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io: make CopyBuffer docs state when buf is not used

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Document that if either src implements the WriteTo interface
or if dst implements the ReaderFrom interface, then
buf will not be used.

Fixes #32276

Change-Id: Id0a69c90e255e694e7ec9f79ffe4d8391441e59e
GitHub-Last-Rev: 750e7e86d5
GitHub-Pull-Request: golang/go#32279
Reviewed-on: https://go-review.googlesource.com/c/go/+/179137
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
This commit is contained in:
sandyskies 2019-10-21 17:32:13 +00:00 committed by Emmanuel Odeke
parent 58b031949b
commit 03978a97e5
1 changed files with 3 additions and 0 deletions
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3
src/io/io.go
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@ -368,6 +368,9 @@ func Copy(dst Writer, src Reader) (written int64, err error) {
// provided buffer (if one is required) rather than allocating a
// temporary one. If buf is nil, one is allocated; otherwise if it has
// zero length, CopyBuffer panics.
//
// If either src implements WriterTo or dst implements ReaderFrom,
// buf will not be used to perform the copy.
func CopyBuffer(dst Writer, src Reader, buf []byte) (written int64, err error) {
if buf != nil && len(buf) == 0 {
panic("empty buffer in io.CopyBuffer")