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io: more docs on WriterAt

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Updates #1599

R=golang-dev, gri, rsc
CC=golang-dev
https://golang.org/cl/5774043
This commit is contained in:
Brad Fitzpatrick 2012-03-07 10:54:04 -08:00
parent 4aab8806e7
commit 0210f4137b
1 changed files with 7 additions and 0 deletions
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7
src/pkg/io/io.go
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@ -173,6 +173,13 @@ type ReaderAt interface {
// at offset off. It returns the number of bytes written from p (0 <= n <= len(p)) // at offset off. 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.
// WriteAt must return a non-nil error if it returns n < len(p). // WriteAt must return a non-nil error if it returns n < len(p).
//
// If WriteAt is writing to a destination with a seek offset,
// WriteAt should not affect nor be affected by the underlying
// seek offset.
//
// Clients of WriteAt can execute parallel WriteAt calls on the same
// destination if the ranges are not overlapping.
type WriterAt interface { type WriterAt interface {
WriteAt(p []byte, off int64) (n int, err error) WriteAt(p []byte, off int64) (n int, err error)
} }