pw_minimal_cpp_stdlib/public/pw_minimal_cpp_stdlib/internal/functional.h

// Copyright 2023 The Pigweed Authors
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy of
// the License at
//
//     https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
#pragma once

#include "pw_polyfill/standard_library/namespace.h"

_PW_POLYFILL_BEGIN_NAMESPACE_STD

template <typename T>
class reference_wrapper {
 public:
  using type = T;

  // This constructor is incomplete / incorrect!
  constexpr reference_wrapper(T& reference) : pointer_(&reference) {}

  constexpr reference_wrapper(const reference_wrapper&) noexcept = default;
  constexpr reference_wrapper& operator=(const reference_wrapper&) noexcept =
      default;

  constexpr T& get() const noexcept { return *pointer_; }
  constexpr operator T&() const noexcept { return *pointer_; }

 private:
  T* pointer_;
};

_PW_POLYFILL_END_NAMESPACE_STD