Namespace
Varianti

std::rotate

Da cppreference.com.
< cpp‎ | algorithm

 
 
Algoritmo libreria
Funzioni
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Functions
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Non modifica le operazioni di sequenza
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Non-modifying sequence operations
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Modifica delle operazioni di sequenza
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Modifying sequence operations
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Partizionamento operazioni
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Partitioning operations
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Ordinamento delle operazioni (su intervalli ordinati)
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Sorting operations (on sorted ranges)
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Binarie (le operazioni di ricerca sui campi ordinati)
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Binary search operations (on sorted ranges)
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Impostare le operazioni (su intervalli ordinati)
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Set operations (on sorted ranges)
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Heap operazioni
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Heap operations
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Minimo / massimo le operazioni
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Minimum/maximum operations
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Operazioni numeriche
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Numeric operations
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Libreria C
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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 );
(C fino + 11)

(dal C++11)
Swap gli elementi nel [first, last) gamma in modo tale, che il n_first elemento diventa il primo elemento della nuova gamma e n_first - 1 diventa l'ultimo elemento.
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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Indice

[modifica] Parametri

first, last -
l'intervallo di elementi da ruotare
Original:
the range of elements to rotate
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n_first -
l'elemento di spostare l'inizio della nuova gamma
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.

[modifica] Valore di ritorno

(Nessuno) (C fino + 11)
Original:
(none) (C fino + 11)
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L'iteratore pari a first + (last - n_first) (dal C++11)
Original:
The iterator equal to first + (last - n_first) (dal C++11)
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[modifica] Complessità

lineare la distanza tra first e last
Original:
linear in the distance between first and last
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[modifica] Possibile implementazione

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;
        }
    }
}

[modifica] Esempio

std :: rotate è un elemento comune in molti algoritmi. Questo esempio dimostra 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

[modifica] Vedi anche

copie e ruotare una serie di elementi
Original:
copies and rotate a range of elements
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(funzione di modello) [edit]