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singleflight: add OnceGroup #97

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kevinburke
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OnceGroup.Do has the same semantics as Group.Do, but caches and
returns the first computed result if called sequentially.

OnceGroup.Do has the same semantics as Group.Do, but caches and
returns the first computed result if called sequentially.

Fixes golang#96.
@bradfitz
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Not really a fan of its name, nor expanding the API. I kinda consider this package done, working, and frozen. Can't your fill function do its own caching if that's desired?

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3 participants