Struct hyper::header::ContentLength
[−]
[src]
pub struct ContentLength(pub u64);
Content-Length header, defined in
RFC7230
When a message does not have a Transfer-Encoding header field, a
Content-Length header field can provide the anticipated size, as a
decimal number of octets, for a potential payload body. For messages
that do include a payload body, the Content-Length field-value
provides the framing information necessary for determining where the
body (and message) ends. For messages that do not include a payload
body, the Content-Length indicates the size of the selected
representation.
ABNF
Content-Length = 1*DIGIT
Example values
3495
Example
use hyper::header::{Headers, ContentLength}; let mut headers = Headers::new(); headers.set(ContentLength(1024u64));
Methods from Deref<Target=u64>
1.0.0fn count_ones(self) -> u32
Returns the number of ones in the binary representation of self.
Examples
Basic usage:
let n = 0b01001100u8; assert_eq!(n.count_ones(), 3);
1.0.0fn count_zeros(self) -> u32
Returns the number of zeros in the binary representation of self.
Examples
Basic usage:
let n = 0b01001100u8; assert_eq!(n.count_zeros(), 5);
1.0.0fn leading_zeros(self) -> u32
Returns the number of leading zeros in the binary representation
of self.
Examples
Basic usage:
let n = 0b0101000u16; assert_eq!(n.leading_zeros(), 10);
1.0.0fn trailing_zeros(self) -> u32
Returns the number of trailing zeros in the binary representation
of self.
Examples
Basic usage:
let n = 0b0101000u16; assert_eq!(n.trailing_zeros(), 3);
1.0.0fn rotate_left(self, n: u32) -> u64
Shifts the bits to the left by a specified amount, n,
wrapping the truncated bits to the end of the resulting integer.
Examples
Basic usage:
let n = 0x0123456789ABCDEFu64; let m = 0x3456789ABCDEF012u64; assert_eq!(n.rotate_left(12), m);
1.0.0fn rotate_right(self, n: u32) -> u64
Shifts the bits to the right by a specified amount, n,
wrapping the truncated bits to the beginning of the resulting
integer.
Examples
Basic usage:
let n = 0x0123456789ABCDEFu64; let m = 0xDEF0123456789ABCu64; assert_eq!(n.rotate_right(12), m);
1.0.0fn swap_bytes(self) -> u64
Reverses the byte order of the integer.
Examples
Basic usage:
let n = 0x0123456789ABCDEFu64; let m = 0xEFCDAB8967452301u64; assert_eq!(n.swap_bytes(), m);
1.0.0fn to_be(self) -> u64
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 = 0x0123456789ABCDEFu64; if cfg!(target_endian = "big") { assert_eq!(n.to_be(), n) } else { assert_eq!(n.to_be(), n.swap_bytes()) }
1.0.0fn to_le(self) -> u64
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 = 0x0123456789ABCDEFu64; if cfg!(target_endian = "little") { assert_eq!(n.to_le(), n) } else { assert_eq!(n.to_le(), n.swap_bytes()) }
1.0.0fn checked_add(self, other: u64) -> Option<u64>
Checked integer addition. Computes self + other, returning None
if overflow occurred.
Examples
Basic usage:
assert_eq!(5u16.checked_add(65530), Some(65535)); assert_eq!(6u16.checked_add(65530), None);
1.0.0fn checked_sub(self, other: u64) -> Option<u64>
Checked integer subtraction. Computes self - other, returning
None if underflow occurred.
Examples
Basic usage:
assert_eq!(1u8.checked_sub(1), Some(0)); assert_eq!(0u8.checked_sub(1), None);
1.0.0fn checked_mul(self, other: u64) -> Option<u64>
Checked integer multiplication. Computes self * other, returning
None if underflow or overflow occurred.
Examples
Basic usage:
assert_eq!(5u8.checked_mul(51), Some(255)); assert_eq!(5u8.checked_mul(52), None);
1.0.0fn checked_div(self, other: u64) -> Option<u64>
Checked integer division. Computes self / other, returning None
if other == 0 or the operation results in underflow or overflow.
Examples
Basic usage:
assert_eq!(128u8.checked_div(2), Some(64)); assert_eq!(1u8.checked_div(0), None);
1.7.0fn checked_rem(self, other: u64) -> Option<u64>
Checked integer remainder. Computes self % other, returning None
if other == 0 or the operation results in underflow or overflow.
Examples
Basic usage:
assert_eq!(5u32.checked_rem(2), Some(1)); assert_eq!(5u32.checked_rem(0), None);
1.7.0fn checked_neg(self) -> Option<u64>
Checked negation. Computes -self, returning None unless self == 0.
Note that negating any positive integer will overflow.
Examples
Basic usage:
assert_eq!(0u32.checked_neg(), Some(0)); assert_eq!(1u32.checked_neg(), None);
1.7.0fn checked_shl(self, rhs: u32) -> Option<u64>
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!(0x10u32.checked_shl(4), Some(0x100)); assert_eq!(0x10u32.checked_shl(33), None);
1.7.0fn checked_shr(self, rhs: u32) -> Option<u64>
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!(0x10u32.checked_shr(4), Some(0x1)); assert_eq!(0x10u32.checked_shr(33), None);
1.0.0fn saturating_add(self, other: u64) -> u64
Saturating integer addition. Computes self + other, saturating at
the numeric bounds instead of overflowing.
Examples
Basic usage:
assert_eq!(100u8.saturating_add(1), 101); assert_eq!(200u8.saturating_add(127), 255);
1.0.0fn saturating_sub(self, other: u64) -> u64
Saturating integer subtraction. Computes self - other, saturating
at the numeric bounds instead of overflowing.
Examples
Basic usage:
assert_eq!(100u8.saturating_sub(27), 73); assert_eq!(13u8.saturating_sub(127), 0);
1.7.0fn saturating_mul(self, other: u64) -> u64
Saturating integer multiplication. Computes self * other,
saturating at the numeric bounds instead of overflowing.
Examples
Basic usage:
use std::u32; assert_eq!(100u32.saturating_mul(127), 12700); assert_eq!((1u32 << 23).saturating_mul(1 << 23), u32::MAX);
1.0.0fn wrapping_add(self, rhs: u64) -> u64
Wrapping (modular) addition. Computes self + other,
wrapping around at the boundary of the type.
Examples
Basic usage:
assert_eq!(200u8.wrapping_add(55), 255); assert_eq!(200u8.wrapping_add(155), 99);
1.0.0fn wrapping_sub(self, rhs: u64) -> u64
Wrapping (modular) subtraction. Computes self - other,
wrapping around at the boundary of the type.
Examples
Basic usage:
assert_eq!(100u8.wrapping_sub(100), 0); assert_eq!(100u8.wrapping_sub(155), 201);
1.0.0fn wrapping_mul(self, rhs: u64) -> u64
Wrapping (modular) multiplication. Computes self * other, wrapping around at the boundary of the type.
Examples
Basic usage:
assert_eq!(10u8.wrapping_mul(12), 120); assert_eq!(25u8.wrapping_mul(12), 44);
1.2.0fn wrapping_div(self, rhs: u64) -> u64
Wrapping (modular) division. Computes self / other.
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!(100u8.wrapping_div(10), 10);
1.2.0fn wrapping_rem(self, rhs: u64) -> u64
Wrapping (modular) remainder. Computes self % other.
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!(100i8.wrapping_rem(10), 0);
1.2.0fn wrapping_neg(self) -> u64
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:
assert_eq!(100u8.wrapping_neg(), 156); assert_eq!(0u8.wrapping_neg(), 0); assert_eq!(180u8.wrapping_neg(), 76); assert_eq!(180u8.wrapping_neg(), (127 + 1) - (180u8 - (127 + 1)));
1.2.0fn wrapping_shl(self, rhs: u32) -> u64
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.
Examples
Basic usage:
assert_eq!(1u8.wrapping_shl(7), 128); assert_eq!(1u8.wrapping_shl(8), 1);
1.2.0fn wrapping_shr(self, rhs: u32) -> u64
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.
Examples
Basic usage:
assert_eq!(128u8.wrapping_shr(7), 1); assert_eq!(128u8.wrapping_shr(8), 128);
1.7.0fn overflowing_add(self, rhs: u64) -> (u64, 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::u32; assert_eq!(5u32.overflowing_add(2), (7, false)); assert_eq!(u32::MAX.overflowing_add(1), (0, true));
1.7.0fn overflowing_sub(self, rhs: u64) -> (u64, 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::u32; assert_eq!(5u32.overflowing_sub(2), (3, false)); assert_eq!(0u32.overflowing_sub(1), (u32::MAX, true));
1.7.0fn overflowing_mul(self, rhs: u64) -> (u64, 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
assert_eq!(5u32.overflowing_mul(2), (10, false)); assert_eq!(1_000_000_000u32.overflowing_mul(10), (1410065408, true));
1.7.0fn overflowing_div(self, rhs: u64) -> (u64, 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!(5u32.overflowing_div(2), (2, false));
1.7.0fn overflowing_rem(self, rhs: u64) -> (u64, 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!(5u32.overflowing_rem(2), (1, false));
1.7.0fn overflowing_neg(self) -> (u64, 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!(0u32.overflowing_neg(), (0, false)); assert_eq!(2u32.overflowing_neg(), (-2i32 as u32, true));
1.7.0fn overflowing_shl(self, rhs: u32) -> (u64, 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!(0x10u32.overflowing_shl(4), (0x100, false)); assert_eq!(0x10u32.overflowing_shl(36), (0x100, true));
1.7.0fn overflowing_shr(self, rhs: u32) -> (u64, 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!(0x10u32.overflowing_shr(4), (0x1, false)); assert_eq!(0x10u32.overflowing_shr(36), (0x1, true));
1.0.0fn pow(self, exp: u32) -> u64
Raises self to the power of exp, using exponentiation by squaring.
Examples
Basic usage:
assert_eq!(2u32.pow(4), 16);
1.0.0fn is_power_of_two(self) -> bool
Returns true if and only if self == 2^k for some k.
Examples
Basic usage:
assert!(16u8.is_power_of_two()); assert!(!10u8.is_power_of_two());
1.0.0fn next_power_of_two(self) -> u64
Returns the smallest power of two greater than or equal to self.
Unspecified behavior on overflow.
Examples
Basic usage:
assert_eq!(2u8.next_power_of_two(), 2); assert_eq!(3u8.next_power_of_two(), 4);
1.0.0fn checked_next_power_of_two(self) -> Option<u64>
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!(2u8.checked_next_power_of_two(), Some(2)); assert_eq!(3u8.checked_next_power_of_two(), Some(4)); assert_eq!(200u8.checked_next_power_of_two(), None);