7274deff73
2009-11-12 Paolo Carlini <paolo.carlini@oracle.com> * include/std/type_traits (declval): Add, per DR 1255. (__is_convertible_helper, common_type): Use it. * include/bits/move.h: Mention std::declval. * testsuite/20_util/declval/requirements/1.cc: New. * testsuite/20_util/declval/requirements/1_neg.cc: Likewise. * testsuite/20_util/common_type/requirements/typedefs-2.cc: Likewise. * testsuite/20_util/common_type/requirements/ explicit_instantiation.cc: Extend. * testsuite/20_util/make_signed/requirements/typedefs_neg.cc: Adjust dg-error line numbers. * testsuite/20_util/make_unsigned/requirements/typedefs_neg.cc: Likewise. From-SVN: r154140
50 lines
1.7 KiB
C++
50 lines
1.7 KiB
C++
// { dg-options "-std=gnu++0x" }
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// { dg-do compile }
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// 2009-11-12 Paolo Carlini <paolo.carlini@oracle.com>
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//
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// Copyright (C) 2009 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License along
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// with this library; see the file COPYING3. If not see
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// <http://www.gnu.org/licenses/>.
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#include <utility>
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template<typename From, typename To>
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struct is_convertible_mini
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{
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private:
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typedef char one;
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typedef struct { char arr[2]; } two;
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static one test(To);
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static two test(...);
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public:
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static const bool value = sizeof(test(std::declval<From>())) == 1;
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};
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template<typename From, typename To>
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const bool is_convertible_mini<From, To>::value;
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void test01()
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{
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static_assert(is_convertible_mini<int*, const int*>::value, "#1");
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static_assert(!is_convertible_mini<const void*, void*>::value, "#2");
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static_assert(is_convertible_mini<float, double>::value, "#3");
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static_assert(!is_convertible_mini<bool, int*>::value, "#4");
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static_assert(is_convertible_mini<int(&)(int), int(*)(int)>::value, "#5");
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static_assert(!is_convertible_mini<void*, int*>::value, "#6");
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}
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