[{"id":1767953,"web_url":"http://patchwork.ozlabs.org/comment/1767953/","msgid":"<20170913145546.GY4582@redhat.com>","list_archive_url":null,"date":"2017-09-13T14:55:46","subject":"Re: [PATCH] PR libstdc++/81468 constrain std::chrono::time_point\n\tconstructor","submitter":{"id":48004,"url":"http://patchwork.ozlabs.org/api/people/48004/","name":"Jonathan Wakely","email":"jwakely@redhat.com"},"content":"On 13/09/17 15:09 +0100, Jonathan Wakely wrote:\n>Howard reported this bug, caused by a missing SFINAE constraint on a\n>std::chrono::time_point constructor.\n>\n>I've also done a bit of simplification using alias templates.\n\nHere's the backport for the branches, which just adds the constraint\n(and tests) without the new alias templates.\ncommit 4a6c846f3203dd0ceb13b7130e686833a4150d96\nAuthor: Jonathan Wakely \nDate: Wed Sep 13 15:16:31 2017 +0100\n\n PR libstdc++/81468 constrain std::chrono::time_point constructor\n \n PR libstdc++/81468\n * include/std/chrono (time_point(const time_point<_Dur2>&)): Add\n missing constraint from LWG DR 1177.\n * testsuite/20_util/duration/cons/dr1177.cc: New.\n * testsuite/20_util/time_point/cons/81468.cc: New.\n * testsuite/20_util/duration/literals/range.cc: Update dg-error line.\n\ndiff --git a/libstdc++-v3/include/std/chrono b/libstdc++-v3/include/std/chrono\nindex c3a6ba8f873..cc63d44657b 100644\n--- a/libstdc++-v3/include/std/chrono\n+++ b/libstdc++-v3/include/std/chrono\n@@ -622,7 +622,8 @@ _GLIBCXX_END_NAMESPACE_VERSION\n \t{ }\n \n \t// conversions\n-\ttemplate\n+\ttemplate>>\n \t constexpr time_point(const time_point& __t)\n \t : __d(__t.time_since_epoch())\n \t { }\ndiff --git a/libstdc++-v3/testsuite/20_util/duration/cons/dr1177.cc b/libstdc++-v3/testsuite/20_util/duration/cons/dr1177.cc\nnew file mode 100644\nindex 00000000000..28c881ccc79\n--- /dev/null\n+++ b/libstdc++-v3/testsuite/20_util/duration/cons/dr1177.cc\n@@ -0,0 +1,41 @@\n+// Copyright (C) 2017 Free Software Foundation, Inc.\n+//\n+// This file is part of the GNU ISO C++ Library. This library is free\n+// software; you can redistribute it and/or modify it under the\n+// terms of the GNU General Public License as published by the\n+// Free Software Foundation; either version 3, or (at your option)\n+// any later version.\n+\n+// This library is distributed in the hope that it will be useful,\n+// but WITHOUT ANY WARRANTY; without even the implied warranty of\n+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n+// GNU General Public License for more details.\n+\n+// You should have received a copy of the GNU General Public License along\n+// with this library; see the file COPYING3. If not see\n+// .\n+\n+// { dg-do compile { target c++11 } }\n+\n+#include \n+#include \n+\n+using namespace std;\n+using namespace std::chrono;\n+\n+// DR 1177\n+static_assert(is_constructible, duration>{},\n+ \"can convert duration with one floating point rep to another\");\n+static_assert(is_constructible, duration>{},\n+ \"can convert duration with integral rep to one with floating point rep\");\n+static_assert(!is_constructible, duration>{},\n+ \"cannot convert duration with floating point rep to one with integral rep\");\n+static_assert(is_constructible, duration>{},\n+ \"can convert duration with one integral rep to another\");\n+\n+static_assert(!is_constructible, duration>>{},\n+ \"cannot convert duration to one with different period\");\n+static_assert(is_constructible, duration>>{},\n+ \"unless it has a floating-point representation\");\n+static_assert(is_constructible, duration>>{},\n+ \"or a period that is an integral multiple of the original\");\ndiff --git a/libstdc++-v3/testsuite/20_util/duration/literals/range.cc b/libstdc++-v3/testsuite/20_util/duration/literals/range.cc\nindex c0d1a6e5885..531b53c42ec 100644\n--- a/libstdc++-v3/testsuite/20_util/duration/literals/range.cc\n+++ b/libstdc++-v3/testsuite/20_util/duration/literals/range.cc\n@@ -26,6 +26,6 @@ test01()\n \n // std::numeric_limits::max() == 9223372036854775807;\n auto h = 9223372036854775808h;\n- // { dg-error \"cannot be represented\" \"\" { target *-*-* } 892 }\n+ // { dg-error \"cannot be represented\" \"\" { target *-*-* } 893 }\n }\n // { dg-prune-output \"in constexpr expansion\" } // needed for -O0\ndiff --git a/libstdc++-v3/testsuite/20_util/time_point/cons/81468.cc b/libstdc++-v3/testsuite/20_util/time_point/cons/81468.cc\nnew file mode 100644\nindex 00000000000..30d1c4a5ac7\n--- /dev/null\n+++ b/libstdc++-v3/testsuite/20_util/time_point/cons/81468.cc\n@@ -0,0 +1,34 @@\n+// Copyright (C) 2017 Free Software Foundation, Inc.\n+//\n+// This file is part of the GNU ISO C++ Library. This library is free\n+// software; you can redistribute it and/or modify it under the\n+// terms of the GNU General Public License as published by the\n+// Free Software Foundation; either version 3, or (at your option)\n+// any later version.\n+\n+// This library is distributed in the hope that it will be useful,\n+// but WITHOUT ANY WARRANTY; without even the implied warranty of\n+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n+// GNU General Public License for more details.\n+\n+// You should have received a copy of the GNU General Public License along\n+// with this library; see the file COPYING3. If not see\n+// .\n+\n+// { dg-do compile { target c++11 } }\n+\n+#include \n+#include \n+\n+using namespace std;\n+using namespace std::chrono;\n+\n+template \n+ using sys_time = time_point;\n+\n+static_assert(is_constructible, sys_time>{},\n+ \"Can construct time_point from one with lower precision duration\");\n+\n+// PR libstdc++/81468 - DR 1177\n+static_assert(!is_constructible, sys_time>{},\n+ \"Cannot construct time_point from one with higher precision duration\");","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":["patchwork-incoming@bilbo.ozlabs.org","mailing list gcc-patches@gcc.gnu.org"],"Authentication-Results":["ozlabs.org;\n\tspf=pass (mailfrom) smtp.mailfrom=gcc.gnu.org\n\t(client-ip=209.132.180.131; helo=sourceware.org;\n\tenvelope-from=gcc-patches-return-462041-incoming=patchwork.ozlabs.org@gcc.gnu.org;\n\treceiver=)","ozlabs.org; dkim=pass (1024-bit key;\n\tunprotected) header.d=gcc.gnu.org header.i=@gcc.gnu.org\n\theader.b=\"RX4OhE1N\"; 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c=nofws; d=gcc.gnu.org; h=list-id\n\t:list-unsubscribe:list-archive:list-post:list-help:sender:date\n\t:from:to:subject:message-id:references:mime-version:content-type\n\t:in-reply-to; q=dns; s=default; b=NTEsqCX7kb/R0cnxnoYRAhtDV0voB2\n\tUmiA/pPhJLgct97KxQe0JmAj4AZprVpfRJTIc8NSG72+r1jEDjQdGteADxBRjeyX\n\tjMuQKEYWcey4At+y5si9/rxZhHS+EWeCZt+IU0NKK1SE1mR9rPfMZUF1jj40ZI9q\n\tL79b58W1+d+2I=","DKIM-Signature":"v=1; a=rsa-sha1; c=relaxed; d=gcc.gnu.org; h=list-id\n\t:list-unsubscribe:list-archive:list-post:list-help:sender:date\n\t:from:to:subject:message-id:references:mime-version:content-type\n\t:in-reply-to; s=default; bh=N6AJqtbm7gazpNDLNN0NqeneR1U=; b=RX4O\n\thE1NWqfFAU7VigvZ0c4bCRkt/Ox3pQAmkYhJTeR5A32R1uymzcApPFT9vZK+l9Fz\n\trp149cqUaC07jB6m9erx3EUjnl0ltsoMiD9ItKIvHHxhr0EOMWe2cvD21WL7aMUb\n\tAvtfAKVs01NHOUrFrgMcMIug+Q/qQL5+2/3O+Zc=","Mailing-List":"contact gcc-patches-help@gcc.gnu.org; run by ezmlm","Precedence":"bulk","List-Id":"","List-Unsubscribe":"","List-Archive":"","List-Post":"","List-Help":"","Sender":"gcc-patches-owner@gcc.gnu.org","X-Virus-Found":"No","X-Spam-SWARE-Status":"No, score=-25.9 required=5.0 tests=BAYES_00, GIT_PATCH_0,\n\tGIT_PATCH_1, GIT_PATCH_2, GIT_PATCH_3,\n\tKAM_LAZY_DOMAIN_SECURITY, RP_MATCHES_RCVD,\n\tSPF_HELO_PASS autolearn=ham version=3.3.2 spammy=","X-Spam-User":"qpsmtpd, 2 recipients","X-HELO":"mx1.redhat.com","DMARC-Filter":"OpenDMARC Filter v1.3.2 mx1.redhat.com EF91A267C1","Date":"Wed, 13 Sep 2017 15:55:46 +0100","From":"Jonathan Wakely ","To":"libstdc++@gcc.gnu.org, gcc-patches@gcc.gnu.org","Subject":"Re: [PATCH] PR libstdc++/81468 constrain std::chrono::time_point\n\tconstructor","Message-ID":"<20170913145546.GY4582@redhat.com>","References":"<20170913140903.GA8606@redhat.com>","MIME-Version":"1.0","Content-Type":"multipart/mixed; boundary=\"ZG5hGh9V5E9QzVHS\"","Content-Disposition":"inline","In-Reply-To":"<20170913140903.GA8606@redhat.com>","X-Clacks-Overhead":"GNU Terry Pratchett","User-Agent":"Mutt/1.8.3 (2017-05-23)"}},{"id":1768273,"web_url":"http://patchwork.ozlabs.org/comment/1768273/","msgid":"","list_archive_url":null,"date":"2017-09-14T01:30:25","subject":"Re: [PATCH] PR libstdc++/81468 constrain std::chrono::time_point\n\tconstructor","submitter":{"id":70107,"url":"http://patchwork.ozlabs.org/api/people/70107/","name":"Tim Song","email":"t.canens.cpp@gmail.com"},"content":"On Wed, Sep 13, 2017 at 10:55 AM, Jonathan Wakely wrote:\n>\n> +// DR 1177\n> +static_assert(is_constructible, duration>{},\n> + \"can convert duration with one floating point rep to another\");\n> +static_assert(is_constructible, duration>{},\n> + \"can convert duration with integral rep to one with floating point rep\");\n> +static_assert(!is_constructible, duration>{},\n> + \"cannot convert duration with floating point rep to one with integral rep\");\n> +static_assert(is_constructible, duration>{},\n> + \"can convert duration with one integral rep to another\");\n> +\n> +static_assert(!is_constructible, duration>>{},\n> + \"cannot convert duration to one with different period\");\n> +static_assert(is_constructible, duration>>{},\n> + \"unless it has a floating-point representation\");\n\n\"it\" is a little ambiguous here unless you read the next message's\nmention of \"the original\"...\n\n> +static_assert(is_constructible, duration>>{},\n> + \"or a period that is an integral multiple of the original\");\n\nThis is backwards: duration is convertible to duration iff P1 is an integral multiple of P2, i.e., if the original's\nperiod is an integral multiple of \"its\" period.\n\nThe static assert only passed because duration was used as the\ndestination type (presumably because of a copy/paste error).\n\nTim","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":["patchwork-incoming@bilbo.ozlabs.org","mailing list gcc-patches@gcc.gnu.org"],"Authentication-Results":["ozlabs.org;\n\tspf=pass (mailfrom) smtp.mailfrom=gcc.gnu.org\n\t(client-ip=209.132.180.131; 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charset=\"UTF-8\"","X-IsSubscribed":"yes"}},{"id":1770458,"web_url":"http://patchwork.ozlabs.org/comment/1770458/","msgid":"<20170918200038.GJ4582@redhat.com>","list_archive_url":null,"date":"2017-09-18T20:00:38","subject":"Re: [PATCH] PR libstdc++/81468 constrain std::chrono::time_point\n\tconstructor","submitter":{"id":48004,"url":"http://patchwork.ozlabs.org/api/people/48004/","name":"Jonathan Wakely","email":"jwakely@redhat.com"},"content":"On 13/09/17 21:30 -0400, Tim Song wrote:\n>On Wed, Sep 13, 2017 at 10:55 AM, Jonathan Wakely wrote:\n>>\n>> +// DR 1177\n>> +static_assert(is_constructible, duration>{},\n>> + \"can convert duration with one floating point rep to another\");\n>> +static_assert(is_constructible, duration>{},\n>> + \"can convert duration with integral rep to one with floating point rep\");\n>> +static_assert(!is_constructible, duration>{},\n>> + \"cannot convert duration with floating point rep to one with integral rep\");\n>> +static_assert(is_constructible, duration>{},\n>> + \"can convert duration with one integral rep to another\");\n>> +\n>> +static_assert(!is_constructible, duration>>{},\n>> + \"cannot convert duration to one with different period\");\n>> +static_assert(is_constructible, duration>>{},\n>> + \"unless it has a floating-point representation\");\n>\n>\"it\" is a little ambiguous here unless you read the next message's\n>mention of \"the original\"...\n>\n>> +static_assert(is_constructible, duration>>{},\n>> + \"or a period that is an integral multiple of the original\");\n>\n>This is backwards: duration is convertible to durationP2> iff P1 is an integral multiple of P2, i.e., if the original's\n>period is an integral multiple of \"its\" period.\n>\n>The static assert only passed because duration was used as the\n>destination type (presumably because of a copy/paste error).\n>\n>Tim\n\nGood catch, thanks.\n\nI've committed this patch.\ncommit 5c021e19e0758e5ad7e47feadbd0632b15f85785\nAuthor: Jonathan Wakely \nDate: Mon Sep 18 19:04:25 2017 +0100\n\n PR libstdc++/81468 fix test for duration conversions\n \n PR libstdc++/81468\n * testsuite/20_util/duration/cons/dr1177.cc: Fix incorrect test and\n improve static assertion messages.\n\ndiff --git a/libstdc++-v3/testsuite/20_util/duration/cons/dr1177.cc b/libstdc++-v3/testsuite/20_util/duration/cons/dr1177.cc\nindex 28c881ccc79..d90cd27f482 100644\n--- a/libstdc++-v3/testsuite/20_util/duration/cons/dr1177.cc\n+++ b/libstdc++-v3/testsuite/20_util/duration/cons/dr1177.cc\n@@ -36,6 +36,6 @@ static_assert(is_constructible, duration>{},\n static_assert(!is_constructible, duration>>{},\n \"cannot convert duration to one with different period\");\n static_assert(is_constructible, duration>>{},\n- \"unless it has a floating-point representation\");\n-static_assert(is_constructible, duration>>{},\n- \"or a period that is an integral multiple of the original\");\n+ \"... unless the result type has a floating-point representation\");\n+static_assert(is_constructible>, duration>{},\n+ \"... or the original's period is a multiple of the result's period\");","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":["patchwork-incoming@bilbo.ozlabs.org","mailing list gcc-patches@gcc.gnu.org"],"Authentication-Results":["ozlabs.org;\n\tspf=pass (mailfrom) smtp.mailfrom=gcc.gnu.org\n\t(client-ip=209.132.180.131; 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