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Brad Fitzpatrick authored
As noted on recently on golang-nuts, there's currently no way to know the total size of a strings.Reader or bytes.Reader when using ReadAt on them. Most callers resort to wrapping it in an io.SectionReader to retain that information. The SizeReaderAt abstraction (an io.ReaderAt with a Size() int64 method) has proven useful as a way of expressing a concurrency-safe read-only number of bytes. As one example, see http://talks.golang.org/2013/oscon-dl.slide#49 and the rest of that presentation for its use in dl.google.com. SizeReaderAt is also used in the open source google-api-go-client, and within Google's internal codebase, where it exists in a public package created in 2013 with the package comment: "These may migrate to the standard library after we have enough experience with their feel." I'm still as happy with the SizeReaderAt abstraction and its composabilty as I was in 2013, so I'd like to make these two Readers also be SizeReaderAts. Fixes #9667 Change-Id: Ie6f145ada419dd116280472d8c029f046d5edf70 Reviewed-on: https://go-review.googlesource.com/3199Reviewed-by:
Andrew Gerrand <adg@golang.org> Reviewed-by:
Russ Cox <rsc@golang.org> Reviewed-by:
Rob Pike <r@golang.org>
c264c873
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buffer.go | ||
buffer_test.go | ||
bytes.go | ||
bytes_decl.go | ||
bytes_test.go | ||
compare_test.go | ||
equal_test.go | ||
example_test.go | ||
export_test.go | ||
reader.go | ||
reader_test.go |