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using hashes to perform comparisons between blackmisc value objects stored inside of QVariant

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refs #81
This commit is contained in:
Klaus Basan
2013-12-22 20:40:30 +00:00
committed by Mathew Sutcliffe
parent 67a5dbfe48
commit a280d239e6
22 changed files with 416 additions and 0 deletions
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30
src/blackmisc/pqphysicalquantity.cpp
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@@ -254,6 +254,36 @@ namespace BlackMisc
return this->valueRoundedWithUnit(this->getUnit(), -1, i18n);
}
/*
* Hash
*/
template <class MU, class PQ> uint CPhysicalQuantity<MU, PQ>::getValueHash() const
{
QList<uint> hashs;
hashs << this->m_unit.getValueHash();
hashs << qHash(static_cast<long>(this->m_value));
return BlackMisc::calculateHash(hashs, "PQ");
}
/*
* Compare
*/
template <class MU, class PQ> int CPhysicalQuantity<MU, PQ>::compare(const QVariant &qv) const
{
Q_ASSERT(qv.canConvert<PQ>());
Q_ASSERT(!qv.isNull() && qv.isValid());
return this->compare(qv.value<PQ>());
}
/*
* Compare
*/
template <class MU, class PQ> int CPhysicalQuantity<MU, PQ>::compare(const PQ &other) const
{
if (other == (*this)) return 0;
return ((*this) < other) ? -1 : 1;
}
// see here for the reason of thess forward instantiations
// http://www.parashift.com/c++-faq/separate-template-class-defn-from-decl.html
template class CPhysicalQuantity<CLengthUnit, CLength>;