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io: CopyBuffer should document when buf is not used #32276

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sandyskies opened this issue May 28, 2019 · 3 comments
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io: CopyBuffer should document when buf is not used #32276

sandyskies opened this issue May 28, 2019 · 3 comments
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Documentation FrozenDueToAge NeedsDecision Feedback is required from experts, contributors, and/or the community before a change can be made.

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@sandyskies
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The follow is the comment for io.CopyBuffer,
// CopyBuffer is identical to Copy except that it stages through the
// 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.
func CopyBuffer(dst Writer, src Reader, buf []byte) (written int64, err error)

which is not precise enough, in the case of src implements the WriterTo interface or the case of if dst implements the ReaderFrom interface , buf will be ignore ,which is not mentioned at all. Which is very easy to lead people to wrong way.
This was referenced May 28, 2019
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@bcmills bcmills added Documentation NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. labels May 28, 2019
@bcmills
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bcmills commented May 28, 2019

This closely relates to #16474.

@sandyskies
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@bcmills Before the API is changed, we should add more comment to explain the behavior. This PR
is for adding the comment. #32279

@bcmills bcmills added NeedsDecision Feedback is required from experts, contributors, and/or the community before a change can be made. and removed NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. labels May 29, 2019
@bcmills bcmills mentioned this issue May 29, 2019
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@odeke-em odeke-em changed the title io: CopyBuffer comment should be more precise io: CopyBuffer should document when buf is not used Oct 15, 2019
sandyskies added a commit to sandyskies/go that referenced this issue Oct 20, 2019
@sandyskies
io: make CopyBuffer docs state when buf is not used
1b541b4 
Document that if either src implements the WriteTo interface
or if dst implements the ReaderFrom interface, then
buf will not be used.

Fixes golang#32276
sandyskies added a commit to sandyskies/go that referenced this issue Oct 21, 2019
@sandyskies
io: make CopyBuffer docs state when buf is not used
750e7e8 
Document that if either src implements the WriteTo interface
or if dst implements the ReaderFrom interface, then
buf will not be used.

Fixes golang#32276
@gopherbot
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Change https://golang.org/cl/179137 mentions this issue: io: make CopyBuffer docs state when buf is not used

@jacobmarble jacobmarble mentioned this issue Nov 20, 2019
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@sandyskies @bcmills @gopherbot