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[v3 PATCH] Implement LWG 2900, The copy and move constructors of optional are not constexpr.

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: Fri, 17 Mar 2017 16:51:43 +0200
Subject: [v3 PATCH] Implement LWG 2900, The copy and move constructors of optional are not constexpr.
Authentication-results: sourceware.org; auth=none

Tested on Linux-x64.

2017-03-17  Ville Voutilainen  <ville.voutilainen@gmail.com>

    Implement LWG 2900, The copy and move constructors
    of optional are not constexpr.
    * include/std/optional (_Optional_payload): New.
    (_Optional_base): Remove the bool parameter.
    (_Optional_base<_Tp, false>): Remove.
    (_Optional_base()): Adjust.
    (_Optional_base(nullopt_t)): Likewise.
    (_Optional_base(in_place_t, _Args&&...)): Likewise.
    (_Optional_base(in_place_t, initializer_list<_Up>, _Args&&...)):
    Likewise.
    (_Optional_base(const _Optional_base&)): Likewise.
    (_Optional_base(_Optional_base&&)): Likewise.
    (operator=(const _Optional_base&)): Likewise.
    (operator=(_Optional_base&&)): Likewise.
    (~_Optional_base()): Remove.
    (_M_is_engaged()): Adjust.
    (_M_get()): Likewise.
    (_M_construct(_Args&&...)): Likewise.
    (_M_destruct()): Likewise.
    (_M_reset()): Likewise.
    (_Optional_base::_Empty_byte): Remove.
    (_Optional_base::_M_empty): Remove.
    (_Optional_base::_M_payload): Adjust.
    * testsuite/20_util/optional/cons/value_neg.cc: Adjust.
    * testsuite/20_util/optional/constexpr/cons/value.cc: Add tests.

Attachment: lwg2900.diff
Description: Text document

Follow-Ups:
- Re: [v3 PATCH] Implement LWG 2900, The copy and move constructors of optional are not constexpr.
  - From: Jonathan Wakely

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