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Add a finally impl for extern "Rust" fn()

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This commit is contained in:
Alex Crichton 2013-06-10 23:13:04 -07:00
parent d0b1979004
commit 305f5110a7
1 changed files with 18 additions and 24 deletions
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42
src/libstd/unstable/finally.rs
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@ -31,6 +31,19 @@ pub trait Finally<T> {
fn finally(&self, dtor: &fn()) -> T;
}
macro_rules! finally_fn {
($fnty:ty) => {
impl<T> Finally<T> for $fnty {
fn finally(&self, dtor: &fn()) -> T {
let _d = Finallyalizer {
dtor: dtor
};
(*self)()
}
}
}
}
impl<'self,T> Finally<T> for &'self fn() -> T {
fn finally(&self, dtor: &fn()) -> T {
let _d = Finallyalizer {
@ -41,25 +54,9 @@ impl<'self,T> Finally<T> for &'self fn() -> T {
}
}
impl<T> Finally<T> for ~fn() -> T {
fn finally(&self, dtor: &fn()) -> T {
let _d = Finallyalizer {
dtor: dtor
};
(*self)()
}
}
impl<T> Finally<T> for @fn() -> T {
fn finally(&self, dtor: &fn()) -> T {
let _d = Finallyalizer {
dtor: dtor
};
(*self)()
}
}
finally_fn!(~fn() -> T)
finally_fn!(@fn() -> T)
finally_fn!(extern "Rust" fn() -> T)
struct Finallyalizer<'self> {
dtor: &'self fn()
@ -108,10 +105,7 @@ fn test_retval() {
#[test]
fn test_compact() {
// FIXME #4727: Should be able to use a fn item instead
// of a closure for do_some_fallible_work,
// but it's a type error.
let do_some_fallible_work: &fn() = || { };
fn do_some_fallible_work() {}
fn but_always_run_this_function() { }
do_some_fallible_work.finally(
but_always_run_this_function);
@ -136,4 +130,4 @@ fn test_managed() {
};
assert_eq!(do managed.finally {}, 10);
assert_eq!(*i, 20);
}
}