1 //===----------------------------------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 // type_traits 10 11 // is_const 12 13 #include <type_traits> 14 #include "test_macros.h" 15 16 template <class T> 17 void test_is_const() 18 { 19 static_assert(!std::is_const<T>::value, ""); 20 static_assert( std::is_const<const T>::value, ""); 21 static_assert(!std::is_const<volatile T>::value, ""); 22 static_assert( std::is_const<const volatile T>::value, ""); 23 #if TEST_STD_VER > 14 24 static_assert(!std::is_const_v<T>, ""); 25 static_assert( std::is_const_v<const T>, ""); 26 static_assert(!std::is_const_v<volatile T>, ""); 27 static_assert( std::is_const_v<const volatile T>, ""); 28 #endif 29 } 30 31 struct A; // incomplete 32 33 int main(int, char**) 34 { 35 test_is_const<void>(); 36 test_is_const<int>(); 37 test_is_const<double>(); 38 test_is_const<int*>(); 39 test_is_const<const int*>(); 40 test_is_const<char[3]>(); 41 test_is_const<char[]>(); 42 43 test_is_const<A>(); 44 45 static_assert(!std::is_const<int&>::value, ""); 46 static_assert(!std::is_const<const int&>::value, ""); 47 48 return 0; 49 } 50