is_default_constructible.pass.cpp revision 933afa9761c1c1f916161278a99284d50a594939
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// is_default_constructible 13 14#include <type_traits> 15 16template <class T> 17void test_is_default_constructible() 18{ 19 static_assert( std::is_default_constructible<T>::value, ""); 20 static_assert( std::is_default_constructible<const T>::value, ""); 21 static_assert( std::is_default_constructible<volatile T>::value, ""); 22 static_assert( std::is_default_constructible<const volatile T>::value, ""); 23} 24 25template <class T> 26void test_is_not_default_constructible() 27{ 28 static_assert(!std::is_default_constructible<T>::value, ""); 29 static_assert(!std::is_default_constructible<const T>::value, ""); 30 static_assert(!std::is_default_constructible<volatile T>::value, ""); 31 static_assert(!std::is_default_constructible<const volatile T>::value, ""); 32} 33 34class Empty 35{ 36}; 37 38class NotEmpty 39{ 40public: 41 virtual ~NotEmpty(); 42}; 43 44union Union {}; 45 46struct bit_zero 47{ 48 int : 0; 49}; 50 51class Abstract 52{ 53public: 54 virtual ~Abstract() = 0; 55}; 56 57struct A 58{ 59 A(); 60}; 61 62class B 63{ 64 B(); 65}; 66 67int main() 68{ 69 test_is_default_constructible<A>(); 70 test_is_default_constructible<Union>(); 71 test_is_default_constructible<Empty>(); 72 test_is_default_constructible<int>(); 73 test_is_default_constructible<double>(); 74 test_is_default_constructible<int*>(); 75 test_is_default_constructible<const int*>(); 76 test_is_default_constructible<char[3]>(); 77 test_is_default_constructible<NotEmpty>(); 78 test_is_default_constructible<bit_zero>(); 79 80 test_is_not_default_constructible<void>(); 81 test_is_not_default_constructible<int&>(); 82 test_is_not_default_constructible<char[]>(); 83 test_is_not_default_constructible<Abstract>(); 84#if __has_feature(cxx_access_control_sfinae) 85 test_is_not_default_constructible<B>(); 86#endif 87} 88