38 lines
1.3 KiB
C++
38 lines
1.3 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::logical_and<int>>::value, "" );
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static_assert ( !is_transparent<std::logical_and<std::string>>::value, "" );
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static_assert ( is_transparent<std::logical_and<void>>::value, "" );
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static_assert ( is_transparent<std::logical_and<>>::value, "" );
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static_assert ( !is_transparent<std::logical_or<int>>::value, "" );
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static_assert ( !is_transparent<std::logical_or<std::string>>::value, "" );
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static_assert ( is_transparent<std::logical_or<void>>::value, "" );
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static_assert ( is_transparent<std::logical_or<>>::value, "" );
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static_assert ( !is_transparent<std::logical_not<int>>::value, "" );
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static_assert ( !is_transparent<std::logical_not<std::string>>::value, "" );
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static_assert ( is_transparent<std::logical_not<void>>::value, "" );
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static_assert ( is_transparent<std::logical_not<>>::value, "" );
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#endif
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return 0;
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}
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