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 // UNSUPPORTED: c++98, c++03, c++11, c++14 11 12 // <optional> 13 14 // constexpr optional(const T& v); 15 16 #include <optional> 17 #include <type_traits> 18 #include <cassert> 19 20 #include "test_macros.h" 21 #include "archetypes.hpp" 22 23 using std::optional; 24 25 int main() 26 { 27 { 28 typedef int T; 29 constexpr T t(5); 30 constexpr optional<T> opt(t); 31 static_assert(static_cast<bool>(opt) == true, ""); 32 static_assert(*opt == 5, ""); 33 34 struct test_constexpr_ctor 35 : public optional<T> 36 { 37 constexpr test_constexpr_ctor(const T&) {} 38 }; 39 40 } 41 { 42 typedef double T; 43 constexpr T t(3); 44 constexpr optional<T> opt(t); 45 static_assert(static_cast<bool>(opt) == true, ""); 46 static_assert(*opt == 3, ""); 47 48 struct test_constexpr_ctor 49 : public optional<T> 50 { 51 constexpr test_constexpr_ctor(const T&) {} 52 }; 53 54 } 55 { 56 const int x = 42; 57 optional<const int> o(x); 58 assert(*o == x); 59 } 60 { 61 typedef TestTypes::TestType T; 62 T::reset(); 63 const T t(3); 64 optional<T> opt = t; 65 assert(T::alive == 2); 66 assert(T::copy_constructed == 1); 67 assert(static_cast<bool>(opt) == true); 68 assert(opt.value().value == 3); 69 } 70 { 71 typedef ExplicitTestTypes::TestType T; 72 static_assert(!std::is_convertible<T const&, optional<T>>::value, ""); 73 T::reset(); 74 const T t(3); 75 optional<T> opt(t); 76 assert(T::alive == 2); 77 assert(T::copy_constructed == 1); 78 assert(static_cast<bool>(opt) == true); 79 assert(opt.value().value == 3); 80 } 81 { 82 typedef ConstexprTestTypes::TestType T; 83 constexpr T t(3); 84 constexpr optional<T> opt = {t}; 85 static_assert(static_cast<bool>(opt) == true, ""); 86 static_assert(opt.value().value == 3, ""); 87 88 struct test_constexpr_ctor 89 : public optional<T> 90 { 91 constexpr test_constexpr_ctor(const T&) {} 92 }; 93 } 94 { 95 typedef ExplicitConstexprTestTypes::TestType T; 96 static_assert(!std::is_convertible<const T&, optional<T>>::value, ""); 97 constexpr T t(3); 98 constexpr optional<T> opt(t); 99 static_assert(static_cast<bool>(opt) == true, ""); 100 static_assert(opt.value().value == 3, ""); 101 102 struct test_constexpr_ctor 103 : public optional<T> 104 { 105 constexpr test_constexpr_ctor(const T&) {} 106 }; 107 108 } 109 #ifndef TEST_HAS_NO_EXCEPTIONS 110 { 111 struct Z { 112 Z(int) {} 113 Z(const Z&) {throw 6;} 114 }; 115 typedef Z T; 116 try 117 { 118 const T t(3); 119 optional<T> opt(t); 120 assert(false); 121 } 122 catch (int i) 123 { 124 assert(i == 6); 125 } 126 } 127 #endif 128 } 129