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[v3 PATCH] Implement LWG 2744 and LWG 2754.

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>, Paolo Carlini <paolo dot carlini at oracle dot com>
Date: Tue, 9 Aug 2016 18:00:53 +0300
Subject: [v3 PATCH] Implement LWG 2744 and LWG 2754.
Authentication-results: sourceware.org; auth=none

Tested on Linux-x64.

2016-08-09  Ville Voutilainen  <ville.voutilainen@gmail.com>

    Implement LWG 2744 and LWG 2754.
    * include/std/any (any(ValueType&&)): Constrain with __is_in_place.
    (any(in_place_type_t<_ValueType>, _Args&&...)): Use _Decay.
    (any(in_place_type_t<_ValueType>, initializer_list<_Up>, _Args&&...)):
    Likewise.
    (emplace(_Args&&...)): Likewise.
    (emplace(initializer_list<_Up>, _Args&&...)): Likewise.
    * include/std/utility: (__is_in_place_impl, __is_in_place): New.
    * testsuite/20_util/any/assign/emplace.cc: Add tests for decaying
    emplace.
    * testsuite/20_util/any/cons/in_place.cc: Add tests for decaying
    in_place constructor.
    * testsuite/20_util/any/misc/any_cast_neg.cc: Adjust.

Attachment: lwg2754.diff
Description: Text document

Follow-Ups:
- Re: [v3 PATCH] Implement LWG 2744 and LWG 2754.
  - From: Jonathan Wakely

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