[PATCH] D31956: Implement (part of) LWG2857: `{variant, optional, any}::emplace` should return the constructed value

[Marshall Clow via Phabricator via cfe-commits]

mclow.lists created this revision.

Implement the `optional` and `any` part of this issue.

This changes the return type of these functions.


https://reviews.llvm.org/D31956

Files:
  include/any
  include/optional
  test/std/utilities/any/any.class/any.modifiers/emplace.pass.cpp
  test/std/utilities/optional/optional.object/optional.object.assign/emplace.pass.cpp

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