reference_wrapper.hh

/*
 * This file is open source software, licensed to you under the terms
 * of the Apache License, Version 2.0 (the "License").  See the NOTICE file
 * distributed with this work for additional information regarding copyright
 * ownership.  You may not use this file except in compliance with the License.
 *
 * You may obtain a copy of the License at
 *
 *   http://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.
 */
/*
 * Copyright (C) 2017 ScyllaDB Ltd.
 */
 
#pragma once
 
namespace seastar {
 
 
template<typename T>
class reference_wrapper {
    T* _pointer;
 
    explicit reference_wrapper(T& object) noexcept : _pointer(&object) { }
 
    template<typename U>
    friend reference_wrapper<U> ref(U&) noexcept;
    template<typename U>
    friend reference_wrapper<const U> cref(const U&) noexcept;
public:
    using type = T;
 
    operator T&() const noexcept { return *_pointer; }
    T& get() const noexcept { return *_pointer; }
 
};
 
template<typename T>
inline reference_wrapper<T> ref(T& object) noexcept {
    return reference_wrapper<T>(object);
}
 
template<typename T>
inline reference_wrapper<const T> cref(const T& object) noexcept {
    return reference_wrapper<const T>(object);
}
 
 
}