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60 lines
2.4 KiB
60 lines
2.4 KiB
4 months ago
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//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: c++98, c++03, c++11
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#include <functional>
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#include <string>
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template <class T>
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struct is_transparent
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{
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private:
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struct two {char lx; char lxx;};
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template <class U> static two test(...);
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template <class U> static char test(typename U::is_transparent* = 0);
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public:
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static const bool value = sizeof(test<T>(0)) == 1;
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};
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int main ()
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{
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static_assert ( !is_transparent<std::less<int>>::value, "" );
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static_assert ( !is_transparent<std::less<std::string>>::value, "" );
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static_assert ( is_transparent<std::less<void>>::value, "" );
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static_assert ( is_transparent<std::less<>>::value, "" );
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static_assert ( !is_transparent<std::less_equal<int>>::value, "" );
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static_assert ( !is_transparent<std::less_equal<std::string>>::value, "" );
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static_assert ( is_transparent<std::less_equal<void>>::value, "" );
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static_assert ( is_transparent<std::less_equal<>>::value, "" );
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static_assert ( !is_transparent<std::equal_to<int>>::value, "" );
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static_assert ( !is_transparent<std::equal_to<std::string>>::value, "" );
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static_assert ( is_transparent<std::equal_to<void>>::value, "" );
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static_assert ( is_transparent<std::equal_to<>>::value, "" );
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static_assert ( !is_transparent<std::not_equal_to<int>>::value, "" );
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static_assert ( !is_transparent<std::not_equal_to<std::string>>::value, "" );
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static_assert ( is_transparent<std::not_equal_to<void>>::value, "" );
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static_assert ( is_transparent<std::not_equal_to<>>::value, "" );
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static_assert ( !is_transparent<std::greater<int>>::value, "" );
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static_assert ( !is_transparent<std::greater<std::string>>::value, "" );
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static_assert ( is_transparent<std::greater<void>>::value, "" );
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static_assert ( is_transparent<std::greater<>>::value, "" );
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static_assert ( !is_transparent<std::greater_equal<int>>::value, "" );
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static_assert ( !is_transparent<std::greater_equal<std::string>>::value, "" );
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static_assert ( is_transparent<std::greater_equal<void>>::value, "" );
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static_assert ( is_transparent<std::greater_equal<>>::value, "" );
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return 0;
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}
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