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Add capacity() to VecMap #19528

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Dec 5, 2014
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Add capacity() to VecMap #19528

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16 changes: 16 additions & 0 deletions src/libcollections/vec_map.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -115,6 +115,22 @@ impl<V> VecMap<V> {
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.
/// The iterator's element type is `uint`.
#[unstable = "matches collection reform specification, waiting for dust to settle"]
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