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PR libstdc++/81468 constrain std::chrono::time_point constructor

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PR libstdc++/81468
	* include/std/chrono (time_point(const time_point<_Dur2>&)): Add
	missing constraint from LWG DR 1177.
	* testsuite/20_util/duration/cons/dr1177.cc: New.
	* testsuite/20_util/time_point/cons/81468.cc: New.
	* testsuite/20_util/duration/literals/range.cc: Update dg-error line.

From-SVN: r252090
This commit is contained in:
Jonathan Wakely 2017-09-13 16:20:21 +01:00 committed by Jonathan Wakely
parent 61068cc174
commit c2f99c9d9a
5 changed files with 85 additions and 2 deletions
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7
libstdc++-v3/ChangeLog
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@ -1,5 +1,12 @@
2017-09-13 Jonathan Wakely <jwakely@redhat.com>
PR libstdc++/81468
* include/std/chrono (time_point(const time_point<_Dur2>&)): Add
missing constraint from LWG DR 1177.
* testsuite/20_util/duration/cons/dr1177.cc: New.
* testsuite/20_util/time_point/cons/81468.cc: New.
* testsuite/20_util/duration/literals/range.cc: Update dg-error line.
* doc/doxygen/mainpage.html: Fix broken URLs.
PR libstdc++/81835

3
libstdc++-v3/include/std/chrono
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@ -622,7 +622,8 @@ _GLIBCXX_END_NAMESPACE_VERSION
{ }
// conversions
template<typename _Dur2>
template<typename _Dur2,
typename = _Require<is_convertible<_Dur2, _Dur>>>
constexpr time_point(const time_point<clock, _Dur2>& __t)
: __d(__t.time_since_epoch())
{ }

41
libstdc++-v3/testsuite/20_util/duration/cons/dr1177.cc Normal file
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@ -0,0 +1,41 @@
// Copyright (C) 2017 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
// { dg-do compile { target c++11 } }
#include <chrono>
#include <type_traits>
using namespace std;
using namespace std::chrono;
// DR 1177
static_assert(is_constructible<duration<float>, duration<double>>{},
"can convert duration with one floating point rep to another");
static_assert(is_constructible<duration<float>, duration<int>>{},
"can convert duration with integral rep to one with floating point rep");
static_assert(!is_constructible<duration<int>, duration<float>>{},
"cannot convert duration with floating point rep to one with integral rep");
static_assert(is_constructible<duration<int>, duration<long>>{},
"can convert duration with one integral rep to another");
static_assert(!is_constructible<duration<int>, duration<int, ratio<2,3>>>{},
"cannot convert duration to one with different period");
static_assert(is_constructible<duration<float>, duration<int, ratio<2,3>>>{},
"unless it has a floating-point representation");
static_assert(is_constructible<duration<float>, duration<int, ratio<1,3>>>{},
"or a period that is an integral multiple of the original");

2
libstdc++-v3/testsuite/20_util/duration/literals/range.cc
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@ -26,6 +26,6 @@ test01()
// std::numeric_limits<int64_t>::max() == 9223372036854775807;
auto h = 9223372036854775808h;
// { dg-error "cannot be represented" "" { target *-*-* } 892 }
// { dg-error "cannot be represented" "" { target *-*-* } 893 }
}
// { dg-prune-output "in constexpr expansion" } // needed for -O0

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libstdc++-v3/testsuite/20_util/time_point/cons/81468.cc Normal file
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@ -0,0 +1,34 @@
// Copyright (C) 2017 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
// { dg-do compile { target c++11 } }
#include <chrono>
#include <type_traits>
using namespace std;
using namespace std::chrono;
template <class Duration>
using sys_time = time_point<system_clock, Duration>;
static_assert(is_constructible<sys_time<milliseconds>, sys_time<seconds>>{},
"Can construct time_point from one with lower precision duration");
// PR libstdc++/81468 - DR 1177
static_assert(!is_constructible<sys_time<seconds>, sys_time<milliseconds>>{},
"Cannot construct time_point from one with higher precision duration");