Differential D8494 Diff 25975 src/wallet/coinselection.cpp

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src/wallet/coinselection.cpp

	// Copyright (c) 2017 The Bitcoin Core developers			// Copyright (c) 2017 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 <wallet/coinselection.h>			#include <wallet/coinselection.h>

	#include <optional.h>
	#include <util/moneystr.h>			#include <util/moneystr.h>
	#include <util/system.h>			#include <util/system.h>

	// Descending order comparator			// Descending order comparator
	struct {			struct {
	bool operator()(const OutputGroup &a, const OutputGroup &b) const {			bool operator()(const OutputGroup &a, const OutputGroup &b) const {
	return a.effective_value > b.effective_value;			return a.effective_value > b.effective_value;
	}			}
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	}			}

	bool KnapsackSolver(const Amount nTargetValue, std::vector<OutputGroup> &groups,			bool KnapsackSolver(const Amount nTargetValue, std::vector<OutputGroup> &groups,
	std::set<CInputCoin> &setCoinsRet, Amount &nValueRet) {			std::set<CInputCoin> &setCoinsRet, Amount &nValueRet) {
	setCoinsRet.clear();			setCoinsRet.clear();
	nValueRet = Amount::zero();			nValueRet = Amount::zero();

	// List of values less than target			// List of values less than target
	Optional<OutputGroup> lowest_larger;			std::optional<OutputGroup> lowest_larger;
	std::vector<OutputGroup> applicable_groups;			std::vector<OutputGroup> applicable_groups;
	Amount nTotalLower = Amount::zero();			Amount nTotalLower = Amount::zero();

	Shuffle(groups.begin(), groups.end(), FastRandomContext());			Shuffle(groups.begin(), groups.end(), FastRandomContext());

	for (const OutputGroup &group : groups) {			for (const OutputGroup &group : groups) {
	if (group.m_value == nTargetValue) {			if (group.m_value == nTargetValue) {
	util::insert(setCoinsRet, group.m_outputs);			util::insert(setCoinsRet, group.m_outputs);
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