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 // <optional> 12 13 // constexpr optional(nullopt_t) noexcept; 14 15 #include <optional> 16 #include <type_traits> 17 #include <cassert> 18 19 #include "archetypes.hpp" 20 21 using std::optional; 22 using std::nullopt_t; 23 using std::nullopt; 24 25 template <class Opt> 26 void 27 test_constexpr() 28 { 29 static_assert(std::is_nothrow_constructible<Opt, nullopt_t&>::value, ""); 30 static_assert(std::is_trivially_destructible<Opt>::value, ""); 31 static_assert(std::is_trivially_destructible<typename Opt::value_type>::value, ""); 32 33 constexpr Opt opt(nullopt); 34 static_assert(static_cast<bool>(opt) == false, ""); 35 36 struct test_constexpr_ctor 37 : public Opt 38 { 39 constexpr test_constexpr_ctor() {} 40 }; 41 } 42 43 template <class Opt> 44 void 45 test() 46 { 47 static_assert(std::is_nothrow_constructible<Opt, nullopt_t&>::value, ""); 48 static_assert(!std::is_trivially_destructible<Opt>::value, ""); 49 static_assert(!std::is_trivially_destructible<typename Opt::value_type>::value, ""); 50 { 51 Opt opt(nullopt); 52 assert(static_cast<bool>(opt) == false); 53 } 54 { 55 const Opt opt(nullopt); 56 assert(static_cast<bool>(opt) == false); 57 } 58 struct test_constexpr_ctor 59 : public Opt 60 { 61 constexpr test_constexpr_ctor() {} 62 }; 63 } 64 65 int main() 66 { 67 test_constexpr<optional<int>>(); 68 test_constexpr<optional<int*>>(); 69 test_constexpr<optional<ImplicitTypes::NoCtors>>(); 70 test_constexpr<optional<NonTrivialTypes::NoCtors>>(); 71 test_constexpr<optional<NonConstexprTypes::NoCtors>>(); 72 test<optional<NonLiteralTypes::NoCtors>>(); 73 } 74
