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 // void reset() noexcept; 15 16 #include <optional> 17 #include <type_traits> 18 #include <cassert> 19 20 using std::optional; 21 22 struct X 23 { 24 static bool dtor_called; 25 ~X() {dtor_called = true;} 26 }; 27 28 bool X::dtor_called = false; 29 30 int main() 31 { 32 { 33 optional<int> opt; 34 static_assert(noexcept(opt.reset()) == true, ""); 35 opt.reset(); 36 assert(static_cast<bool>(opt) == false); 37 } 38 { 39 optional<int> opt(3); 40 opt.reset(); 41 assert(static_cast<bool>(opt) == false); 42 } 43 { 44 optional<X> opt; 45 static_assert(noexcept(opt.reset()) == true, ""); 46 assert(X::dtor_called == false); 47 opt.reset(); 48 assert(X::dtor_called == false); 49 assert(static_cast<bool>(opt) == false); 50 } 51 { 52 optional<X> opt(X{}); 53 X::dtor_called = false; 54 opt.reset(); 55 assert(X::dtor_called == true); 56 assert(static_cast<bool>(opt) == false); 57 X::dtor_called = false; 58 } 59 } 60
