chain.h
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chain.h
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	// Copyright (c) 2022 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_KERNEL_CHAIN_H
	#define BITCOIN_KERNEL_CHAIN_H

	#include <iostream>

	//! This enum describes the various roles a specific Chainstate instance can
	//! take. Other parts of the system sometimes need to vary in behavior depending
	//! on the existence of a background validation chainstate, e.g. when building
	//! indexes.
	enum class ChainstateRole {
	// Single chainstate in use, "normal" IBD mode.
	NORMAL,

	// Doing IBD-style validation in the background. Implies use of an
	// assumed-valid
	// chainstate.
	BACKGROUND,

	// Active assumed-valid chainstate. Implies use of a background IBD
	// chainstate.
	ASSUMEDVALID,
	};

	std::ostream &operator<<(std::ostream &os, const ChainstateRole &role);

	#endif // BITCOIN_KERNEL_CHAIN_H