//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// <memory>
// template <class Alloc>
// struct allocator_traits
// {
// typedef Alloc::difference_type
// | pointer_traits<pointer>::difference_type difference_type;
// ...
// };
#include <memory>
#include <cstddef>
#include <type_traits>
#include "test_macros.h"
template <class T>
struct A
{
typedef T value_type;
typedef short difference_type;
};
template <class T>
struct B
{
typedef T value_type;
};
template <class T>
struct C
{
typedef T value_type;
struct pointer {};
struct const_pointer {};
struct void_pointer {};
struct const_void_pointer {};
};
template <class T>
struct D
{
typedef T value_type;
private:
typedef void difference_type;
};
template <>
struct std::pointer_traits<C<char>::pointer> {
typedef C<char>::pointer pointer;
typedef char element_type;
typedef signed char difference_type;
};
int main(int, char**)
{
static_assert((std::is_same<std::allocator_traits<A<char> >::difference_type, short>::value), "");
static_assert((std::is_same<std::allocator_traits<B<char> >::difference_type, std::ptrdiff_t>::value), "");
static_assert((std::is_same<std::allocator_traits<C<char> >::difference_type, signed char>::value), "");
#if TEST_STD_VER >= 11
static_assert((std::is_same<std::allocator_traits<D<char> >::difference_type, std::ptrdiff_t>::value), "");
#endif
return 0;
}