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

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: Wed, 19 Oct 2016 22:35:14 +0300
Subject: [v3 PATCH] Do the operator= SFINAE in the return type for optional, not in the template parameters.
Authentication-results: sourceware.org; auth=none

Tested on Linux-x64.

2016-10-19  Ville Voutilainen  <ville.voutilainen@gmail.com>

    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.

Attachment: optional-assign-sfinae.diff
Description: Text document

Follow-Ups:
- Re: [v3 PATCH] Do the operator= SFINAE in the return type for optional, not in the template parameters.
  - From: Jonathan Wakely

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