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N3887 Consistent Metafunction Aliases 

* include/std/tuple (tuple_element_t): Define.
	* testsuite/20_util/tuple/tuple_element.cc: Change to compile-only
	test.
	* testsuite/20_util/tuple/tuple_element_t.cc: New.

From-SVN: r209395
This commit is contained in:
Jonathan Wakely 2014-04-15 00:17:52 +01:00 committed by Jonathan Wakely
parent 7035307e8f
commit 025eac9b9e
4 changed files with 48 additions and 1 deletions
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5
libstdc++-v3/ChangeLog
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@ -13,6 +13,11 @@
* include/std/tuple (get): Qualify calls to prevent ADL.
* testsuite/20_util/tuple/60497.cc: New.
* include/std/tuple (tuple_element_t): Define.
* testsuite/20_util/tuple/tuple_element.cc: Change to compile-only
test.
* testsuite/20_util/tuple/tuple_element_t.cc: New.
2014-04-11 Marc Glisse <marc.glisse@inria.fr>
PR libstdc++/59434

5
libstdc++-v3/include/std/tuple
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@ -710,6 +710,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
add_cv<typename tuple_element<__i, _Tp>::type>::type type;
};
#if __cplusplus > 201103L
template<std::size_t __i, typename _Tp>
using tuple_element_t = typename tuple_element<__i, _Tp>::type;
#endif
/// Finds the size of a given tuple type.
template<typename _Tp>
struct tuple_size;

3
libstdc++-v3/testsuite/20_util/tuple/tuple_element.cc
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@ -1,4 +1,5 @@
// { dg-options "-std=gnu++0x" }
// { dg-options "-std=gnu++11" }
// { dg-do compile }
// Copyright (C) 2007-2014 Free Software Foundation, Inc.
//

36
libstdc++-v3/testsuite/20_util/tuple/tuple_element_t.cc Normal file
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@ -0,0 +1,36 @@
// { dg-options "-std=gnu++14" }
// { dg-do compile }
// Copyright (C) 2014 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/>.
#include <tuple>
using namespace std;
struct foo
{ };
int
main()
{
// As foo isn't constructible from anything else, this
// lets us check if the alias is returning foo when it should
foo q1;
tuple_element_t<0,tuple<foo,void,int> > q2(q1);
tuple_element_t<2,tuple<void,int,foo> > q3(q1);
}