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[v3 PATCH] Cross-port the latest resolution of LWG2756 and some bug-fixes to experimental::optional.

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: Sat, 22 Oct 2016 19:34:48 +0300
Subject: [v3 PATCH] Cross-port the latest resolution of LWG2756 and some bug-fixes to experimental::optional.
Authentication-results: sourceware.org; auth=none

Tested on Linux-x64. Ok for trunk and the gcc-6 branch?

2016-10-22  Ville Voutilainen  <ville.voutilainen@gmail.com>

    Cross-port the latest resolution of LWG2756 and some
    bug-fixes to experimental::optional.
    PR libstc++/77288
    PR libstdc++/77727
    * include/experimental/optional (_Optional_base):
    Remove constructors that take a _Tp.
    (__is_optional_impl, __is_optional): Remove.
    (__converts_from_optional): New.
    (optional(_Up&&)): Fix constraints, call base with in_place.
    (optional(const optional<_Up>&)): Fix constraints, use emplace.
    (optional(optional<_Up>&&)): Likewise.
    (operator=(_Up&&)): Fix constraints.
    (operator=(const optional<_Up>&)): Likewise.
    (operator=(optional<_Up>&&)): Likewise.
    (emplace(_Args&&...)): Constrain.
    (emplace(initializer_list<_Up>, _Args&&...)): Likewise.
    * testsuite/experimental/optional/77288.cc: New.
    * testsuite/experimental/optional/assignment/5.cc: Adjust.
    * testsuite/experimental/optional/cons/77727.cc: New.
    * testsuite/experimental/optional/cons/value.cc: Adjust.

Attachment: optional-crossport.diff
Description: Text document

Follow-Ups:
- Re: [v3 PATCH] Cross-port the latest resolution of LWG2756 and some bug-fixes to experimental::optional.
  - From: Ville Voutilainen

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