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io/ioutil: add a comment on why devNull is a ReaderFrom

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... protects this optimization from future well-meaning
Gophers looking to delete unused code. :)

R=gri
CC=golang-dev
https://golang.org/cl/5165041
This commit is contained in:
Brad Fitzpatrick 2011-09-29 15:35:01 -07:00
parent 807eb29f9f
commit 51b09190ac
1 changed files with 4 additions and 0 deletions
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4
src/pkg/io/ioutil/ioutil.go
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@ -104,6 +104,10 @@ func NopCloser(r io.Reader) io.ReadCloser {
type devNull int
// devNull implements ReaderFrom as an optimization so io.Copy to
// ioutil.Discard can avoid doing unnecessary work.
var _ io.ReaderFrom = devNull(0)
func (devNull) Write(p []byte) (int, os.Error) {
return len(p), nil
}