitXor<usize>>::Output

Performs the ^ operation.

impl Binary for usize

fn fmt(&self, f: &mut Formatter) -> Result<(), Error>

Formats the value using the given formatter.

impl Clone for usize

fn clone(&self) -> usize

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl TryFrom<i32> for usize

type Error = TryFromIntError

The type returned in the event of a conversion error.

fn try_from(u: i32) -> Result<usize, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<u64> for usize

type Error = TryFromIntError

The type returned in the event of a conversion error.

fn try_from(value: u64) -> Result<usize, <usize as TryFrom<u64>>::Error>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<i64> for usize

type Error = TryFromIntError

The type returned in the event of a conversion error.

fn try_from(u: i64) -> Result<usize, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<u128> for usize

type Error = TryFromIntError

The type returned in the event of a conversion error.

fn try_from(u: u128) -> Result<usize, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<i128> for usize

type Error = TryFromIntError

The type returned in the event of a conversion error.

fn try_from(u: i128) -> Result<usize, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<isize> for usize

type Error = TryFromIntError

The type returned in the event of a conversion error.

fn try_from(u: isize) -> Result<usize, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<u32> for usize

type Error = TryFromIntError

The type returned in the event of a conversion error.

fn try_from(value: u32) -> Result<usize, <usize as TryFrom<u32>>::Error>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<i16> for usize

type Error = TryFromIntError

The type returned in the event of a conversion error.

fn try_from(u: i16) -> Result<usize, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl TryFrom<i8> for usize

type Error = TryFromIntError

The type returned in the event of a conversion error.

fn try_from(u: i8) -> Result<usize, TryFromIntError>

Try to create the target number type from a source number type. This returns an error if the source value is outside of the range of the target type.

impl Product<usize> for usize

fn product<I>(iter: I) -> usize where
    I: Iterator<Item = usize>, 

Method which takes an iterator and generates Self from the elements by multiplying the items.

impl<'a> Product<&'a usize> for usize

fn product<I>(iter: I) -> usize where
    I: Iterator<Item = &'a usize>, 

Method which takes an iterator and generates Self from the elements by multiplying the items.

impl BitXorAssign<usize> for usize

fn bitxor_assign(&mut self, other: usize)

Performs the ^= operation.

impl<'_> BitXorAssign<&'_ usize> for usize

fn bitxor_assign(&mut self, other: &usize)

Performs the ^= operation.

impl Default for usize

fn default() -> usize

Returns the default value of 0

impl Copy for usize