53 lines
2.1 KiB
C++
53 lines
2.1 KiB
C++
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#include <functional>
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#include <string>
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template <class _Tp>
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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 _Up> static __two __test(...);
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template <class _Up> static char __test(typename _Up::is_transparent* = 0);
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public:
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static const bool value = sizeof(__test<_Tp>(0)) == 1;
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};
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int main () {
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#if _LIBCPP_STD_VER > 11
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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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#endif
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return 0;
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}
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