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//===----------------------------------------------------------------------===//
//
// 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
// {
// typedef Alloc::difference_type
// | pointer_traits<pointer>::difference_type difference_type;
// ...
// };
#include <memory>
#include <type_traits>
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 {};
};
namespace std
{
template <>
struct pointer_traits<C<char>::pointer>
{
typedef signed char difference_type;
};
}
int main()
{
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), "");
}
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