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refs #297 CDictionary: allow access to m_impl and added forEachIntersection function (only supported when impl is QMap).

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This commit is contained in:
Mathew Sutcliffe
2015-06-16 20:01:07 +01:00
parent 71d93f1690
commit 5da4b75d3e
1 changed files with 32 additions and 1 deletions
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33
src/blackmisc/dictionary.h
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@@ -368,6 +368,12 @@ namespace BlackMisc
//! Move assignment
CDictionary &operator =(CDictionary && other) { m_impl = std::move(other.m_impl); return *this; }
//! Return reference to the internal implementation object.
friend impl_type &implementationOf(CDictionary &dict) { return dict.m_impl; }
//! Return reference to the internal implementation object.
friend const impl_type &implementationOf(const CDictionary &dict) { return dict.m_impl; }
/*!
* \brief Access an element by its key.
* \note
@@ -419,10 +425,35 @@ namespace BlackMisc
}
private:
Impl<Key,Value> m_impl;
};
//! Identity function for API consistency with CDictionary::implementationOf.
template <class Key, class Value>
QMap<Key, Value> &implementationOf(QMap<Key, Value> &dict) { return dict; }
//! Identity function for API consistency with CDictionary::implementationOf.
template <class Key, class Value>
const QMap<Key, Value> &implementationOf(const QMap<Key, Value> &dict) { return dict; }
//! Call a functor for each {key,value1,value2} triple in the keywise intersection of two maps.
template <class Map1, class Map2, class F>
void forEachIntersection(const Map1 &map1, const Map2 &map2, F functor)
{
static_assert(std::is_same<typename Map1::key_type, typename Map2::key_type>::value, "Maps must have the same key type");
if (map1.empty() || map2.empty()) { return; }
auto it1 = implementationOf(map1).lowerBound(map2.cbegin().key());
auto end1 = implementationOf(map1).upperBound((map2.cend() - 1).key());
auto it2 = implementationOf(map2).lowerBound(map1.cbegin().key());
auto end2 = implementationOf(map2).upperBound((map1.cend() - 1).key());
while (it1 != end1 && it2 != end2)
{
if (it1.key() < it2.key()) { ++it1; }
else if (it2.key() < it1.key()) { ++it2; }
else { functor(it1.key(), it1.value(), it2.value()); ++it1; ++it2; }
}
}
} // namespace BlackMisc
#endif // BLACKMISC_DICTIONARY_H