Namespace
Varianti

std::distance

Da cppreference.com.
< cpp‎ | iterator

Questa pagina è stata tradotta in modo automatico dalla versione in ineglese della wiki usando Google Translate.

La traduzione potrebbe contenere errori e termini strani. Muovi il puntatore sopra al testo per vedere la versione originale. Puoi aiutarci a correggere gli gli errori. Per ulteriori istruzioni clicca qui.

Click here for the English version of this page

 
C++
 
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
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 InputIt >

typename std::iterator_traits<InputIt>::difference_type

    distance( InputIt first, InputIt last );
Restituisce il numero di elementi tra first e last.
Original:
Returns the number of elements between first and last.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Il comportamento è indefinito se last non è raggiungibile da first da (eventualmente più volte) l'incremento first.
Original:
The behavior is undefined if last is not reachable from first by (possibly repeatedly) incrementing first.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

Indice

[modifica] Parametri

first -
iteratore che punta al primo elemento
Original:
iterator pointing to the first element
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
last -
iteratore che punta all'ultimo elemento
Original:
iterator pointing to the last element
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Type requirements
-
InputIt must meet the requirements of InputIterator. The operation is more efficient if InputIt additionally meets the requirements of RandomAccessIterator

[modifica] Valore di ritorno

Il numero di elementi tra first e last.
Original:
The number of elements between first and last.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

[modifica] Complessità

Lineare.
Original:
Linear.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Tuttavia, se InputIt soddisfa inoltre i requisiti di RandomAccessIterator, complessità è costante.
Original:
However, if InputIt additionally meets the requirements of RandomAccessIterator, complexity is constant.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

[modifica] Esempio

#include <iostream>
#include <iterator>
#include <vector>
 
int main() 
{
    std::vector<int> v{ 3, 1, 4 };
 
    auto distance = std::distance(v.begin(), v.end());
 
    std::cout << distance << '\n';
}

Output: 

3

[modifica] Vedi anche
avanza di un iteratore per distanza data
Original:
advances an iterator by given distance
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

(funzione) [modifica]
Estratto da "https://it.cppreference.com/mwiki/index.php?title=cpp/iterator/distance&oldid=25876"