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core: Don't call into the runtime to reserve if we have capacity

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This commit is contained in:
Brian Anderson 2012-03-28 23:18:36 -07:00
parent c0a99790cb
commit b7b66b6cb3
2 changed files with 7 additions and 2 deletions
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4
src/libcore/str.rs
View File

@ -1504,7 +1504,9 @@ capacity, then no action is taken.
* n - The number of bytes to reserve space for
"]
fn reserve(&s: str, n: uint) {
rustrt::str_reserve_shared(s, n);
if capacity(s) < n {
rustrt::str_reserve_shared(s, n);
}
}
#[doc = "

5
src/libcore/vec.rs
View File

@ -113,7 +113,10 @@ capacity, then no action is taken.
* n - The number of elements to reserve space for
"]
fn reserve<T>(&v: [const T], n: uint) {
rustrt::vec_reserve_shared(sys::get_type_desc::<T>(), v, n);
// Only make the (slow) call into the runtime if we have to
if capacity(v) < n {
rustrt::vec_reserve_shared(sys::get_type_desc::<T>(), v, n);
}
}
#[doc = "