| //===----------------------------------------------------------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is dual licensed under the MIT and the University of Illinois Open |
| // Source Licenses. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // <memory> |
| |
| // template <class Alloc> |
| // struct allocator_traits |
| // { |
| // static allocator_type |
| // select_on_container_copy_construction(const allocator_type& a); |
| // ... |
| // }; |
| |
| #include <memory> |
| #include <new> |
| #include <type_traits> |
| #include <cassert> |
| |
| template <class T> |
| struct A |
| { |
| typedef T value_type; |
| int id; |
| explicit A(int i = 0) : id(i) {} |
| |
| }; |
| |
| template <class T> |
| struct B |
| { |
| typedef T value_type; |
| |
| int id; |
| explicit B(int i = 0) : id(i) {} |
| |
| B select_on_container_copy_construction() const |
| { |
| return B(100); |
| } |
| }; |
| |
| int main() |
| { |
| { |
| A<int> a; |
| assert(std::allocator_traits<A<int> >::select_on_container_copy_construction(a).id == 0); |
| } |
| { |
| const A<int> a(0); |
| assert(std::allocator_traits<A<int> >::select_on_container_copy_construction(a).id == 0); |
| } |
| #ifndef _LIBCPP_HAS_NO_ADVANCED_SFINAE |
| { |
| B<int> b; |
| assert(std::allocator_traits<B<int> >::select_on_container_copy_construction(b).id == 100); |
| } |
| { |
| const B<int> b(0); |
| assert(std::allocator_traits<B<int> >::select_on_container_copy_construction(b).id == 100); |
| } |
| #endif // _LIBCPP_HAS_NO_ADVANCED_SFINAE |
| } |