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
14 #include <optional>
15 #include <type_traits>
16 #include <cassert>
17
18 #include "archetypes.hpp"
19
20 template <class T>
21 struct SpecialMemberTest {
22 using O = std::optional<T>;
23
24 static_assert(std::is_default_constructible_v<O>,
25 "optional is always default constructible.");
26 static_assert(std::is_copy_constructible_v<O> == std::is_copy_constructible_v<T>,
27 "optional<T> is copy constructible if and only if T is copy constructible.");
28 static_assert(std::is_move_constructible_v<O> ==
29 (std::is_copy_constructible_v<T> || std::is_move_constructible_v<T>),
30 "optional<T> is move constructible if and only if T is copy or move constructible.");
31 static_assert(std::is_copy_assignable_v<O> ==
32 (std::is_copy_constructible_v<T> && std::is_copy_assignable_v<T>),
33 "optional<T> is copy assignable if and only if T is both copy "
34 "constructible and copy assignable.");
35 static_assert(std::is_move_assignable_v<O> ==
36 ((std::is_copy_constructible_v<T> && std::is_copy_assignable_v<T>) ||
37 (std::is_move_constructible_v<T> && std::is_move_assignable_v<T>)),
38 "optional<T> is move assignable if and only if T is both move assignable and "
39 "move constructible, or both copy constructible and copy assignable.");
40 };
41
sink(Args &&...)42 template <class ...Args> static void sink(Args&&...) {}
43
44 template <class ...TestTypes>
45 struct DoTestsMetafunction {
DoTestsMetafunctionDoTestsMetafunction46 DoTestsMetafunction() { sink(SpecialMemberTest<TestTypes>{}...); }
47 };
48
49 struct TrivialMoveNonTrivialCopy {
50 TrivialMoveNonTrivialCopy() = default;
TrivialMoveNonTrivialCopyTrivialMoveNonTrivialCopy51 TrivialMoveNonTrivialCopy(const TrivialMoveNonTrivialCopy&) {}
52 TrivialMoveNonTrivialCopy(TrivialMoveNonTrivialCopy&&) = default;
operator =TrivialMoveNonTrivialCopy53 TrivialMoveNonTrivialCopy& operator=(const TrivialMoveNonTrivialCopy&) { return *this; }
54 TrivialMoveNonTrivialCopy& operator=(TrivialMoveNonTrivialCopy&&) = default;
55 };
56
57 struct TrivialCopyNonTrivialMove {
58 TrivialCopyNonTrivialMove() = default;
59 TrivialCopyNonTrivialMove(const TrivialCopyNonTrivialMove&) = default;
TrivialCopyNonTrivialMoveTrivialCopyNonTrivialMove60 TrivialCopyNonTrivialMove(TrivialCopyNonTrivialMove&&) {}
61 TrivialCopyNonTrivialMove& operator=(const TrivialCopyNonTrivialMove&) = default;
operator =TrivialCopyNonTrivialMove62 TrivialCopyNonTrivialMove& operator=(TrivialCopyNonTrivialMove&&) { return *this; }
63 };
64
main()65 int main()
66 {
67 sink(
68 ImplicitTypes::ApplyTypes<DoTestsMetafunction>{},
69 ExplicitTypes::ApplyTypes<DoTestsMetafunction>{},
70 NonLiteralTypes::ApplyTypes<DoTestsMetafunction>{},
71 NonTrivialTypes::ApplyTypes<DoTestsMetafunction>{},
72 DoTestsMetafunction<TrivialMoveNonTrivialCopy, TrivialCopyNonTrivialMove>{}
73 );
74 }
75