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 // type_traits 11 12 // integral_constant 13 14 #include <type_traits> 15 #include <cassert> 16 17 int main() 18 { 19 typedef std::integral_constant<int, 5> _5; 20 static_assert(_5::value == 5, ""); 21 static_assert((std::is_same<_5::value_type, int>::value), ""); 22 static_assert((std::is_same<_5::type, _5>::value), ""); 23 #ifndef _LIBCPP_HAS_NO_CONSTEXPR 24 static_assert((_5() == 5), ""); 25 #else 26 assert(_5() == 5); 27 #endif 28 29 #if _LIBCPP_STD_VER > 11 30 static_assert ( _5{}() == 5, "" ); 31 static_assert ( std::true_type{}(), "" ); 32 #endif 33 34 static_assert(std::false_type::value == false, ""); 35 static_assert((std::is_same<std::false_type::value_type, bool>::value), ""); 36 static_assert((std::is_same<std::false_type::type, std::false_type>::value), ""); 37 38 static_assert(std::true_type::value == true, ""); 39 static_assert((std::is_same<std::true_type::value_type, bool>::value), ""); 40 static_assert((std::is_same<std::true_type::type, std::true_type>::value), ""); 41 42 std::false_type f1; 43 std::false_type f2 = f1; 44 assert(!f2); 45 46 std::true_type t1; 47 std::true_type t2 = t1; 48 assert(t2); 49 } 50
