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Add blanket impls for references to the Fn traits.

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This commit is contained in:
Niko Matsakis 2015-03-20 08:18:04 -04:00
parent cdb10b884b
commit 27b7841bb1
1 changed files with 49 additions and 0 deletions
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49
src/libcore/ops.rs
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@ -1142,3 +1142,52 @@ pub trait FnOnce<Args> {
/// This is called when the call operator is used.
extern "rust-call" fn call_once(self, args: Args) -> Self::Output;
}
#[cfg(not(stage0))]
mod impls {
use marker::Sized;
use super::{Fn, FnMut, FnOnce};
impl<'a,A,F:?Sized> Fn<A> for &'a F
where F : Fn<A>
{
extern "rust-call" fn call(&self, args: A) -> F::Output {
(**self).call(args)
}
}
impl<'a,A,F:?Sized> FnMut<A> for &'a F
where F : Fn<A>
{
extern "rust-call" fn call_mut(&mut self, args: A) -> F::Output {
(**self).call(args)
}
}
impl<'a,A,F:?Sized> FnOnce<A> for &'a F
where F : Fn<A>
{
type Output = F::Output;
extern "rust-call" fn call_once(self, args: A) -> F::Output {
(*self).call(args)
}
}
impl<'a,A,F:?Sized> FnMut<A> for &'a mut F
where F : FnMut<A>
{
extern "rust-call" fn call_mut(&mut self, args: A) -> F::Output {
(*self).call_mut(args)
}
}
impl<'a,A,F:?Sized> FnOnce<A> for &'a mut F
where F : FnMut<A>
{
type Output = F::Output;
extern "rust-call" fn call_once(mut self, args: A) -> F::Output {
(*self).call_mut(args)
}
}
}