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[v3 PATCH] Implement 2801, Default-constructibility of unique_ptr.

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: Tue, 20 Dec 2016 22:52:41 +0200
Subject: [v3 PATCH] Implement 2801, Default-constructibility of unique_ptr.
Authentication-results: sourceware.org; auth=none

Tested on Linux-x64.

The issue doesn't have a proposed resolution yet, so we can certainly wait
with this, but I have an inkling that this implementation is what the proposed
resolution must say. :)

2016-12-20  Ville Voutilainen  <ville.voutilainen@gmail.com>

    Implement 2801, Default-constructibility of unique_ptr.
    * include/bits/unique_ptr.h (unique_ptr()): Constrain.
    (unique_ptr(pointer)): Likewise.
    (unique_ptr(nullptr_t)): Likewise.
    (unique_ptr<_Tp[], _Dp>::unique_ptr()): Likewise.
    (unique_ptr<_Tp[], _Dp>::unique_ptr(_Up)): Likewise.
    (unique_ptr<_Tp[], _Dp>::unique_ptr(nullptr_t)): Likewise.
    * testsuite/20_util/unique_ptr/assign/48635_neg.cc: Adjust.
    * testsuite/20_util/unique_ptr/cons/cv_qual_neg.cc: Likewise.
    * testsuite/20_util/unique_ptr/cons/default.cc: New.
    * testsuite/20_util/unique_ptr/cons/ptr_deleter_neg.cc: Adjust.

Attachment: lwg2801.diff
Description: Text document

Follow-Ups:
- Re: [v3 PATCH] Implement 2801, Default-constructibility of unique_ptr.
  - From: Jonathan Wakely

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