Namespace
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std::distance

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>
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.
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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.
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Indice

[modifica] Parametri

first -
iteratore che punta al primo elemento
Original:
iterator pointing to the first element
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last -
iteratore che punta all'ultimo elemento
Original:
iterator pointing to the last element
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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.
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[modifica] Complessità

Lineare.
Original:
Linear.
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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.
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[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
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(funzione) [edit]