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