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| author | Tobias Bucher <tobiasbucher5991@gmail.com> | 2016-07-18 14:31:26 +0200 |
|---|---|---|
| committer | Tobias Bucher <tobiasbucher5991@gmail.com> | 2016-08-05 20:18:31 +0200 |
| commit | 291b6f16bb03c92fb383dfa12b8849808bace801 (patch) | |
| tree | d85d315c414287f54961df6ef9084e69cac090d9 /src/libstd/sys/windows | |
| parent | 6cc49e51de7ea9b0cc4aff437975544233c57107 (diff) | |
| download | rust-291b6f16bb03c92fb383dfa12b8849808bace801.tar.gz rust-291b6f16bb03c92fb383dfa12b8849808bace801.zip | |
Comment on the casts in the `seek` implementations on files
Diffstat (limited to 'src/libstd/sys/windows')
| -rw-r--r-- | src/libstd/sys/windows/fs.rs | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/src/libstd/sys/windows/fs.rs b/src/libstd/sys/windows/fs.rs index 2683e57256d..4e6cef9a28d 100644 --- a/src/libstd/sys/windows/fs.rs +++ b/src/libstd/sys/windows/fs.rs @@ -324,6 +324,8 @@ impl File { pub fn seek(&self, pos: SeekFrom) -> io::Result<u64> { let (whence, pos) = match pos { + // Casting to `i64` is fine, `SetFilePointerEx` reinterprets this + // integer as `u64`. SeekFrom::Start(n) => (c::FILE_BEGIN, n as i64), SeekFrom::End(n) => (c::FILE_END, n), SeekFrom::Current(n) => (c::FILE_CURRENT, n), |