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std::rotate

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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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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 >

void rotate( ForwardIt first, ForwardIt n_first, ForwardIt last );
template< class ForwardIt >

ForwardIt rotate( ForwardIt first, ForwardIt n_first, ForwardIt last );
(bis C + +11)

(seit C++11)
Tauscht die Elemente im Bereich [first, last) derart, dass das Element das erste Element n_first des neuen Bereichs gerät und n_first - 1 wird das letzte Element .
Original:
Swaps the elements in the range [first, last) in such a way, that the element n_first becomes the first element of the new range and n_first - 1 becomes the last element.
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Inhaltsverzeichnis

[Bearbeiten] Parameter

first, last -
der Bereich der Elemente zu drehen
Original:
the range of elements to rotate
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n_first -
das Element, um zum Beginn des neuen Bereichs zu bewegen
Original:
the element to move to the beginning of the new range
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Type requirements
-
ForwardIt must meet the requirements of ValueSwappable and ForwardIterator.
-
The type of dereferenced ForwardIt must meet the requirements of MoveAssignable and MoveConstructible.

[Bearbeiten] Rückgabewert

(None) (bis C + +11)
Original:
(none) (bis C + +11)
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Der Iterator gleich first + (last - n_first) (seit C++11)
Original:
The iterator equal to first + (last - n_first) (seit C++11)
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[Bearbeiten] Komplexität

linear im Abstand first und last
Original:
linear in the distance between first and last
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[Bearbeiten] Mögliche Implementierung

template<class ForwardIt>
void rotate(ForwardIt first, ForwardIt n_first, ForwardIt last)
{
    ForwardIt next = n_first;
    while (first != next) {
        std::swap(*first++, *next++);
        if (next == last) {
            next = n_first;
        } else if (first == n_first) {
            n_first = next;
        }
    }
}

[Bearbeiten] Beispiel

std :: rotate ist eine gemeinsame Baustein in vielen Algorithmen. Dieses Beispiel zeigt, Insertion Sort in C + +
Original:
std::rotate is a common building block in many algorithms. This example demonstrates insertion sort in C++
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#include <vector>
#include <iostream>
#include <algorithm>
 
int main()
{
    std::vector<int> v{2, 4, 2, 0, 5, 10, 7, 3, 7, 1}; 
 
    std::cout << "before sort:      ";
    for(int n: v)
        std::cout << n << ' ';
    std::cout << '\n';
 
    // insertion sort
    for (auto i = v.begin(); i != v.end(); ++i) {
        std::rotate(std::upper_bound(v.begin(), i, *i), i, i+1);
    }
 
    std::cout << "after sort:       ";
    for(int n: v)
        std::cout << n << ' ';
    std::cout << '\n';
 
    // simple rotation to the left
    std::rotate(v.begin(), v.begin() + 1, v.end());
 
    std::cout << "simple rotate left  : ";
    for(int n: v)
        std::cout << n << ' ';
    std::cout << '\n';
 
    // simple rotation to the right
    std::rotate(v.rbegin(), v.rbegin() + 1, v.rend());
 
    std::cout << "simple rotate right : ";
    for(int n: v)
        std::cout << n << ' ';
    std::cout << '\n';
 
}

Output:

before sort:      2 4 2 0 5 10 7 3 7 1 
after sort:       0 1 2 2 3 4 5 7 7 10 
simple rotate left : 1 2 2 3 4 5 7 7 10 0
simple rotate right: 0 1 2 2 3 4 5 7 7 10

[Bearbeiten] Siehe auch

Kopien und drehen eine Reihe von Elementen
Original:
copies and rotate a range of elements
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(Funktions-Template) [edit]