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Merge pull request #3526 from Dretch/viewmethod

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Make vec::view a method too.
This commit is contained in:
Brian Anderson 2012-09-26 21:08:26 -07:00
commit 2340ef96d5
1 changed files with 6 additions and 4 deletions
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10
src/libcore/vec.rs
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@ -1526,6 +1526,7 @@ impl<T: Copy> &[const T]: CopyableVector<T> {
}
trait ImmutableVector<T> {
pure fn view(start: uint, end: uint) -> &[T];
pure fn foldr<U: Copy>(z: U, p: fn(T, U) -> U) -> U;
pure fn map<U>(f: fn(v: &T) -> U) -> ~[U];
pure fn mapi<U>(f: fn(uint, v: &T) -> U) -> ~[U];
@ -1544,6 +1545,10 @@ trait ImmutableEqVector<T: Eq> {
/// Extension methods for vectors
impl<T> &[T]: ImmutableVector<T> {
/// Return a slice that points into another slice.
pure fn view(start: uint, end: uint) -> &[T] {
view(self, start, end)
}
/// Reduce a vector from right to left
#[inline]
pure fn foldr<U: Copy>(z: U, p: fn(T, U) -> U) -> U { foldr(self, z, p) }
@ -2804,17 +2809,14 @@ mod tests {
assert capacity(v) == 10u;
}
/*
#[test]
#[ignore] // region inference doesn't work well enough for this yet.
fn test_view() {
let v = ~[1, 2, 3, 4, 5];
let v = view(v, 1u, 3u);
let v = v.view(1u, 3u);
assert(len(v) == 2u);
assert(v[0] == 2);
assert(v[1] == 3);
}
*/
}
// Local Variables: