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_empty 13 14#include <type_traits> 15 16template <class T> 17void test_is_empty() 18{ 19 static_assert( std::is_empty<T>::value, ""); 20 static_assert( std::is_empty<const T>::value, ""); 21 static_assert( std::is_empty<volatile T>::value, ""); 22 static_assert( std::is_empty<const volatile T>::value, ""); 23} 24 25template <class T> 26void test_is_not_empty() 27{ 28 static_assert(!std::is_empty<T>::value, ""); 29 static_assert(!std::is_empty<const T>::value, ""); 30 static_assert(!std::is_empty<volatile T>::value, ""); 31 static_assert(!std::is_empty<const volatile T>::value, ""); 32} 33 34class Empty 35{ 36}; 37 38class NotEmpty 39{ 40 virtual ~NotEmpty(); 41}; 42 43union Union {}; 44 45struct bit_zero 46{ 47 int : 0; 48}; 49 50int main() 51{ 52 test_is_not_empty<void>(); 53 test_is_not_empty<int&>(); 54 test_is_not_empty<int>(); 55 test_is_not_empty<double>(); 56 test_is_not_empty<int*>(); 57 test_is_not_empty<const int*>(); 58 test_is_not_empty<char[3]>(); 59 test_is_not_empty<char[3]>(); 60 test_is_not_empty<Union>(); 61 test_is_not_empty<NotEmpty>(); 62 63 test_is_empty<Empty>(); 64 test_is_empty<bit_zero>(); 65} 66