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rollup merge of #19528: aliblong/add_vecmap_capacity

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Part of #18424

Adds `capacity()` function to VecMap, as per the collections reform.

(Salvaged from #19516, #19523, while we await an RFC regarding `reserve`/`reserve_index` for `VecMap`)
This commit is contained in:
Corey Richardson 2014-12-05 10:08:24 -08:00
commit d602c058ae
1 changed files with 16 additions and 0 deletions
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16
src/libcollections/vec_map.rs
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@ -115,6 +115,22 @@ impl<V> VecMap<V> {
VecMap { v: Vec::with_capacity(capacity) } VecMap { v: Vec::with_capacity(capacity) }
} }
/// Returns the number of elements the `VecMap` can hold without
/// reallocating.
///
/// # Example
///
/// ```
/// use std::collections::VecMap;
/// let map: VecMap<String> = VecMap::with_capacity(10);
/// assert!(map.capacity() >= 10);
/// ```
#[inline]
#[unstable = "matches collection reform specification, waiting for dust to settle"]
pub fn capacity(&self) -> uint {
self.v.capacity()
}
/// Returns an iterator visiting all keys in ascending order by the keys. /// Returns an iterator visiting all keys in ascending order by the keys.
/// The iterator's element type is `uint`. /// The iterator's element type is `uint`.
#[unstable = "matches collection reform specification, waiting for dust to settle"] #[unstable = "matches collection reform specification, waiting for dust to settle"]