1 //===----------------------------------------------------------------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is dual licensed under the MIT and the University of Illinois Open 6 // Source Licenses. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 // UNSUPPORTED: c++98, c++03, c++11, c++14 11 // type_traits 12 13 // template<class B> struct negation; // C++17 14 // template<class B> 15 // constexpr bool negation_v = negation<B>::value; // C++17 16 17 #include <type_traits> 18 #include <cassert> 19 20 struct True { static constexpr bool value = true; }; 21 struct False { static constexpr bool value = false; }; 22 23 int main() 24 { 25 static_assert (!std::negation<std::true_type >::value, "" ); 26 static_assert ( std::negation<std::false_type>::value, "" ); 27 28 static_assert (!std::negation_v<std::true_type >, "" ); 29 static_assert ( std::negation_v<std::false_type>, "" ); 30 31 static_assert (!std::negation<True >::value, "" ); 32 static_assert ( std::negation<False>::value, "" ); 33 34 static_assert (!std::negation_v<True >, "" ); 35 static_assert ( std::negation_v<False>, "" ); 36 37 static_assert ( std::negation<std::negation<std::true_type >>::value, "" ); 38 static_assert (!std::negation<std::negation<std::false_type>>::value, "" ); 39 } 40
