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Re: [v3 PATCH] Do the operator= SFINAE in the return type for optional, not in the template parameters.

From: Jonathan Wakely <jwakely at redhat dot com>
To: Ville Voutilainen <ville dot voutilainen at gmail dot com>
Cc: 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, 20 Oct 2016 11:54:24 +0100
Subject: Re: [v3 PATCH] Do the operator= SFINAE in the return type for optional, not in the template parameters.
Authentication-results: sourceware.org; auth=none
References: <CAFk2RUbOFd8zbrWgB+gHGEYG8hmG8W9eySivbVobxqxny=Utnw@mail.gmail.com>

On 19/10/16 22:35 +0300, Ville Voutilainen wrote:

   Do the operator= SFINAE in the return type for optional,
   not in the template parameters.
   * include/std/optional (operator=(_Up&&)): Move SFINAE
   from template parameters to the return type.
   (operator=(const optional<_Up>&)): Likewise.
   (operator=(optional<_Up>&&)): Likewise.

OK.

References:
- [v3 PATCH] Do the operator= SFINAE in the return type for optional, not in the template parameters.
  - From: Ville Voutilainen

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