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|
// implements the unary operator "op &T"
// based on "op T" where T is expected to be `Copy`able
macro_rules! forward_ref_unop {
(impl $imp:ident, $method:ident for $t:ty, $(#[$attr:meta])+) => {
$(#[$attr])+
impl const $imp for &$t {
type Output = <$t as $imp>::Output;
#[inline]
fn $method(self) -> <$t as $imp>::Output {
$imp::$method(*self)
}
}
}
}
// implements binary operators "&T op U", "T op &U", "&T op &U"
// based on "T op U" where T and U are expected to be `Copy`able
macro_rules! forward_ref_binop {
(impl $imp:ident, $method:ident for $t:ty, $u:ty, $(#[$attr:meta])+) => {
$(#[$attr])+
impl const $imp<$u> for &$t {
type Output = <$t as $imp<$u>>::Output;
#[inline]
#[track_caller]
fn $method(self, other: $u) -> <$t as $imp<$u>>::Output {
$imp::$method(*self, other)
}
}
$(#[$attr])+
impl const $imp<&$u> for $t {
type Output = <$t as $imp<$u>>::Output;
#[inline]
#[track_caller]
fn $method(self, other: &$u) -> <$t as $imp<$u>>::Output {
$imp::$method(self, *other)
}
}
$(#[$attr])+
impl const $imp<&$u> for &$t {
type Output = <$t as $imp<$u>>::Output;
#[inline]
#[track_caller]
fn $method(self, other: &$u) -> <$t as $imp<$u>>::Output {
$imp::$method(*self, *other)
}
}
}
}
// implements "T op= &U", based on "T op= U"
// where U is expected to be `Copy`able
macro_rules! forward_ref_op_assign {
(impl $imp:ident, $method:ident for $t:ty, $u:ty, $(#[$attr:meta])+) => {
$(#[$attr])+
impl const $imp<&$u> for $t {
#[inline]
#[track_caller]
fn $method(&mut self, other: &$u) {
$imp::$method(self, *other);
}
}
}
}
/// Creates a zero-size type similar to a closure type, but named.
macro_rules! impl_fn_for_zst {
($(
$( #[$attr: meta] )*
struct $Name: ident impl$( <$( $lifetime : lifetime ),+> )? Fn =
|$( $arg: ident: $ArgTy: ty ),*| -> $ReturnTy: ty
$body: block;
)+) => {
$(
$( #[$attr] )*
struct $Name;
impl $( <$( $lifetime ),+> )? Fn<($( $ArgTy, )*)> for $Name {
#[inline]
extern "rust-call" fn call(&self, ($( $arg, )*): ($( $ArgTy, )*)) -> $ReturnTy {
$body
}
}
impl $( <$( $lifetime ),+> )? FnMut<($( $ArgTy, )*)> for $Name {
#[inline]
extern "rust-call" fn call_mut(
&mut self,
($( $arg, )*): ($( $ArgTy, )*)
) -> $ReturnTy {
Fn::call(&*self, ($( $arg, )*))
}
}
impl $( <$( $lifetime ),+> )? FnOnce<($( $ArgTy, )*)> for $Name {
type Output = $ReturnTy;
#[inline]
extern "rust-call" fn call_once(self, ($( $arg, )*): ($( $ArgTy, )*)) -> $ReturnTy {
Fn::call(&self, ($( $arg, )*))
}
}
)+
}
}
|
