| // Copyright 2021 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef BASE_CXX20_TO_ADDRESS_H_ |
| #define BASE_CXX20_TO_ADDRESS_H_ |
| |
| #include <type_traits> |
| |
| namespace gurl_base { |
| |
| // Simplified C++14 implementation of C++20's std::to_address. |
| // Note: This does not consider specializations of pointer_traits<>::to_address, |
| // since that member function may only be present in C++20 and later. |
| // |
| // Reference: https://wg21.link/pointer.conversion#lib:to_address |
| template <typename T> |
| constexpr T* to_address(T* p) noexcept { |
| static_assert(!std::is_function<T>::value, |
| "Error: T must not be a function type."); |
| return p; |
| } |
| |
| template <typename Ptr> |
| constexpr auto to_address(const Ptr& p) noexcept { |
| return to_address(p.operator->()); |
| } |
| |
| } // namespace base |
| |
| #endif // BASE_CXX20_TO_ADDRESS_H_ |
