1 // -*- C++ -*- 2 //===----------------------------------------------------------------------===// 3 // 4 // The LLVM Compiler Infrastructure 5 // 6 // This file is dual licensed under the MIT and the University of Illinois Open 7 // Source Licenses. See LICENSE.TXT for details. 8 // 9 //===----------------------------------------------------------------------===// 10 11 // UNSUPPORTED: c++98, c++03, c++11, c++14 12 13 // <variant> 14 15 // template <class T, class... Types> 16 // constexpr bool holds_alternative(const variant<Types...>& v) noexcept; 17 18 #include "test_macros.h" 19 #include <variant> 20 main()21int main() { 22 { 23 using V = std::variant<int>; 24 constexpr V v; 25 static_assert(std::holds_alternative<int>(v), ""); 26 } 27 { 28 using V = std::variant<int, long>; 29 constexpr V v; 30 static_assert(std::holds_alternative<int>(v), ""); 31 static_assert(!std::holds_alternative<long>(v), ""); 32 } 33 { // noexcept test 34 using V = std::variant<int>; 35 const V v; 36 ASSERT_NOEXCEPT(std::holds_alternative<int>(v)); 37 } 38 } 39