Namespace
Varianti

std::input_iterator_tag, std::output_iterator_tag, std::forward_iterator_tag, std::bidirectional_iterator_tag, std::random_access_iterator_tag

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)
 
Defined in header <iterator>
struct input_iterator_tag { };
struct output_iterator_tag { };
struct forward_iterator_tag : public input_iterator_tag { };
struct bidirectional_iterator_tag : public forward_iterator_tag { };
struct random_access_iterator_tag : public bidirectional_iterator_tag { };
I tipi di vuoti std::input_iterator_tag, std::output_iterator_tag, forward_iterator_tag, bidirectional_iterator_tag e random_access_iterator_tag sono usati per selezionare algoritmi appropriati in base alla categoria di un iteratore. Per ogni tipo di iteratore, un std::iterator_traits<Iterator>::iterator_category typedef è disponibile, che è un alias di uno di questi tipi di tag cinque.
Original:
The empty types std::input_iterator_tag, std::output_iterator_tag, forward_iterator_tag, bidirectional_iterator_tag, and random_access_iterator_tag are used to select appropriate algorithms based on the category of an iterator. For every iterator type, a typedef std::iterator_traits<Iterator>::iterator_category is available, which is an alias to one of these five tag types.
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[modifica] Esempio

Tecnica comune per la selezione algoritmo basato su tag iteratore categoria è quello di utilizzare una funzione dispatcher (l'alternativa è std :: enable_if)
Original:
Common technique for algorithm selection based on iterator category tags is to use a dispatcher function (the alternative is std::enable_if)
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#include <iostream>
#include <vector>
#include <list>
#include <iterator>
 
template< class BDIter >
void alg(BDIter, BDIter, std::bidirectional_iterator_tag)
{
    std::cout << "alg() called for bidirectional iterator\n";
}
 
template <class RAIter>
void alg(RAIter, RAIter, std::random_access_iterator_tag)
{
    std::cout << "alg() called for random-access iterator\n";
}
 
template< class Iter >
void alg(Iter first, Iter last)
{
    alg(first, last,
        typename std::iterator_traits<Iter>::iterator_category());
}
 
int main()
{
    std::vector<int> v;
    alg(v.begin(), v.end());
 
    std::list<int> l;
    alg(l.begin(), l.end());
 
//    std::istreambuf_iterator<char> i1(std::cin), i2;
//    alg(i1, i2); // compile error: no matching function for call
}

Output:

alg() called for random-access iterator
alg() called for bidirectional iterator

[modifica] Vedi anche

l'iteratore di base
Original:
the basic iterator
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(classe template) [edit]
fornisce un'interfaccia uniforme per le proprietà di un iteratore
Original:
provides uniform interface to the properties of an iterator
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(classe template) [edit]