std::iterator_traits

 

C++

Linguaggio

Concetti

Libreria di Utilità

Stringhe

Contenitori

Algoritmi

Iteratori

Libreria matematca

Input/output

Localizzazione

Espressioni regolari(C++11)

Operazioni atomicche(C++11)

Multithreading(C++11)

 

Biblioteca Iterator

Primitive iteratori Original: Iterator primitives The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
iterator_traits
input_iterator_tag output_iterator_tag forward_iterator_tag bidirectional_iterator_tag random_access_iterator_tag
iterator
Adattatori iteratori Original: Iterator adaptors The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
reverse_iterator
move_iterator (C++11) back_insert_iterator front_insert_iterator insert_iterator	make_move_iterator (C++11) back_inserter front_inserter inserter
Flusso iteratori Original: Stream iterators The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
istream_iterator
ostream_iterator
istreambuf_iterator
ostreambuf_iterator
Operazioni di iteratori Original: Iterator operations The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
advance
distance
prev (C++11)
next (C++11)
Intervallo accesso Original: Range access The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
begin (C++11)
end (C++11)

 

Elemento definito nell'header <iterator>
template<class Iterator> struct iterator_traits;
template<class T > struct iterator_traits<T*>;
template<class T > struct iterator_traits<const T*>;

std::iterator_traits è la classe tratto tipo che fornisce un'interfaccia uniforme per le proprietà dei tipi iteratore. Ciò rende possibile implementare algoritmi solo in termini di iteratori.

Original:

std::iterator_traits is the type trait class that provides uniform interface to the properties of iterator types. This makes it possible to implement algorithms only in terms of iterators.

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Membri tipi

Membro tipo 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
difference_type	Iterator::difference_type
value_type	Iterator::value_type
pointer	Iterator::pointer
reference	Iterator::reference
iterator_category	Iterator::iterator_category

Specializzazioni

Questa caratteristica può essere di tipo specializzato per fornito dall'utente tipi che possono essere utilizzati come iteratori. La libreria standard fornisce due specializzazioni parziali per i tipi di puntatore * T, che permette di utilizzare tutte iteratore con algoritmi basati su puntatori prime.

Original:

This type trait may be specialized for user-provided types that may be used as iterators. The standard library provides two partial specializations for pointer types T*, which makes it possible to use all iterator-based algorithms with raw pointers.

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T * specializzazione utente tipi

Membro tipo 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
difference_type	std::ptrdiff_t
value_type	T
pointer	T*
reference	T&
iterator_category	std::random_access_iterator_tag

const T * tipi di membro di specializzazione

Membro tipo 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
difference_type	std::ptrdiff_t
value_type	T
pointer	const T*
reference	const T&
iterator_category	std::random_access_iterator_tag

Esempio

general-purpose reverse () implementazione per iteratori bidirezionali

Original:

general-purpose reverse() implementation for bidirectional iterators

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#include <iostream>#include <iterator>#include <vector>#include <list>   template<class BDIter>void my_reverse(BDIter first, BDIter last){typename std::iterator_traits<BDIter>::difference_type n =std::distance(first, last);--n;while(n >0){typename std::iterator_traits<BDIter>::value_type tmp =*first;*first++=*--last;*last = tmp; n -=2;}}   int main(){std::vector<int> v{1,2,3,4,5}; my_reverse(v.begin(), v.end());for(int n : v)std::cout<< n <<' ';std::cout<<'\n';   std::list<int> l{1,2,3,4,5}; my_reverse(l.begin(), l.end());for(auto n : l)std::cout<< n <<' ';std::cout<<'\n';   // std::istreambuf_iterator<char> i1(std::cin), i2;// my_reverse(i1, i2); // compilation error   }

Output:

5 4 3 2 1 5 4 3 2 1

Vedi anche

iterator	l'iteratore di base 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. (classe template)
input_iterator_tag output_iterator_tag forward_iterator_tag bidirectional_iterator_tag random_access_iterator_tag	tipologie di classi vuote per indicare categorie di iteratori Original: empty class types used to indicate iterator categories The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (classe)