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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++98, c++03, c++11
#include <functional>
#include <string>
template <class T>
struct is_transparent
{
private:
struct two {char lx; char lxx;};
template <class U> static two test(...);
template <class U> static char test(typename U::is_transparent* = 0);
public:
static const bool value = sizeof(test<T>(0)) == 1;
};
int main(int, char**)
{
static_assert ( !is_transparent<std::less<int>>::value, "" );
static_assert ( !is_transparent<std::less<std::string>>::value, "" );
static_assert ( is_transparent<std::less<void>>::value, "" );
static_assert ( is_transparent<std::less<>>::value, "" );
static_assert ( !is_transparent<std::less_equal<int>>::value, "" );
static_assert ( !is_transparent<std::less_equal<std::string>>::value, "" );
static_assert ( is_transparent<std::less_equal<void>>::value, "" );
static_assert ( is_transparent<std::less_equal<>>::value, "" );
static_assert ( !is_transparent<std::equal_to<int>>::value, "" );
static_assert ( !is_transparent<std::equal_to<std::string>>::value, "" );
static_assert ( is_transparent<std::equal_to<void>>::value, "" );
static_assert ( is_transparent<std::equal_to<>>::value, "" );
static_assert ( !is_transparent<std::not_equal_to<int>>::value, "" );
static_assert ( !is_transparent<std::not_equal_to<std::string>>::value, "" );
static_assert ( is_transparent<std::not_equal_to<void>>::value, "" );
static_assert ( is_transparent<std::not_equal_to<>>::value, "" );
static_assert ( !is_transparent<std::greater<int>>::value, "" );
static_assert ( !is_transparent<std::greater<std::string>>::value, "" );
static_assert ( is_transparent<std::greater<void>>::value, "" );
static_assert ( is_transparent<std::greater<>>::value, "" );
static_assert ( !is_transparent<std::greater_equal<int>>::value, "" );
static_assert ( !is_transparent<std::greater_equal<std::string>>::value, "" );
static_assert ( is_transparent<std::greater_equal<void>>::value, "" );
static_assert ( is_transparent<std::greater_equal<>>::value, "" );
return 0;
}
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