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				// Copyright (c) 2017 - The Bitcoin Developers
				// Distributed under the MIT software license, see the accompanying
				// file COPYING or http://www.opensource.org/licenses/mit-license.php.

				#ifndef BITCOIN_SCRIPT_SCRIPTCACHE_H
				#define BITCOIN_SCRIPT_SCRIPTCACHE_H

				#include "uint256.h"

				#include <cstdint>

				class CTransaction;

				// DoS prevention: limit cache size to 32MB (over 1000000 entries on 64-bit
				// systems). Due to how we count cache size, actual memory usage is slightly
				// more (~32.25 MB)
				static const unsigned int DEFAULT_MAX_SCRIPT_CACHE_SIZE = 32;
				// Maximum sig cache size allowed
				static const int64_t MAX_MAX_SCRIPT_CACHE_SIZE = 16384;

				/** Initializes the script-execution cache */
				void InitScriptExecutionCache();

				/** Compute the cache key for a given transaction and flags. */
				uint256 GetScriptCacheKey(const CTransaction &tx, uint32_t flags);

				/** Check if a given key is in the cache. */
				bool IsKeyInScriptCache(uint256 key, bool erase);

				/** Add an entry in the cache. */
				void AddKeyInScriptCache(uint256 key);

				#endif // BITCOIN_SCRIPT_SCRIPTCACHE_H