std::reverse_iterator - cppreference.com

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Definido no cabeçalho `<iterator>`

`template< class Iterator > class reverse_iterator : public std::iterator< typename std::iterator_traits<Iterator>::iterator_category, typename std::iterator_traits<Iterator>::value_type, typename std::iterator_traits<Iterator>::difference_type, typename std::iterator_traits<Iterator>::pointer, typename std::iterator_traits<Iterator>::reference >`

std::reverse_iterator é um adaptador iterador que inverte a direção de um iterador determinado. Em outras palavras, quando fornecido com um iterador bidirecional, std::reverse_iterator produz um novo iterador que se move a partir do fim para o princípio da sequência definida pela iterador subjacente bidireccional.

Original:

std::reverse_iterator is an iterator adaptor that reverses the direction of a given iterator. In other words, when provided with a bidirectional iterator, std::reverse_iterator produces a new iterator that moves from the end to the beginning of the sequence defined by the underlying bidirectional iterator.

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Para uma r iterador reverso construído a partir de uma i iterador, o &*r == &*(i-1) relação é sempre verdadeiro, assim um iterador inverso construído a partir de um dereferences iterador um-passado-finais a para o último elemento de uma sequência.

Original:

For a reverse iterator r constructed from an iterator i, the relationship &*r == &*(i-1) is always true; thus a reverse iterator constructed from a one-past-the-end iterator dereferences to the last element in a sequence.

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Este é o iterador retornado por funções de membro rbegin() e rend() dos contêineres da biblioteca padrão.

Original:

This is the iterator returned by member functions rbegin() and rend() of the standard library containers.

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Tipos de membro


Tipo de membro Original: Member type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.	Definition

`iterator_type`	`Iterator`

`difference_type`	`std::iterator_traits<Iterator>::difference_type`

`pointer`	`std::iterator_traits<Iterator>::pointer`

`reference`	`std::iterator_traits<Iterator>::reference`

Funções de membro


(constructor)	constrói um novo adaptador de iterador Original: constructs a new iterator adaptor The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (função pública membro) [edit]

operator=	atribui outro iterador Original: assigns another iterator The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (função pública membro) [edit]

base	acessa o iterador subjacente Original: accesses the underlying iterator The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (função pública membro) [edit]

operator* operator->	acessa o elemento apontou-a Original: accesses the pointed-to element The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (função pública membro) [edit]

operator[]	obtém rvalue referência ao elemento indexado Original: obtains rvalue reference to indexed element The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (função pública membro) [edit]

operator++ operator++(int) operator+= operator+ operator-- operator--(int) operator-= operator-	avanços ou diminui o iterador Original: advances or decrements the iterator The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (função pública membro) [edit]

Objetos Membros


Nome do membro Original: Member name The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.	Definition

`current` (protegido)	uma cópia do iterador base () Original: a copy of the base() iterator The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

Para além do valor corrente do iterador subjacente, uma implementação típica do std::reverse_iterator contém uma cópia decrementado do iterador subjacente, que é usado em dereferencing.

Original:

In addition to the current value of the underlying iterator, a typical implementation of std::reverse_iterator holds a decremented copy of the underlying iterator, which is used in dereferencing.

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Não-membros funções


operator== operator!= operator< operator<= operator> operator>=	compara os iteradores subjacentes Original: compares the underlying iterators The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (modelo de função) [edit]

operator+	avança o iterador Original: advances the iterator The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (modelo de função) [edit]

operator-	calcula a distância entre dois adaptadores iterador Original: computes the distance between two iterator adaptors The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (modelo de função) [edit]

Herdado de std::iterator

Member types


Tipo de membro Original: Member type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.	Definition

`value_type`	`std::iterator_traits<Iterator>::value_type`

`difference_type`	`std::iterator_traits<Iterator>::difference_type`

`pointer`	`std::iterator_traits<Iterator>::pointer`

`reference`	`std::iterator_traits<Iterator>::reference`

`iterator_category`	`std::iterator_traits<Iterator>::iterator_category`

Exemplo

#include <iostream>
#include <string>
#include <iterator>

int main()
{
    std::string s = "Hello, world";
    std::reverse_iterator<std::string::iterator> r = s.rbegin();
    r[7] = 'O'; // replaces 'o' with 'O' 
    r += 7; // iterator now points at 'O'
    std::string rev(r, s.rend());
    std::cout << rev << '\n';
}

Saída:

Veja também


	o iterador básica Original: the basic iterator The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (modelo de classe) [edit]