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io: document that a Writer must not write to p

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Per golang-nuts question. Writing to p breaks
other writers (e.g. io.MultiWriter).

Make this explicit.

LGTM=gri, r, rsc
R=r, rsc, gri, joshlf13
CC=golang-codereviews
https://golang.org/cl/87780046
This commit is contained in:
Brad Fitzpatrick 2014-04-15 17:14:03 -07:00
parent 44f96d4488
commit a1ae3a0536
1 changed files with 1 additions and 0 deletions
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src/pkg/io/io.go
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@ -74,6 +74,7 @@ type Reader interface {
// It returns the number of bytes written from p (0 <= n <= len(p)) // It returns the number of bytes written from p (0 <= n <= len(p))
// and any error encountered that caused the write to stop early. // and any error encountered that caused the write to stop early.
// Write must return a non-nil error if it returns n < len(p). // Write must return a non-nil error if it returns n < len(p).
// Write must not modify the slice data, even temporarily.
type Writer interface { type Writer interface {
Write(p []byte) (n int, err error) Write(p []byte) (n int, err error)
} }