diff options
| -rw-r--r-- | src/libstd/rand/reader.rs | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/src/libstd/rand/reader.rs b/src/libstd/rand/reader.rs index 78dad30117d..961a5b2cd28 100644 --- a/src/libstd/rand/reader.rs +++ b/src/libstd/rand/reader.rs @@ -47,6 +47,9 @@ impl<R: Reader> ReaderRng<R> { impl<R: Reader> Rng for ReaderRng<R> { fn next_u32(&mut self) -> u32 { + // This is designed for speed: reading a LE integer on a LE + // platform just involves blitting the bytes into the memory + // of the u32, similarly for BE on BE; avoiding byteswapping. if cfg!(target_endian="little") { self.reader.read_le_u32_() } else { @@ -54,6 +57,7 @@ impl<R: Reader> Rng for ReaderRng<R> { } } fn next_u64(&mut self) -> u64 { + // see above for explanation. if cfg!(target_endian="little") { self.reader.read_le_u64_() } else { |