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Add option::get_ref

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This commit is contained in:
Ben Blum 2012-08-16 21:06:05 -04:00
parent a076c287de
commit 0e3825d38c
1 changed files with 16 additions and 0 deletions
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16
src/libcore/option.rs
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@ -29,6 +29,20 @@ pure fn get<T: copy>(opt: option<T>) -> T {
}
}
pure fn get_ref<T>(opt: &option<T>) -> &T {
/*!
* Gets an immutable reference to the value inside an option.
*
* # Failure
*
* Fails if the value equals `none`
*/
match *opt {
some(ref x) => x,
none => fail ~"option::get_ref none"
}
}
pure fn expect<T: copy>(opt: option<T>, reason: ~str) -> T {
#[doc = "
Gets the value out of an option, printing a specified message on failure
@ -201,6 +215,8 @@ impl<T> &option<T> {
pure fn iter_ref(f: fn(x: &T)) { iter_ref(self, f) }
/// Maps a `some` value from one type to another by reference
pure fn map_ref<U>(f: fn(x: &T) -> U) -> option<U> { map_ref(self, f) }
/// Gets an immutable reference to the value inside a `some`.
pure fn get_ref() -> &self/T { get_ref(self) }
}
impl<T: copy> option<T> {