EmpiricalFormula EmpiricalFormula::operator+(const String & formula) const
{
EmpiricalFormula ef;
SignedSize charge = parseFormula_(ef.formula_, formula);
Map<const Element *, SignedSize>::ConstIterator it = formula_.begin();
for (; it != formula_.end(); ++it)
{
if (ef.formula_.has(it->first))
{
ef.formula_[it->first] += it->second;
}
else
{
ef.formula_[it->first] = it->second;
}
}
ef.charge_ = charge_ + charge;
ef.removeZeroedElements_();
return ef;
}
