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auto merge of #13241 : stepancheg/rust/push-all, r=alexcrichton 

* push_all* operations should reserve capacity before pushing data to avoid unnecessary reallocations
* reserve_exact should never shrink, as specified in documentation
This commit is contained in:
bors 2014-04-01 21:21:48 -07:00
parent e63346b9d8 026d206aa1
commit af0783aa1f
1 changed files with 3 additions and 7 deletions
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10
src/libstd/vec.rs
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@ -230,9 +230,7 @@ impl<T: Clone> Vec<T> {
/// ```
#[inline]
pub fn push_all(&mut self, other: &[T]) {
for element in other.iter() {
self.push((*element).clone())
}
self.extend(other.iter().map(|e| e.clone()));
}
/// Grows the `Vec` in-place.
@ -447,7 +445,7 @@ impl<T> Vec<T> {
/// assert_eq!(vec.capacity(), 11);
/// ```
pub fn reserve_exact(&mut self, capacity: uint) {
if capacity >= self.len {
if capacity > self.cap {
let size = capacity.checked_mul(&size_of::<T>()).expect("capacity overflow");
self.cap = capacity;
unsafe {
@ -947,9 +945,7 @@ impl<T> Vec<T> {
/// assert_eq!(vec, vec!(~1, ~2, ~3, ~4));
/// ```
pub fn push_all_move(&mut self, other: Vec<T>) {
for element in other.move_iter() {
self.push(element)
}
self.extend(other.move_iter());
}
/// Returns a mutable slice of `self` between `start` and `end`.