120 lines
3.7 KiB
Rust
120 lines
3.7 KiB
Rust
// implements the unary operator "op &T"
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// based on "op T" where T is expected to be `Copy`able
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macro_rules! forward_ref_unop {
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(impl $imp:ident, $method:ident for $t:ty) => {
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forward_ref_unop!(impl $imp, $method for $t,
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#[stable(feature = "rust1", since = "1.0.0")]);
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};
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(impl $imp:ident, $method:ident for $t:ty, #[$attr:meta]) => {
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#[$attr]
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impl $imp for &$t {
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type Output = <$t as $imp>::Output;
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#[inline]
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fn $method(self) -> <$t as $imp>::Output {
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$imp::$method(*self)
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}
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}
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}
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}
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// implements binary operators "&T op U", "T op &U", "&T op &U"
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// based on "T op U" where T and U are expected to be `Copy`able
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macro_rules! forward_ref_binop {
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(impl $imp:ident, $method:ident for $t:ty, $u:ty) => {
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forward_ref_binop!(impl $imp, $method for $t, $u,
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#[stable(feature = "rust1", since = "1.0.0")]);
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};
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(impl $imp:ident, $method:ident for $t:ty, $u:ty, #[$attr:meta]) => {
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#[$attr]
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impl<'a> $imp<$u> for &'a $t {
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type Output = <$t as $imp<$u>>::Output;
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#[inline]
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fn $method(self, other: $u) -> <$t as $imp<$u>>::Output {
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$imp::$method(*self, other)
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}
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}
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#[$attr]
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impl $imp<&$u> for $t {
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type Output = <$t as $imp<$u>>::Output;
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#[inline]
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fn $method(self, other: &$u) -> <$t as $imp<$u>>::Output {
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$imp::$method(self, *other)
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}
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}
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#[$attr]
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impl $imp<&$u> for &$t {
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type Output = <$t as $imp<$u>>::Output;
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#[inline]
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fn $method(self, other: &$u) -> <$t as $imp<$u>>::Output {
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$imp::$method(*self, *other)
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}
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}
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}
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}
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// implements "T op= &U", based on "T op= U"
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// where U is expected to be `Copy`able
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macro_rules! forward_ref_op_assign {
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(impl $imp:ident, $method:ident for $t:ty, $u:ty) => {
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forward_ref_op_assign!(impl $imp, $method for $t, $u,
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#[stable(feature = "op_assign_builtins_by_ref", since = "1.22.0")]);
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};
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(impl $imp:ident, $method:ident for $t:ty, $u:ty, #[$attr:meta]) => {
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#[$attr]
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impl $imp<&$u> for $t {
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#[inline]
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fn $method(&mut self, other: &$u) {
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$imp::$method(self, *other);
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}
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}
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}
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}
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/// Create a zero-size type similar to a closure type, but named.
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#[unstable(feature = "std_internals", issue = "none")]
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macro_rules! impl_fn_for_zst {
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($(
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$( #[$attr: meta] )*
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struct $Name: ident impl$( <$( $lifetime : lifetime ),+> )? Fn =
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|$( $arg: ident: $ArgTy: ty ),*| -> $ReturnTy: ty
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$body: block;
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)+) => {
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$(
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$( #[$attr] )*
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struct $Name;
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impl $( <$( $lifetime ),+> )? Fn<($( $ArgTy, )*)> for $Name {
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#[inline]
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extern "rust-call" fn call(&self, ($( $arg, )*): ($( $ArgTy, )*)) -> $ReturnTy {
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$body
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}
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}
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impl $( <$( $lifetime ),+> )? FnMut<($( $ArgTy, )*)> for $Name {
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#[inline]
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extern "rust-call" fn call_mut(
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&mut self,
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($( $arg, )*): ($( $ArgTy, )*)
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) -> $ReturnTy {
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Fn::call(&*self, ($( $arg, )*))
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}
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}
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impl $( <$( $lifetime ),+> )? FnOnce<($( $ArgTy, )*)> for $Name {
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type Output = $ReturnTy;
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#[inline]
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extern "rust-call" fn call_once(self, ($( $arg, )*): ($( $ArgTy, )*)) -> $ReturnTy {
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Fn::call(&self, ($( $arg, )*))
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}
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}
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)+
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}
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}
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