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 // typedef Alloc::size_type | size_t size_type; 16 // ... 17 // }; 18 19 #include <memory> 20 #include <type_traits> 21 22 #include "test_macros.h" 23 24 template <class T> 25 struct A 26 { 27 typedef T value_type; 28 typedef unsigned short size_type; 29 }; 30 31 template <class T> 32 struct B 33 { 34 typedef T value_type; 35 }; 36 37 template <class T> 38 struct C 39 { 40 typedef T value_type; 41 struct pointer {}; 42 struct const_pointer {}; 43 struct void_pointer {}; 44 struct const_void_pointer {}; 45 }; 46 47 template <class T> 48 struct D { 49 typedef T value_type; 50 typedef short difference_type; 51 private: 52 typedef void size_type; 53 }; 54 55 namespace std 56 { 57 58 template <> 59 struct pointer_traits<C<char>::pointer> 60 { 61 typedef signed char difference_type; 62 }; 63 64 } 65 66 int main() 67 { 68 static_assert((std::is_same<std::allocator_traits<A<char> >::size_type, unsigned short>::value), ""); 69 static_assert((std::is_same<std::allocator_traits<B<char> >::size_type, 70 std::make_unsigned<std::ptrdiff_t>::type>::value), ""); 71 static_assert((std::is_same<std::allocator_traits<C<char> >::size_type, 72 unsigned char>::value), ""); 73 #if TEST_STD_VER >= 11 74 static_assert((std::is_same<std::allocator_traits<D<char> >::size_type, unsigned short>::value), ""); 75 #endif 76 } 77
