1// Copyright 2023 The Pigweed Authors
2//
3// Licensed under the Apache License, Version 2.0 (the "License"); you may not
4// use this file except in compliance with the License. You may obtain a copy of
5// the License at
6//
7//     https://www.apache.org/licenses/LICENSE-2.0
8//
9// Unless required by applicable law or agreed to in writing, software
10// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
11// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
12// License for the specific language governing permissions and limitations under
13// the License.
14#pragma once
15
16#include "pw_polyfill/standard_library/namespace.h"
17
18_PW_POLYFILL_BEGIN_NAMESPACE_STD
19
20template <typename T>
21T* addressof(T& arg) noexcept {
22  return reinterpret_cast<T*>(
23      const_cast<char*>(reinterpret_cast<const volatile char*>(&arg)));
24}
25
26template <typename T>
27T* addressof(T&& arg) = delete;
28
29template <typename T>
30struct pointer_traits;
31
32template <typename T>
33struct pointer_traits<T*> {
34  using pointer = T*;
35  using element_type = T;
36  using difference_type = decltype((const char*)1 - (const char*)1);
37};
38
39_PW_POLYFILL_END_NAMESPACE_STD
40