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#[doc(hidden)]
macro_rules! __declare_string_cmp_fns {
(
import_path = $path:expr,
equality_fn = $eq_str:ident,
ordering_fn = $cmp_str:ident,
/// Equivalent to ordering_fn, but returns a U8Ordering
ordering_fn_inner = $cmp_str_inner:ident,
) => {
__declare_string_cmp_fns! {
@inner
equality_fn = $eq_str,
ordering_fn = $cmp_str,
use_eq_str = concat!("use ", $path, "::", stringify!($eq_str), ";"),
use_cmp_str = concat!("use ", $path, "::", stringify!($cmp_str), ";"),
}
};
(@inner
equality_fn = $eq_str:ident,
ordering_fn = $cmp_str:ident,
use_eq_str = $eq_str_import:expr,
use_cmp_str = $cmp_str_import:expr,
) => {
__delegate_const_eq! {
skip_coerce;
/// A const equivalent of `&str` equality comparison.
///
/// # Example
///
/// ```rust
#[doc = $eq_str_import]
///
/// const FOO: &str = "foo";
/// const BAR: &str = "fooooo";
/// const BAZ: &str = "bar";
///
///
/// const FOO_EQ_FOO: bool = eq_str(FOO, FOO);
/// assert!( FOO_EQ_FOO );
///
/// const FOO_EQ_BAR: bool = eq_str(FOO, BAR);
/// assert!( !FOO_EQ_BAR );
///
/// const FOO_EQ_BAZ: bool = eq_str(FOO, BAZ);
/// assert!( !FOO_EQ_BAZ );
///
/// ```
///
#[inline]
pub const fn eq_str(ref left: str, right: &str) -> bool {
let left = left.as_bytes();
let right = right.as_bytes();
if left.len() != right.len() {
return false;
}
let mut i = 0;
while i != left.len() {
if left[i] != right[i] {
return false;
}
i += 1;
}
true
}
}
__delegate_const_ord! {
skip_coerce;
/// A const equivalent of `str::cmp`.
///
/// # Example
///
/// ```rust
#[doc = $cmp_str_import]
///
/// use std::cmp::Ordering;
///
/// const FOO: &str = "foo";
/// const BAR: &str = "fooooo";
/// const BAZ: &str = "bar";
///
///
/// const FOO_CMP_FOO: Ordering = cmp_str(FOO, FOO);
/// assert_eq!(FOO_CMP_FOO, Ordering::Equal);
///
/// const FOO_CMP_BAR: Ordering = cmp_str(FOO, BAR);
/// assert_eq!(FOO_CMP_BAR, Ordering::Less);
///
/// const FOO_CMP_BAZ: Ordering = cmp_str(FOO, BAZ);
/// assert_eq!(FOO_CMP_BAZ, Ordering::Greater);
///
/// ```
///
#[inline]
pub const fn cmp_str(ref left: str, right: &str) -> core::cmp::Ordering {
cmp_str_inner(left.as_bytes(), right.as_bytes()).to_ordering()
}
}
#[inline]
const fn cmp_str_inner(left: &[u8], right: &[u8]) -> crate::__::U8Ordering {
use crate::__::U8Ordering;
let left_len = left.len();
let right_len = right.len();
let (min_len, on_ne) = if left_len < right_len {
(left_len, U8Ordering::LESS)
} else {
(right_len, U8Ordering::GREATER)
};
let mut i = 0;
while i < min_len {
crate::__priv_ret_if_ne! {left[i], right[i]}
i += 1;
}
if left_len == right_len {
U8Ordering::EQUAL
} else {
on_ne
}
}
};
}
#[doc(hidden)]
macro_rules! __declare_slice_cmp_fns{
(
import_path = $path:expr,
$((
$(#[$attr_both:meta])*,
$(#[$attr_eq:meta])*,
$(#[$attr_ord:meta])*,
$type:ty,
$eq_fn_name:ident,
$cmp_fn_name:ident,
))*
)=>{
$(
__declare_slice_cmp_fns!{
@step_two
import_path = $path,
$(#[$attr_both])*,
$(#[$attr_eq])*,
$(#[$attr_ord])*,
concat!(
"Compares two `&[",
stringify!($type),
"]` for equality.",
),
concat!(
"Compares two `&[",
stringify!($type),
"]`, returning the order of `left` relative to `right`.",
),
$type,
$eq_fn_name,
$cmp_fn_name,
}
)*
};
(@step_two
import_path = $path:expr,
$(#[$attr_both:meta])*,
$(#[$attr_eq:meta])*,
$(#[$attr_ord:meta])*,
$docs_eq:expr,
$docs_ord:expr,
$ty:ty,
$eq_fn_name:ident,
$cmp_fn_name:ident,
) => {
__delegate_const_eq!{
skip_coerce;
#[doc = $docs_eq]
$(#[$attr_both])*
$(#[$attr_eq])*
#[inline]
pub const fn $eq_fn_name(ref left: [$ty], right: &[$ty]) -> bool {
if left.len() != right.len() {
return false;
}
let mut i = 0;
while i != left.len() {
if left[i] != right[i] {
return false;
}
i += 1;
}
true
}
}
#[cfg(feature = "cmp")]
impl<const N: usize> crate::cmp::CmpWrapper<[$ty; N]> {
/// Compares array with slice for equaity
pub const fn const_eq(&self, other: &[$ty]) -> bool {
let this: &crate::cmp::CmpWrapper<[$ty]> = self;
this.const_eq(other)
}
/// Compares array with slice for ordering
pub const fn const_cmp(&self, other: &[$ty]) -> core::cmp::Ordering {
let this: &crate::cmp::CmpWrapper<[$ty]> = self;
this.const_cmp(other)
}
}
__delegate_const_ord!{
skip_coerce;
#[doc = $docs_ord]
$(#[$attr_both])*
$(#[$attr_ord])*
#[inline]
pub const fn $cmp_fn_name(ref left: [$ty], right: &[$ty]) -> core::cmp::Ordering {
use crate::__::U8Ordering;
const fn cmp_inner(left: &[$ty], right: &[$ty]) -> crate::__::U8Ordering {
let left_len = left.len();
let right_len = right.len();
let min_len = if left_len < right_len { left_len } else { right_len };
let mut i = 0;
while i < min_len {
crate::__priv_ret_if_ne! {left[i], right[i]}
i += 1;
}
crate::__priv_ret_if_ne! {left_len, right.len()}
U8Ordering::EQUAL
}
cmp_inner(left, right).to_ordering()
}
}
};
}
#[doc(hidden)]
macro_rules! __declare_fns_with_docs{
(
$(($($args:tt)*))*
docs $docs:tt
macro = $macro:ident ! $macro_prefix:tt,
)=>{
$(
__declare_fns_with_docs!{
@inner
($($args)*)
docs $docs
macro = $macro ! $macro_prefix,
}
)*
};
(@inner
(
$type:ty,
($($func_name:ident),* $(,)?)
$($rem:tt)*
)
docs(
$(($before:expr, $after:expr))*
)
macro = $macro:ident ! ($($prefix:tt)*),
) => {
$macro!{
$($prefix)*
($type, ($($func_name),*) $($rem)* )
docs(
$(concat!($before, stringify!($type), $after)),*
)
}
};
(@inner
(
$type:ty,
($($func_name:ident),* $(,)?)
$($rem:tt)*
)
docs(default)
macro = $macro:ident ! ($($prefix:tt)*),
) => {
$macro!{
$($prefix)*
($type, ($($func_name),*) $($rem)* )
docs(
concat!(
"Compares two `",
stringify!($type),
"` for equality.",
),
concat!(
"Compares two `",
stringify!($type),
"`, returning the ordering of `left` relative to `right`."
),
)
}
};
}
macro_rules! __impl_option_cmp_fns {
(
$(#[$attr:meta])*
$(for[$($impl:tt)*])?
params($l:ident, $r:ident)
eq_comparison = $eq_comparison:expr,
cmp_comparison = $cmp_comparison:expr,
parameter_copyability = $copyab:ident,
($type:ty, ($eq_fn_name:ident, $cmp_fn_name:ident))
docs( $docs_eq:expr, $docs_cmp:expr, )
) => (
__delegate_const_eq!{
$(for[$($impl)*])?
#[doc = $docs_eq]
$(#[$attr])*
pub const fn $eq_fn_name($copyab left: $type, right: $type) -> bool {
match (left, right) {
(Some($l), Some($r)) => $eq_comparison,
(None, None) => true,
_ => false,
}
}
}
__delegate_const_ord!{
$(for[$($impl)*])?
#[doc = $docs_cmp]
$(#[$attr])*
pub const fn $cmp_fn_name($copyab left: $type, right: $type) -> core::cmp::Ordering {
use core::cmp::Ordering;
match (left, right) {
(Some($l), Some($r)) => $cmp_comparison,
(Some(_), None) => Ordering::Greater,
(None, Some(_)) => Ordering::Less,
(None, None) => Ordering::Equal,
}
}
}
)
}