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Add individual documentation for <integer>.swap_bytes/.reverse_bits
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@llogiq
llogiq committed Aug 10, 2018
1 parent f6d43ed commit 945f032
Showing 1 changed file with 112 additions and 113 deletions.
225 changes: 112 additions & 113 deletions src/libcore/num/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -188,7 +188,8 @@ mod wrapping;
// `Int` + `SignedInt` implemented for signed integers
macro_rules! int_impl {
($SelfT:ty, $ActualT:ident, $UnsignedT:ty, $BITS:expr, $Min:expr, $Max:expr, $Feature:expr,
$EndFeature:expr, $rot:expr, $rot_op:expr, $rot_result:expr) => {
$EndFeature:expr, $rot:expr, $rot_op:expr, $rot_result:expr, $swap_op:expr, $swapped:expr,
$reversed:expr) => {
doc_comment! {
concat!("Returns the smallest value that can be represented by this integer type.
Expand Down Expand Up @@ -380,55 +381,48 @@ assert_eq!(n.rotate_right(", $rot, "), m);
(self as $UnsignedT).rotate_right(n) as Self
}
}
/// Reverses the byte order of the integer.
///
/// # Examples
///
/// Please note that this example is shared between integer types.
/// Which explains why `i16` is used here.
///
/// Basic usage:
///
/// ```
/// let n: i16 = 0b0000000_01010101;
/// assert_eq!(n, 85);
///
/// let m = n.swap_bytes();
///
/// assert_eq!(m, 0b01010101_00000000);
/// assert_eq!(m, 21760);
/// ```
#[stable(feature = "rust1", since = "1.0.0")]
#[rustc_const_unstable(feature = "const_int_ops")]
#[inline]
pub const fn swap_bytes(self) -> Self {
(self as $UnsignedT).swap_bytes() as Self
doc_comment! {
concat!("Reverses the byte order of the integer.
# Examples
Basic usage:
```
let n = ", $swap_op, stringify!($SelfT), ";
let m = n.swap_bytes();
assert_eq!(m, ", $swapped, ");
```"),
#[stable(feature = "rust1", since = "1.0.0")]
#[rustc_const_unstable(feature = "const_int_ops")]
#[inline]
pub const fn swap_bytes(self) -> Self {
(self as $UnsignedT).swap_bytes() as Self
}
}

/// Reverses the bit pattern of the integer.
///
/// # Examples
///
/// Please note that this example is shared between integer types.
/// Which explains why `i16` is used here.
///
/// Basic usage:
///
/// ```
/// #![feature(reverse_bits)]
///
/// let n: i16 = 0b0000000_01010101;
/// assert_eq!(n, 85);
///
/// let m = n.reverse_bits();
///
/// assert_eq!(m as u16, 0b10101010_00000000);
/// assert_eq!(m, -22016);
/// ```
#[unstable(feature = "reverse_bits", issue = "48763")]
#[inline]
pub fn reverse_bits(self) -> Self {
(self as $UnsignedT).reverse_bits() as Self
doc_comment! {
concat!("Reverses the bit pattern of the integer.
# Examples
Basic usage:
```
#![feature(reverse_bits)]
let n = ", $swap_op, stringify!($SelfT), ";
let m = n.reverse_bits();
assert_eq!(m, ", $reversed, ");
```"),
#[unstable(feature = "reverse_bits", issue = "48763")]
#[inline]
pub fn reverse_bits(self) -> Self {
(self as $UnsignedT).reverse_bits() as Self
}
}

doc_comment! {
Expand Down Expand Up @@ -2009,50 +2003,57 @@ $EndFeature, "

#[lang = "i8"]
impl i8 {
int_impl! { i8, i8, u8, 8, -128, 127, "", "", 2, "-0x7e", "0xa" }
int_impl! { i8, i8, u8, 8, -128, 127, "", "", 2, "-0x7e", "0xa", "0x12", "0x12", "0x48" }
}

#[lang = "i16"]
impl i16 {
int_impl! { i16, i16, u16, 16, -32768, 32767, "", "", 4, "-0x5ffd", "0x3a" }
int_impl! { i16, i16, u16, 16, -32768, 32767, "", "", 4, "-0x5ffd", "0x3a", "0x1234", "0x3412",
"0x2c48" }
}

#[lang = "i32"]
impl i32 {
int_impl! { i32, i32, u32, 32, -2147483648, 2147483647, "", "", 8, "0x10000b3", "0xb301" }
int_impl! { i32, i32, u32, 32, -2147483648, 2147483647, "", "", 8, "0x10000b3", "0xb301",
"0x12345678", "0x78563412", "0x1e6a2c48" }
}

#[lang = "i64"]
impl i64 {
int_impl! { i64, i64, u64, 64, -9223372036854775808, 9223372036854775807, "", "", 12,
"0xaa00000000006e1", "0x6e10aa" }
"0xaa00000000006e1", "0x6e10aa", "0x1234567890123456", "0x5634129078563412",
"0x6a2c48091e6a2c48" }
}

#[lang = "i128"]
impl i128 {
int_impl! { i128, i128, u128, 128, -170141183460469231731687303715884105728,
170141183460469231731687303715884105727, "", "", 16,
"0x13f40000000000000000000000004f76", "0x4f7613f4"
"0x13f40000000000000000000000004f76", "0x4f7613f4", "0x12345678901234567890123456789012",
"0x12907856341290785634129078563412", "0x48091e6a2c48091e6a2c48091e6a2c48"
}
}

#[cfg(target_pointer_width = "16")]
#[lang = "isize"]
impl isize {
int_impl! { isize, i16, u16, 16, -32768, 32767, "", "", 4, "-0x5ffd", "0x3a" }
int_impl! { isize, i16, u16, 16, -32768, 32767, "", "", 4, "-0x5ffd", "0x3a", "0x1234",
"0x3412", "0x2c48" }
}

#[cfg(target_pointer_width = "32")]
#[lang = "isize"]
impl isize {
int_impl! { isize, i32, u32, 32, -2147483648, 2147483647, "", "", 8, "0x10000b3", "0xb301" }
int_impl! { isize, i32, u32, 32, -2147483648, 2147483647, "", "", 8, "0x10000b3", "0xb301",
"0x12345678", "0x78563412", "0x1e6a2c48" }
}

#[cfg(target_pointer_width = "64")]
#[lang = "isize"]
impl isize {
int_impl! { isize, i64, u64, 64, -9223372036854775808, 9223372036854775807, "", "",
12, "0xaa00000000006e1", "0x6e10aa" }
12, "0xaa00000000006e1", "0x6e10aa", "0x1234567890123456", "0x5634129078563412",
"0x6a2c48091e6a2c48" }
}

// Emits the correct `cttz` call, depending on the size of the type.
Expand All @@ -2071,7 +2072,8 @@ macro_rules! uint_cttz_call {
// `Int` + `UnsignedInt` implemented for unsigned integers
macro_rules! uint_impl {
($SelfT:ty, $ActualT:ty, $BITS:expr, $MaxV:expr, $Feature:expr, $EndFeature:expr,
$rot:expr, $rot_op:expr, $rot_result:expr) => {
$rot:expr, $rot_op:expr, $rot_result:expr, $swap_op:expr, $swapped:expr,
$reversed:expr ) => {
doc_comment! {
concat!("Returns the smallest value that can be represented by this integer type.
Expand Down Expand Up @@ -2263,55 +2265,48 @@ assert_eq!(n.rotate_right(", $rot, "), m);
}
}

/// Reverses the byte order of the integer.
///
/// # Examples
///
/// Basic usage:
///
/// Please note that this example is shared between integer types.
/// Which explains why `u16` is used here.
///
/// ```
/// let n: u16 = 0b0000000_01010101;
/// assert_eq!(n, 85);
///
/// let m = n.swap_bytes();
///
/// assert_eq!(m, 0b01010101_00000000);
/// assert_eq!(m, 21760);
/// ```
#[stable(feature = "rust1", since = "1.0.0")]
#[rustc_const_unstable(feature = "const_int_ops")]
#[inline]
pub const fn swap_bytes(self) -> Self {
unsafe { intrinsics::bswap(self as $ActualT) as Self }
doc_comment! {
concat!("
Reverses the byte order of the integer.
# Examples
Basic usage:
```
let n = ", $swap_op, stringify!($SelfT), ";
let m = n.swap_bytes();
assert_eq!(m, ", $swapped, ");
```"),
#[stable(feature = "rust1", since = "1.0.0")]
#[rustc_const_unstable(feature = "const_int_ops")]
#[inline]
pub const fn swap_bytes(self) -> Self {
unsafe { intrinsics::bswap(self as $ActualT) as Self }
}
}

/// Reverses the bit pattern of the integer.
///
/// # Examples
///
/// Basic usage:
///
/// Please note that this example is shared between integer types.
/// Which explains why `u16` is used here.
///
/// ```
/// #![feature(reverse_bits)]
///
/// let n: u16 = 0b0000000_01010101;
/// assert_eq!(n, 85);
///
/// let m = n.reverse_bits();
///
/// assert_eq!(m, 0b10101010_00000000);
/// assert_eq!(m, 43520);
/// ```
#[unstable(feature = "reverse_bits", issue = "48763")]
#[inline]
pub fn reverse_bits(self) -> Self {
unsafe { intrinsics::bitreverse(self as $ActualT) as Self }
doc_comment! {
concat!("Reverses the bit pattern of the integer.
# Examples
Basic usage:
```
#![feature(reverse_bits)]
let n = ", $swap_op, stringify!($SelfT), ";
let m = n.reverse_bits();
assert_eq!(m, ", $reversed, ");
```"),
#[unstable(feature = "reverse_bits", issue = "48763")]
#[inline]
pub fn reverse_bits(self) -> Self {
unsafe { intrinsics::bitreverse(self as $ActualT) as Self }
}
}

doc_comment! {
Expand Down Expand Up @@ -3621,7 +3616,7 @@ $EndFeature, "

#[lang = "u8"]
impl u8 {
uint_impl! { u8, u8, 8, 255, "", "", 2, "0x82", "0xa" }
uint_impl! { u8, u8, 8, 255, "", "", 2, "0x82", "0xa", "0x12", "0x12", "0x48" }


/// Checks if the value is within the ASCII range.
Expand Down Expand Up @@ -4147,41 +4142,45 @@ impl u8 {

#[lang = "u16"]
impl u16 {
uint_impl! { u16, u16, 16, 65535, "", "", 4, "0xa003", "0x3a" }
uint_impl! { u16, u16, 16, 65535, "", "", 4, "0xa003", "0x3a", "0x1234", "0x3412", "0x2c48" }
}

#[lang = "u32"]
impl u32 {
uint_impl! { u32, u32, 32, 4294967295, "", "", 8, "0x10000b3", "0xb301" }
uint_impl! { u32, u32, 32, 4294967295, "", "", 8, "0x10000b3", "0xb301", "0x12345678",
"0x78563412", "0x1e6a2c48" }
}

#[lang = "u64"]
impl u64 {
uint_impl! { u64, u64, 64, 18446744073709551615, "", "", 12, "0xaa00000000006e1", "0x6e10aa" }
uint_impl! { u64, u64, 64, 18446744073709551615, "", "", 12, "0xaa00000000006e1", "0x6e10aa",
"0x1234567890123456", "0x5634129078563412", "0x6a2c48091e6a2c48" }
}

#[lang = "u128"]
impl u128 {
uint_impl! { u128, u128, 128, 340282366920938463463374607431768211455, "", "", 16,
"0x13f40000000000000000000000004f76", "0x4f7613f4" }
"0x13f40000000000000000000000004f76", "0x4f7613f4", "0x12345678901234567890123456789012",
"0x12907856341290785634129078563412", "0x48091e6a2c48091e6a2c48091e6a2c48" }
}

#[cfg(target_pointer_width = "16")]
#[lang = "usize"]
impl usize {
uint_impl! { usize, u16, 16, 65536, "", "", 4, "0xa003", "0x3a" }
uint_impl! { usize, u16, 16, 65536, "", "", 4, "0xa003", "0x3a", "0x1234", "0x3412", "0x2c48" }
}
#[cfg(target_pointer_width = "32")]
#[lang = "usize"]
impl usize {
uint_impl! { usize, u32, 32, 4294967295, "", "", 8, "0x10000b3", "0xb301" }
uint_impl! { usize, u32, 32, 4294967295, "", "", 8, "0x10000b3", "0xb301", "0x12345678",
"0x78563412", "0x1e6a2c48" }
}

#[cfg(target_pointer_width = "64")]
#[lang = "usize"]
impl usize {
uint_impl! { usize, u64, 64, 18446744073709551615, "", "", 12, "0xaa00000000006e1",
"0x6e10aa" }
uint_impl! { usize, u64, 64, 18446744073709551615, "", "", 12, "0xaa00000000006e1", "0x6e10aa",
"0x1234567890123456", "0x5634129078563412", "0x6a2c48091e6a2c48" }
}

/// A classification of floating point numbers.
Expand Down

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