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 // template <class Ptr> 16 // static void destroy(allocator_type& a, Ptr p); 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 30 }; 31 32 int b_destroy = 0; 33 34 template <class T> 35 struct B 36 { 37 typedef T value_type; 38 39 template <class U> 40 void destroy(U* p) 41 { 42 ++b_destroy; 43 p->~U(); 44 } 45 }; 46 47 struct A0 48 { 49 static int count; 50 ~A0() {++count;} 51 }; 52 53 int A0::count = 0; 54 55 int main() 56 { 57 { 58 A0::count = 0; 59 A<int> a; 60 std::aligned_storage<sizeof(A0)>::type a0; 61 std::allocator_traits<A<int> >::construct(a, (A0*)&a0); 62 assert(A0::count == 0); 63 std::allocator_traits<A<int> >::destroy(a, (A0*)&a0); 64 assert(A0::count == 1); 65 } 66 #ifndef _LIBCPP_HAS_NO_ADVANCED_SFINAE 67 { 68 A0::count = 0; 69 b_destroy = 0; 70 B<int> b; 71 std::aligned_storage<sizeof(A0)>::type a0; 72 std::allocator_traits<B<int> >::construct(b, (A0*)&a0); 73 assert(A0::count == 0); 74 assert(b_destroy == 0); 75 std::allocator_traits<B<int> >::destroy(b, (A0*)&a0); 76 assert(A0::count == 1); 77 assert(b_destroy == 1); 78 } 79 #endif // _LIBCPP_HAS_NO_ADVANCED_SFINAE 80 } 81
