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Date: Wed, 21 Sep 2016 09:43:00 -0000
From: Jonathan Wakely <jwakely@redhat.com>
To: Ville Voutilainen <ville.voutilainen@gmail.com>
Cc: libstdc++ <libstdc++@gcc.gnu.org>,        "gcc-patches@gcc.gnu.org" <gcc-patches@gcc.gnu.org>
Subject: Re: [v3 PATCH] PR libstdc++/77288 and the newest proposed resolution for LWG 2756
Message-ID: <20160921093115.GI17376@redhat.com>
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On 06/09/16 09:00 +0300, Ville Voutilainen wrote:
>    PR libstdc++/77288
>    * include/std/optional (__is_optional_impl, __is_optional): Remove.
>    (__converts_from_optional, __assigns_from_optional): New.
>    (optional(_Up&&)): Use is_same instead of __is_optional.
>    (optional(const optional<_Up>&)): Constrain with
>    __converts_from_optional.
>    (optional(optional<_Up>&&)): Likewise.
>    (operator=(_Up&&)): Use is_same instead of __is_optional, check
>    is_same and is_scalar.
>    (operator=(const optional<_Up>&)): Constrain with
>    __converts_from_optional and __assigns_from_optional.
>    (operator=(optional<_Up>&&)): Likewise.
>    * testsuite/20_util/optional/77288.cc: New.
>    * testsuite/20_util/optional/cons/value.cc: Adjust.

OK for trunk, thanks.