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 // <functional> 11 12 // struct is_placeholder 13 14 #include <functional> 15 #include "test_macros.h" 16 17 template <int Expected, class T> 18 void 19 test(const T&) 20 { 21 static_assert(std::is_placeholder<T>::value == Expected, ""); 22 #if TEST_STD_VER > 14 23 static_assert(std::is_placeholder_v<T> == Expected, ""); 24 #endif 25 } 26 27 struct C {}; 28 29 int main() 30 { 31 test<1>(std::placeholders::_1); 32 test<2>(std::placeholders::_2); 33 test<3>(std::placeholders::_3); 34 test<4>(std::placeholders::_4); 35 test<5>(std::placeholders::_5); 36 test<6>(std::placeholders::_6); 37 test<7>(std::placeholders::_7); 38 test<8>(std::placeholders::_8); 39 test<9>(std::placeholders::_9); 40 test<10>(std::placeholders::_10); 41 test<0>(4); 42 test<0>(5.5); 43 test<0>('a'); 44 test<0>(C()); 45 } 46
