Namespace
Varianti

std::begin

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< cpp‎ | iterator

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C++
 
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)
 
Elemento definito nell'header <iterator>
template< class C >
auto begin( C& c ) -> decltype(c.begin());
 (1) (dal C++11)
template< class C >
auto begin( const C& c ) -> decltype(c.begin());
 (2) (dal C++11)
template< class T, size_t N >
T* begin( T (&array)[N] );
 (3) (dal C++11)
Restituisce un iteratore all'inizio del c contenitore dato o array array.
Original:
Returns an iterator to the beginning of the given container c or array array.
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Indice

[modifica] Parametri

c -
un contenitore con un metodo begin
Original:
a container with a begin method
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array -
una matrice di tipo arbitrario
Original:
an array of arbitrary type
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[modifica] Valore di ritorno

un iteratore all'inizio di c o array
Original:
an iterator to the beginning of c or array
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[modifica] Note

Oltre ad essere incluso nel <iterator>, std::begin è garantito per essere disponibile se una qualsiasi delle seguenti intestazioni sono inclusi: <array>, <deque>, <forward_list>, <list>, <map>, <regex>, <set>, <string>, <unordered_map>, <unordered_set> e <vector>.
Original:
In addition to being included in <iterator>, std::begin is guaranteed to become available if any of the following headers are included: <array>, <deque>, <forward_list>, <list>, <map>, <regex>, <set>, <string>, <unordered_map>, <unordered_set>, and <vector>.
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[modifica] Specializzazioni

Specializzazioni personalizzate di std::begin può essere previsto per le classi che non espongono un adeguato begin() funzione membro, ma può essere iterato. Le specializzazioni sono già fornite dalla libreria standard:
Original:
Custom specializations of std::begin may be provided for classes that do not expose a suitable begin() member function, yet can be iterated. The following specializations are already provided by the standard library:
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(C++11)
specializzata std::begin
Original:
specializes std::begin
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(funzione di modello) [modifica]
(C++11)
specializzata std::begin
Original:
specializes std::begin
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(funzione di modello) [modifica]

[modifica] Esempio

#include <iostream>
#include <vector>
#include <iterator>
 
int main() 
{
    std::vector<int> v = { 3, 1, 4 };
    auto vi = std::begin(v);
    std::cout << *vi << '\n'; 
 
    int a[] = { -5, 10, 15 };
    auto ai = std::begin(a);
    std::cout << *ai << '\n';
}

Output: 

3
-5

[modifica] Vedi anche

(C++11)
ritorna un iteratore alla fine di un contenitore o matrice
Original:
returns an iterator to the end of a container or array
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(funzione) [modifica]
Estratto da "https://it.cppreference.com/mwiki/index.php?title=cpp/iterator/begin&oldid=25875"