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io: document ReaderFrom and WriterTo

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Fixes #3711

R=golang-dev, adg
CC=golang-dev
https://golang.org/cl/6445083
This commit is contained in:
Brad Fitzpatrick 2012-08-07 16:10:10 +10:00
parent b3caa2ba3c
commit c8423f9002
1 changed files with 12 additions and 0 deletions
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12
src/pkg/io/io.go
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@ -130,11 +130,23 @@ type ReadWriteSeeker interface {
}
// ReaderFrom is the interface that wraps the ReadFrom method.
//
// ReadFrom reads data from r until EOF. The return value n is the
// number of bytes read. Any error except io.EOF encountered during
// the read is also returned.
//
// The Copy function uses ReaderFrom if available.
type ReaderFrom interface {
ReadFrom(r Reader) (n int64, err error)
}
// WriterTo is the interface that wraps the WriteTo method.
//
// WriteTo writes data to w until there's no more data to write or
// when an error occurs. The return value n is the number of bytes
// written. Any error encountered during the write is also returned.
//
// The Copy function uses WriterTo if available.
type WriterTo interface {
WriteTo(w Writer) (n int64, err error)
}