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 { 20 constexpr explicit ExplicitT(int x) : value(x) {} 21 constexpr explicit ExplicitT(ExplicitT const& o) : value(o.value) {} 22 int value; 23 }; 24 25 struct ImplicitT { 26 constexpr ImplicitT(int x) : value(x) {} 27 constexpr ImplicitT(ImplicitT const& o) : value(o.value) {} 28 int value; 29 }; 30 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
