valueless_by_exception.pass.cpp (1256B)
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 ...Types> class variant; 16 17 // constexpr bool valueless_by_exception() const noexcept; 18 19 #include <cassert> 20 #include <string> 21 #include <type_traits> 22 #include <variant> 23 24 #include "archetypes.hpp" 25 #include "test_macros.h" 26 #include "variant_test_helpers.hpp" 27 28 29 int main() { 30 { 31 using V = std::variant<int, long>; 32 constexpr V v; 33 static_assert(!v.valueless_by_exception(), ""); 34 } 35 { 36 using V = std::variant<int, long>; 37 V v; 38 assert(!v.valueless_by_exception()); 39 } 40 { 41 using V = std::variant<int, long, std::string>; 42 const V v("abc"); 43 assert(!v.valueless_by_exception()); 44 } 45 #ifndef TEST_HAS_NO_EXCEPTIONS 46 { 47 using V = std::variant<int, MakeEmptyT>; 48 V v; 49 assert(!v.valueless_by_exception()); 50 makeEmpty(v); 51 assert(v.valueless_by_exception()); 52 } 53 #endif 54 }