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 // REQUIRES: c++11
11
12 // <utility>
13
14 // Test that only the default constructor is constexpr in C++11
15
16 #include <utility>
17 #include <cassert>
18
19 struct ExplicitT {
ExplicitTExplicitT20 constexpr explicit ExplicitT(int x) : value(x) {}
ExplicitTExplicitT21 constexpr explicit ExplicitT(ExplicitT const& o) : value(o.value) {}
22 int value;
23 };
24
25 struct ImplicitT {
ImplicitTImplicitT26 constexpr ImplicitT(int x) : value(x) {}
ImplicitTImplicitT27 constexpr ImplicitT(ImplicitT const& o) : value(o.value) {}
28 int value;
29 };
30
main()31 int main()
32 {
33 {
34 using P = std::pair<int, int>;
35 constexpr int x = 42;
36 constexpr P default_p{};
37 constexpr P copy_p(default_p);
38 constexpr P const_U_V(x, x); // expected-error {{must be initialized by a constant expression}}
39 constexpr P U_V(42, 101); // expected-error {{must be initialized by a constant expression}}
40 }
41 {
42 using P = std::pair<ExplicitT, ExplicitT>;
43 constexpr std::pair<int, int> other;
44 constexpr ExplicitT e(99);
45 constexpr P const_U_V(e, e); // expected-error {{must be initialized by a constant expression}}
46 constexpr P U_V(42, 101); // expected-error {{must be initialized by a constant expression}}
47 constexpr P pair_U_V(other); // expected-error {{must be initialized by a constant expression}}
48 }
49 {
50 using P = std::pair<ImplicitT, ImplicitT>;
51 constexpr std::pair<int, int> other;
52 constexpr ImplicitT i = 99;
53 constexpr P const_U_V = {i, i}; // expected-error {{must be initialized by a constant expression}}
54 constexpr P U_V = {42, 101}; // expected-error {{must be initialized by a constant expression}}
55 constexpr P pair_U_V = other; // expected-error {{must be initialized by a constant expression}}
56 }
57 }
58