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std::inplace_merge

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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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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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merge
inplace_merge
includes
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 BidirIt >
void inplace_merge( BidirIt first, BidirIt middle, BidirIt last );
(1)
template< class BidirIt, class Compare>
void inplace_merge( BidirIt first, BidirIt middle, BidirIt last, Compare comp );
(2)
Führt zwei aufeinanderfolgenden sortiert reicht [first, middle) und [middle, last) in einem sortierten Bereich [first, last). Die Reihenfolge der gleiche Elemente garantiert erhalten. Die erste Version verwendet operator< um die Elemente zu vergleichen, verwendet die zweite Version des gegebenen Vergleichsfunktion comp .
Original:
Merges two consecutive sorted ranges [first, middle) and [middle, last) into one sorted range [first, last). The order of equal elements is guaranteed to be preserved. The first version uses operator< to compare the elements, the second version uses the given comparison function comp.
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Inhaltsverzeichnis

[Bearbeiten] Parameter

first -
der Beginn der ersten sortierten Bereich
Original:
the beginning of the first sorted range
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middle -
das Ende der ersten sortierten Bereichs und dem Beginn des zweiten
Original:
the end of the first sorted range and the beginning of the second
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last -
das Ende des zweiten Bereichs sortiert
Original:
the end of the second sorted range
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comp - comparison function which returns ​true if the first argument is less than the second.

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

 bool cmp(const Type1 &a, const Type2 &b);

The signature does not need to have const &, but the function must not modify the objects passed to it.
The types Type1 and Type2 must be such that an object of type BidirIt can be dereferenced and then implicitly converted to both of them. ​

Type requirements
-
BidirIt must meet the requirements of ValueSwappable and BidirectionalIterator.
-
The type of dereferenced BidirIt must meet the requirements of MoveAssignable and MoveConstructible.

[Bearbeiten] Rückgabewert

(None)
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(none)
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[Bearbeiten] Komplexität

Genau N-1 Vergleiche, wenn genügend zusätzliche Speicher verfügbar ist, sonst N·log(N) wo N = std::distance(first, last) .
Original:
Exactly N-1 comparisons if enough additional memory is available, otherwise N·log(N) where N = std::distance(first, last).
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[Bearbeiten] Notes

Diese Funktion versucht, einen temporären Puffer zuzuordnen, in der Regel durch den Aufruf std::get_temporary_buffer. Wenn die Zuweisung fehlschlägt, wird die weniger effizienten Algorithmus gewählt .
Original:
This function attempts to allocate a temporary buffer, typically by calling std::get_temporary_buffer. If the allocation fails, the less efficient algorithm is chosen.
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[Bearbeiten] Beispiel

Der folgende Code ist eine Implementierung von Mergesort .
Original:
The following code is an implementation of merge sort.
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#include <vector>
#include <iostream>
#include <algorithm>
 
template<class Iter>
void merge_sort(Iter first, Iter last)
{
    if (last - first > 1) {
        Iter middle = first + (last - first) / 2;
        merge_sort(first, middle);
        merge_sort(middle, last);
        std::inplace_merge(first, middle, last);
    }
}
 
int main()
{
    std::vector<int> v{8, 2, -2, 0, 11, 11, 1, 7, 3};
    merge_sort(v.begin(), v.end());
    for(auto n : v) {
        std::cout << n << ' ';
    }
    std::cout << '\n';
}

Output:

-2 0 1 2 3 7 8 11 11

[Bearbeiten] Siehe auch

führt zwei sortierte reicht
Original:
merges two sorted ranges
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(Funktions-Template) [edit]
Sortiert einen Bereich in aufsteigender Reihenfolge
Original:
sorts a range into ascending order
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(Funktions-Template) [edit]
Arten eine Reihe von Elementen, während Aufrechterhaltung der Ordnung zwischen gleichen Elementen
Original:
sorts a range of elements while preserving order between equal elements
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(Funktions-Template) [edit]