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std::rotate

Da cppreference.com
< cpp‎ | algorithm

 
 
Biblioteca algoritmo
Funções
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Functions
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Não modificar operações de seqüência
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Non-modifying sequence operations
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Modificando operações de seqüência
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Modifying sequence operations
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Particionamento operações
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Partitioning operations
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Operações de classificação (em intervalos ordenados)
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Sorting operations (on sorted ranges)
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Binários operações de busca (em intervalos ordenados)
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Binary search operations (on sorted ranges)
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Definir operações (em intervalos ordenados)
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Set operations (on sorted ranges)
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Operações de pilha
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Heap operations
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Mínimo / máximo de operações
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Minimum/maximum operations
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Operações numéricas
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Numeric operations
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C biblioteca
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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 );
(até C + 11)

(a partir do C++ 11)
Troca os elementos da gama [first, last) de tal maneira, que o elemento n_first torna-se o primeiro elemento da nova gama e n_first - 1 torna-se o elemento anterior.
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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Índice

[editar] Parâmetros

first, last -
a gama de elementos de girar
Original:
the range of elements to rotate
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n_first -
o elemento para mover para o início do intervalo de novo
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.

[editar] Valor de retorno

(Nenhum) (até C + 11)
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(none) (até C + 11)
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O iterador igual a first + (last - n_first) (a partir do C++ 11)
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The iterator equal to first + (last - n_first) (a partir do C++ 11)
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[editar] Complexidade

linear, em que a distância entre first e last
Original:
linear in the distance between first and last
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[editar] Possível implementação

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;
        }
    }
}

[editar] Exemplo

std :: rotação é um bloco de construção comum em muitos algoritmos. Este exemplo demonstra o tipo de inserção de 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

[editar] Veja também

cópias e rodar uma série de elementos
Original:
copies and rotate a range of elements
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(modelo de função) [edit]