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std::reverse_iterator

Da cppreference.com.
< cpp‎ | iterator

 
 
Biblioteca Iterator
Primitive iteratori
Original:
Iterator primitives
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iterator_traits
input_iterator_tag
output_iterator_tag
forward_iterator_tag
bidirectional_iterator_tag
random_access_iterator_tag
iterator
Adattatori iteratori
Original:
Iterator adaptors
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reverse_iterator
Flusso iteratori
Original:
Stream iterators
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istream_iterator
ostream_iterator
istreambuf_iterator
ostreambuf_iterator
Operazioni di iteratori
Original:
Iterator operations
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advance
distance
prev(C++11)
next(C++11)
Intervallo accesso
Original:
Range access
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begin(C++11)
end(C++11)
 
std::reverse_iterator
Membri funzioni
Original:
Member functions
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reverse_iterator::reverse_iterator
reverse_iterator::operator=
reverse_iterator::base
reverse_iterator::operator*
reverse_iterator::operator->
reverse_iterator::operator[]
reverse_iterator::operator++
reverse_iterator::operator+
reverse_iterator::operator+=
reverse_iterator::operator--
reverse_iterator::operator-
reverse_iterator::operator-=
Non membri funzioni
Original:
Non-member functions
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operator==
operator!=
operator<
operator>
operator+
operator-
 
Defined in header <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 iteratore è un adattatore che inverte la direzione di un iteratore dato. In altre parole, quando viene fornito un iteratore bidirezionale, std::reverse_iterator produce un nuovo iteratore che muove dalla fine all'inizio della sequenza definita dalla sottostante iteratore bidirezionale.
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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Per un r iteratore inverso costruito da un i iteratore, il &*r == &*(i-1) relazione è sempre vero, quindi un iteratore inverso costruito da un dereferenziazioni iteratore di un past-the-end per l'ultimo elemento di una sequenza.
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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Questo è l'iteratore restituito da funzioni membro rbegin() e rend() dei contenitori della libreria standard.
Original:
This is the iterator returned by member functions rbegin() and rend() of the standard library containers.
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Indice

[modifica] Membri tipi

Membro tipo
Original:
Member type
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Definition
iterator_type Iterator
difference_type std::iterator_traits<Iterator>::difference_type
pointer std::iterator_traits<Iterator>::pointer
reference std::iterator_traits<Iterator>::reference

[modifica] Membri funzioni

costruisce un nuovo adattatore iteratore
Original:
constructs a new iterator adaptor
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(membro pubblico funzione) [edit]
assegna un altro iteratore
Original:
assigns another iterator
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(membro pubblico funzione) [edit]
accede l'iteratore sottostante
Original:
accesses the underlying iterator
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(membro pubblico funzione) [edit]
accede alla punta-all'elemento
Original:
accesses the pointed-to element
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(membro pubblico funzione) [edit]
ottiene rvalue riferimento all'elemento indicizzati
Original:
obtains rvalue reference to indexed element
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(membro pubblico funzione) [edit]
anticipi o decrementa l'iteratore
Original:
advances or decrements the iterator
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(membro pubblico funzione) [edit]

[modifica] Membri oggetti

Persona
Original:
Member name
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Definition
current (protetto)
una copia del iteratore base ()
Original:
a copy of the base() iterator
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Oltre al valore corrente del iteratore sottostante, una tipica implementazione di std::reverse_iterator contiene una copia decrementato dell'iteratore sottostante, che è usato in dereferenziazione.
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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[modifica] Non membri funzioni

confronta i iteratori sottostanti
Original:
compares the underlying iterators
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(funzione di modello) [edit]
avanza l'iteratore
Original:
advances the iterator
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(funzione di modello) [edit]
calcola la distanza tra due schede di iteratore
Original:
computes the distance between two iterator adaptors
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(funzione di modello) [edit]

Inherited from std::iterator

Member types

Membro tipo
Original:
Member type
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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

[modifica] Esempio

#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';
}

Output:

OlleH

[modifica] Vedi anche

l'iteratore di base
Original:
the basic iterator
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(classe template) [edit]