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Add MemWriter::from_vec #18329

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Merged
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Oct 28, 2014
Merged

Add MemWriter::from_vec #18329

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9 changes: 7 additions & 2 deletions src/libstd/io/mem.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -22,7 +22,7 @@ use slice;
use slice::AsSlice;
use vec::Vec;

static BUF_CAPACITY: uint = 128;
const BUF_CAPACITY: uint = 128;

fn combine(seek: SeekStyle, cur: uint, end: uint, offset: i64) -> IoResult<u64> {
// compute offset as signed and clamp to prevent overflow
Expand Down Expand Up @@ -71,7 +71,12 @@ impl MemWriter {
/// the internal buffer.
#[inline]
pub fn with_capacity(n: uint) -> MemWriter {
MemWriter { buf: Vec::with_capacity(n) }
MemWriter::from_vec(Vec::with_capacity(n))
}
/// Create a new `MemWriter` that will append to an existing `Vec`.
#[inline]
pub fn from_vec(buf: Vec<u8>) -> MemWriter {
MemWriter { buf: buf }
}

/// Acquires an immutable reference to the underlying buffer of this
Expand Down