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 // <memory> 11 12 // template <class Alloc> 13 // struct allocator_traits 14 // { 15 // static allocator_type 16 // select_on_container_copy_construction(const allocator_type& a); 17 // ... 18 // }; 19 20 #include <memory> 21 #include <new> 22 #include <type_traits> 23 #include <cassert> 24 25 template <class T> 26 struct A 27 { 28 typedef T value_type; 29 int id; 30 explicit A(int i = 0) : id(i) {} 31 32 }; 33 34 template <class T> 35 struct B 36 { 37 typedef T value_type; 38 39 int id; 40 explicit B(int i = 0) : id(i) {} 41 42 B select_on_container_copy_construction() const 43 { 44 return B(100); 45 } 46 }; 47 48 int main() 49 { 50 { 51 A<int> a; 52 assert(std::allocator_traits<A<int> >::select_on_container_copy_construction(a).id == 0); 53 } 54 { 55 const A<int> a(0); 56 assert(std::allocator_traits<A<int> >::select_on_container_copy_construction(a).id == 0); 57 } 58 #ifndef _LIBCPP_HAS_NO_ADVANCED_SFINAE 59 { 60 B<int> b; 61 assert(std::allocator_traits<B<int> >::select_on_container_copy_construction(b).id == 100); 62 } 63 { 64 const B<int> b(0); 65 assert(std::allocator_traits<B<int> >::select_on_container_copy_construction(b).id == 100); 66 } 67 #endif // _LIBCPP_HAS_NO_ADVANCED_SFINAE 68 } 69
