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[v3 PATCH] Implement LWG 2857, {variant,optional,any}::emplace should return the constructed value.

From: Ville Voutilainen <ville dot voutilainen at gmail dot com>
To: "libstdc++" <libstdc++ at gcc dot gnu dot org>, "gcc-patches at gcc dot gnu dot org" <gcc-patches at gcc dot gnu dot org>
Date: Thu, 16 Mar 2017 00:21:04 +0200
Subject: [v3 PATCH] Implement LWG 2857, {variant,optional,any}::emplace should return the constructed value.
Authentication-results: sourceware.org; auth=none

Tested on Linux-x64.

2017-03-16  Ville Voutilainen  <ville.voutilainen@gmail.com>

    Implement LWG 2857, {variant,optional,any}::emplace should
    return the constructed value.
    * include/std/any (any_cast(any*)): Forward-declare.
    (emplace(_Args&&...)): Change the return type and
    return a reference to the constructed value.
    (emplace(initializer_list<_Up>, _Args&&...)): Likewise.
    * include/std/optional (emplace(_Args&&...)): Likewise.
    (emplace(initializer_list<_Up>, _Args&&...)): Likewise.
    * include/std/variant (emplace<_Tp>(_Args&&...)): Likewise.
    (emplace<_Tp>(initializer_list<_Up>, _Args&&...)): Likewise.
    (emplace<_Np>(_Args&&...)): Likewise.
    (emplace<_Np>(initializer_list<_Up>, _Args&&...)): Likewise.
    * testsuite/20_util/any/assign/emplace.cc: Add tests for
    checking the return value of emplace.
    * testsuite/20_util/any/misc/any_cast_neg.cc: Adjust.
    * testsuite/20_util/optional/assignment/6.cc: Add tests for
    checking the return value of emplace.
    * testsuite/20_util/variant/run.cc: Likewise.

Attachment: lwg2857.diff
Description: Text document

Follow-Ups:
- Re: [v3 PATCH] Implement LWG 2857, {variant,optional,any}::emplace should return the constructed value.
  - From: Jonathan Wakely

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