git / moonbite-core / src/util/ref.h · raw

// Copyright (c) 2020 The Bitcoin Core developers// Distributed under the MIT software license, see the accompanying// file COPYING or http://www.opensource.org/licenses/mit-license.php.#ifndef BITCOIN_UTIL_REF_H#define BITCOIN_UTIL_REF_H#include <util/check.h>#include <typeindex>namespace util {/** * Type-safe dynamic reference. * * This implements a small subset of the functionality in C++17's std::any * class, and can be dropped when the project updates to C++17 * (https://github.com/bitcoin/bitcoin/issues/16684) */class Ref{public:    Ref() = default;    template<typename T> Ref(T& value) { Set(value); }    template<typename T> T& Get() const { CHECK_NONFATAL(Has<T>()); return *static_cast<T*>(m_value); }    template<typename T> void Set(T& value) { m_value = &value; m_type = std::type_index(typeid(T)); }    template<typename T> bool Has() const { return m_value && m_type == std::type_index(typeid(T)); }    void Clear() { m_value = nullptr; m_type = std::type_index(typeid(void)); }private:    void* m_value = nullptr;    std::type_index m_type = std::type_index(typeid(void));};} // namespace util#endif // BITCOIN_UTIL_REF_H