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std::begin

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< cpp‎ | iterator

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C++
 
Bibliothèque Iterator
Primitives Iterator
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
Adaptateurs Iterator
Original:
Iterator adaptors
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reverse_iterator
Itérateurs de flux
Original:
Stream iterators
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istream_iterator
ostream_iterator
istreambuf_iterator
ostreambuf_iterator
Opérations Iterator
Original:
Iterator operations
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advance
distance
prev (C++11)
next (C++11)
Gamme d'accès
Original:
Range access
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begin (C++11)
end (C++11)
 
Déclaré dans l'en-tête <iterator>
template< class C >
auto begin( C& c ) -> decltype(c.begin());
 (1) (depuis C++11)
template< class C >
auto begin( const C& c ) -> decltype(c.begin());
 (2) (depuis C++11)
template< class T, size_t N >
T* begin( T (&array)[N] );
 (3) (depuis C++11)
Retourne un itérateur au début de l'c conteneur donné ou un tableau array .
Original:
Returns an iterator to the beginning of the given container c or array array.
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Sommaire

[modifier] Paramètres

c -
un récipient avec un procédé begin
Original:
a container with a begin method
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array -
un tableau de type arbitraire
Original:
an array of arbitrary type
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[modifier] Retourne la valeur

un itérateur au début de c ou array
Original:
an iterator to the beginning of c or array
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[modifier] Notes

En plus d'être inclus dans <iterator>, std::begin est assuré de devenir disponibles si l'un des en-têtes suivants sont inclus: <array>, <deque>, <forward_list>, <list>, <map>, <regex>, <set>, <string>, <unordered_map>, <unordered_set> et <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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[modifier] Spécialisations

Spécialisations personnalisés de std::begin peut être fourni pour les classes qui n'exposent pas une fonction membre begin() approprié, mais peut être itérée. Les spécialisations suivantes sont déjà fournis par la bibliothèque 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)
std::begin spécialisée
Original:
specializes std::begin
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(fonction générique) [edit]
(C++11)
std::begin spécialisée
Original:
specializes std::begin
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(fonction générique) [edit]

[modifier] Exemple

#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';
}

Résultat : 

3
-5

[modifier] Voir aussi

(C++11)
retourne un itérateur à l'extrémité d'un conteneur ou d'un tableau
Original:
returns an iterator to the end of a container or array
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(fonction) [edit]
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