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refs #700 Added sortByProperty method for sequences.

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This commit is contained in:
Mathew Sutcliffe
2016-07-02 01:43:28 +01:00
parent bf61657376
commit b859bead0c
3 changed files with 84 additions and 0 deletions
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24
src/blackmisc/sequence.h
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@@ -14,6 +14,7 @@
#include "iterator.h"
#include "containerbase.h"
#include "propertyindex.h"
#include "icon.h"
#include <QScopedPointer>
#include <algorithm>
@@ -387,6 +388,21 @@ namespace BlackMisc
sort(BlackMisc::Predicates::MemberLess(key1, keys...));
}
//! In-place sort by some properties specified by a list of property indexes.
void sortByProperty(const CSequence<CPropertyIndex> &indexes)
{
sort([&indexes](const T &a, const T &b)
{
for (const auto &index : indexes)
{
int cmp = index.comparator()(a, b);
if (cmp < 0) { return true; }
if (cmp > 0) { return false; }
}
return false;
});
}
//! Return a copy sorted by a given comparator predicate.
template <class Predicate>
CSequence sorted(Predicate p) const
@@ -405,6 +421,14 @@ namespace BlackMisc
return sorted(BlackMisc::Predicates::MemberLess(key1, keys...));
}
//! Return a copy sorted by some properties specified by a list of property indexes.
CSequence sortedByProperty(const CSequence<CPropertyIndex> &indexes) const
{
CSequence result = *this;
result.sortByProperty(indexes);
return result;
}
//! In-place move the smallest n elements to the beginning and sort them.
template <class Predicate> void partiallySort(size_type n, Predicate p)
{