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//
// Copyright (C) 2020 Schrödinger, LLC
//
// @@ All Rights Reserved @@
// This file is part of the RDKit.
// The contents are covered by the terms of the BSD license
// which is included in the file license.txt, found at the root
// of the RDKit source tree.
//
#include "Rule1a.h"
#include "../Mancude.h"
namespace RDKit {
namespace CIPLabeler {
Rule1a::Rule1a() = default;
// CIP Rule 1a: Higher atomic number precedes lower.
int Rule1a::compare(const Edge *a, const Edge *b) const {
const auto afrac = a->getEnd()->getAtomicNumFraction();
const auto bfrac = b->getEnd()->getAtomicNumFraction();
if (afrac.numerator() == 0 || bfrac.numerator() == 0) {
return 0;
}
return three_way_comparison(afrac, bfrac);
}
} // namespace CIPLabeler
} // namespace RDKit
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