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 // <utility> 11 12 // template <class T1, class T2> struct pair 13 14 // constexpr pair(); 15 16 // This test doesn't pass due to a constexpr bug in GCC 4.9 that fails 17 // to initialize any type without a user provided constructor in a constant 18 // expression (e.g. float). 19 // XFAIL: gcc-4.9 20 21 // NOTE: The SFINAE on the default constructor is tested in 22 // default-sfinae.pass.cpp 23 24 25 #include <utility> 26 #include <type_traits> 27 #include <cassert> 28 29 #include "test_macros.h" 30 #include "archetypes.hpp" 31 32 int main() 33 { 34 { 35 typedef std::pair<float, short*> P; 36 P p; 37 assert(p.first == 0.0f); 38 assert(p.second == nullptr); 39 } 40 #if TEST_STD_VER >= 11 41 { 42 typedef std::pair<float, short*> P; 43 constexpr P p; 44 static_assert(p.first == 0.0f, ""); 45 static_assert(p.second == nullptr, ""); 46 } 47 { 48 using NoDefault = ImplicitTypes::NoDefault; 49 using P = std::pair<int, NoDefault>; 50 static_assert(!std::is_default_constructible<P>::value, ""); 51 using P2 = std::pair<NoDefault, int>; 52 static_assert(!std::is_default_constructible<P2>::value, ""); 53 } 54 #endif 55 } 56
