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chrono (duration<>::duration(const duration<>&)): Fix per the straightforward resolution of DR 974. 

2009-10-26  Paolo Carlini  <paolo.carlini@oracle.com>

	* include/std/chrono (duration<>::duration(const duration<>&)): Fix
	per the straightforward resolution of DR 974.
	* testsuite/20_util/duration/cons/dr974.cc: Add.

From-SVN: r153581
This commit is contained in:
Paolo Carlini 2009-10-27 01:18:10 +00:00 committed by Paolo Carlini
parent 42302b8582
commit 9c67ec2204
3 changed files with 45 additions and 1 deletions
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6
libstdc++-v3/ChangeLog
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@ -1,3 +1,9 @@
2009-10-26 Paolo Carlini <paolo.carlini@oracle.com>
* include/std/chrono (duration<>::duration(const duration<>&)): Fix
per the straightforward resolution of DR 974.
* testsuite/20_util/duration/cons/dr974.cc: Add.
2009-10-26 Jakub Jelinek <jakub@redhat.com>
PR libstdc++/38923

3
libstdc++-v3/include/std/chrono
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@ -225,7 +225,8 @@ namespace std
: __r(duration_cast<duration>(__d).count())
{
static_assert(treat_as_floating_point<rep>::value == true
|| ratio_divide<_Period2, period>::type::den == 1,
|| (ratio_divide<_Period2, period>::type::den == 1
&& !treat_as_floating_point<_Rep2>::value),
"the resulting duration is not exactly representable");
}

37
libstdc++-v3/testsuite/20_util/duration/cons/dr974.cc Normal file
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@ -0,0 +1,37 @@
// { dg-do compile }
// { dg-options "-std=gnu++0x" }
// { dg-require-cstdint "" }
// Copyright (C) 2009 Free Software Foundation
//
// 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/>.
// 20.8.3.1 duration constructors [time.duration.cons]
#include <chrono>
// DR 974.
void test01()
{
using namespace std::chrono;
duration<double> d(3.5);
duration<int> i = d; // implicit truncation, should not compile
}
// { dg-error "instantiated from here" "" { target *-*-* } 32 }
// { dg-error "not exactly representable" "" { target *-*-* } 227 }
// { dg-excess-errors "In instantiation of" }