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	// Copyright (c) 2018 The Bitcoin Core developers			// Copyright (c) 2018 The Bitcoin Core developers
	// Distributed under the MIT software license, see the accompanying			// Distributed under the MIT software license, see the accompanying
	// file COPYING or http://www.opensource.org/licenses/mit-license.php.			// file COPYING or http://www.opensource.org/licenses/mit-license.php.

	#include <interfaces/chain.h>			#include <interfaces/chain.h>

				#include <sync.h>
	#include <util/system.h>			#include <util/system.h>
				#include <validation.h>

				#include <memory>
				#include <utility>

	namespace interfaces {			namespace interfaces {
	namespace {			namespace {

	class ChainImpl : public Chain {};			class LockImpl : public Chain::Lock {};

				class LockingStateImpl : public LockImpl,
				public UniqueLock<CCriticalSection> {
				using UniqueLock::UniqueLock;
				};

				class ChainImpl : public Chain {
				public:
				std::unique_ptr<Chain::Lock> lock(bool try_lock) override {
				auto result = std::make_unique<LockingStateImpl>(
				::cs_main, "cs_main", __FILE__, __LINE__, try_lock);
				if (try_lock && result && !*result) {
				return {};
				}
				// std::move necessary on some compilers due to conversion from
				// LockingStateImpl to Lock pointer
				return std::move(result);
				}
				std::unique_ptr<Chain::Lock> assumeLocked() override {
				return std::make_unique<LockImpl>();
				}
				};

	} // namespace			} // namespace

	std::unique_ptr<Chain> MakeChain() {			std::unique_ptr<Chain> MakeChain() {
	return std::make_unique<ChainImpl>();			return std::make_unique<ChainImpl>();
	}			}

	} // namespace interfaces			} // namespace interfaces