make_optional.pass.cpp (1587B)
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 // XFAIL: availability=macosx10.13 14 // XFAIL: availability=macosx10.12 15 // XFAIL: availability=macosx10.11 16 // XFAIL: availability=macosx10.10 17 // XFAIL: availability=macosx10.9 18 // XFAIL: availability=macosx10.8 19 // XFAIL: availability=macosx10.7 20 21 // template <class T> 22 // constexpr optional<decay_t<T>> make_optional(T&& v); 23 24 #include <optional> 25 #include <string> 26 #include <memory> 27 #include <cassert> 28 29 #include "test_macros.h" 30 31 int main() 32 { 33 using std::optional; 34 using std::make_optional; 35 { 36 int arr[10]; ((void)arr); 37 ASSERT_SAME_TYPE(decltype(make_optional(arr)), optional<int*>); 38 } 39 { 40 constexpr auto opt = make_optional(2); 41 ASSERT_SAME_TYPE(decltype(opt), const optional<int>); 42 static_assert(opt.value() == 2); 43 } 44 { 45 optional<int> opt = make_optional(2); 46 assert(*opt == 2); 47 } 48 { 49 std::string s("123"); 50 optional<std::string> opt = make_optional(s); 51 assert(*opt == s); 52 } 53 { 54 std::unique_ptr<int> s(new int(3)); 55 optional<std::unique_ptr<int>> opt = make_optional(std::move(s)); 56 assert(**opt == 3); 57 assert(s == nullptr); 58 } 59 }