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std::partition_point

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Algorithm Bibliothek
Funktionen
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Functions
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Nicht-modifizierende Sequenz Operationen
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Non-modifying sequence operations
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Modifizierende Sequenz Operationen
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Modifying sequence operations
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Partitionierungsoperationen
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Partitioning operations
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stable_partition
partition_point(C++11)
Sortierung Operationen (auf sortierten Bereiche)
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Sorting operations (on sorted ranges)
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Binary Suchaktionen (auf sortierten Bereiche)
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Binary search operations (on sorted ranges)
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Set-Operationen (auf sortierten Bereiche)
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Set operations (on sorted ranges)
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Heap-Operationen
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Heap operations
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Minimum / Maximum Operationen
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Minimum/maximum operations
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Numerische Operationen
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Numeric operations
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C-Bibliothek
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C library
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Defined in header <algorithm>
template< class ForwardIt, class UnaryPredicate >
ForwardIt partition_point( ForwardIt first, ForwardIt last, UnaryPredicate p);
(1) (seit C++11)
Untersucht die partitioniert (wie von std::partition) Bereich [first, last) und findet das Ende der ersten Partition, das ist das erste Element, das nicht erfüllt p oder last wenn die letzte, wenn alle Elemente zu befriedigen p .
Original:
Examines the partitioned (as if by std::partition) range [first, last) and locates the end of the first partition, that is, the first element that does not satisfy p or last if last if all elements satisfy p.
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Inhaltsverzeichnis

[Bearbeiten] Parameter

first, last -
die partitionierte Bereich von Elementen zu untersuchen
Original:
the partitioned range of elements to examine
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p - unary predicate which returns ​true
für die Elemente in den Anfang des Bereichs gefunden
Original:
for the elements found in the beginning of the range
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.

The signature of the predicate function should be equivalent to the following:

 bool pred(const Type &a);

The signature does not need to have const &, but the function must not modify the objects passed to it.
The type Type must be such that an object of type ForwardIt can be dereferenced and then implicitly converted to Type. ​

Type requirements
-
ForwardIt must meet the requirements of ForwardIterator.

[Bearbeiten] Rückgabewert

Der Iterator über das Ende der ersten Partition innerhalb [first, last) oder last wenn alle Elemente zu befriedigen p .
Original:
The iterator past the end of the first partition within [first, last) or last if all elements satisfy p.
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[Bearbeiten] Komplexität

Logarithmisch im Abstand zwischen first und last
Original:
Logarithmic in the distance between first and last
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[Bearbeiten] Beispiel

#include <algorithm>
#include <array>
#include <iostream>
#include <iterator>
 
int main()
{
    std::array<int, 9> v = { 1, 2, 3, 4, 5, 6, 7, 8, 9 };
 
    auto is_even = [](int i){ return i % 2 == 0; };
    std::partition(v.begin(), v.end(), is_even);
 
    auto p = std::partition_point(v.begin(), v.end(), is_even);
 
    std::cout << "Before partition:\n    ";
    std::copy(v.begin(), p, std::ostream_iterator<int>(std::cout, " "));
    std::cout << "\nAfter partition:\n    ";
    std::copy(p, v.end(), std::ostream_iterator<int>(std::cout, " "));
}

Output:

Before partition:
    8 2 6 4 
After partition:
    5 3 7 1 9

[Bearbeiten] Siehe auch

(C++11)
prüft, ob ein Bereich ist in aufsteigender Reihenfolge sortiert
Original:
checks whether a range is sorted into ascending order
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(Funktions-Template) [edit]