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 // <optional> 11 12 // template <class U> optional<T>& operator=(U&& v); 13 14 #include <experimental/optional> 15 #include <type_traits> 16 #include <cassert> 17 #include <memory> 18 19 #if _LIBCPP_STD_VER > 11 20 21 using std::experimental::optional; 22 23 struct X 24 { 25 }; 26 27 #endif // _LIBCPP_STD_VER > 11 28 29 int main() 30 { 31 #if _LIBCPP_STD_VER > 11 32 static_assert(std::is_assignable<optional<int>, int>::value, ""); 33 static_assert(std::is_assignable<optional<int>, int&>::value, ""); 34 static_assert(std::is_assignable<optional<int>&, int>::value, ""); 35 static_assert(std::is_assignable<optional<int>&, int&>::value, ""); 36 static_assert(std::is_assignable<optional<int>&, const int&>::value, ""); 37 static_assert(!std::is_assignable<const optional<int>&, const int&>::value, ""); 38 static_assert(!std::is_assignable<optional<int>, X>::value, ""); 39 { 40 optional<int> opt; 41 opt = 1; 42 assert(static_cast<bool>(opt) == true); 43 assert(*opt == 1); 44 } 45 { 46 optional<int> opt; 47 const int i = 2; 48 opt = i; 49 assert(static_cast<bool>(opt) == true); 50 assert(*opt == i); 51 } 52 { 53 optional<int> opt(3); 54 const int i = 2; 55 opt = i; 56 assert(static_cast<bool>(opt) == true); 57 assert(*opt == i); 58 } 59 { 60 optional<std::unique_ptr<int>> opt; 61 opt = std::unique_ptr<int>(new int(3)); 62 assert(static_cast<bool>(opt) == true); 63 assert(**opt == 3); 64 } 65 { 66 optional<std::unique_ptr<int>> opt(std::unique_ptr<int>(new int(2))); 67 opt = std::unique_ptr<int>(new int(3)); 68 assert(static_cast<bool>(opt) == true); 69 assert(**opt == 3); 70 } 71 #endif // _LIBCPP_STD_VER > 11 72 } 73
