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std::begin

De cppreference.com
< cpp‎ | iterator

 
 
Biblioteca Iterator
Primitivas iterador
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
Adaptadores iterador
Original:
Iterator adaptors
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reverse_iterator
Iteradores Stream
Original:
Stream iterators
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istream_iterator
ostream_iterator
istreambuf_iterator
ostreambuf_iterator
Operaciones iterador
Original:
Iterator operations
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advance
distance
prev(C++11)
next(C++11)
Rango de acceso
Original:
Range access
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begin(C++11)
end(C++11)
 
Defined in header <iterator>
template< class C >
auto begin( C& c ) -> decltype(c.begin());
(1) (desde C++11)
template< class C >
auto begin( const C& c ) -> decltype(c.begin());
(2) (desde C++11)
template< class T, size_t N >
T* begin( T (&array)[N] );
(3) (desde C++11)
Devuelve un iterador para el comienzo de la c contenedor determinado o matriz array .
Original:
Returns an iterator to the beginning of the given container c or array array.
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Contenido

[editar] Parámetros

c -
un recipiente con un método begin
Original:
a container with a begin method
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array -
una matriz de tipo arbitrario
Original:
an array of arbitrary type
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[editar] Valor de retorno

un iterador al inicio de c o array
Original:
an iterator to the beginning of c or array
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[editar] Notas

Además de estar incluido en <iterator>, std::begin se garantiza que estén disponibles si alguno de los encabezados se incluyen los siguientes: <array>, <deque>, <forward_list>, <list>, <map>, <regex>, <set>, <string>, <unordered_map>, <unordered_set> y <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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[editar] Especializaciones

Especializaciones personalizados de std::begin podrán establecerse clases que no exponen un adecuado begin() función miembro, sin embargo, puede ser iterado. Los siguientes especialidades vienen dados por la biblioteca estándar:
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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se especializa std::begin
Original:
specializes std::begin
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(función de plantilla) [edit]
se especializa std::begin
Original:
specializes std::begin
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(función de plantilla) [edit]

[editar] Ejemplo

#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

[editar] Ver también

(C++11)
devuelve un iterador al extremo de un recipiente o de matriz
Original:
returns an iterator to the end of a container or array
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(función) [edit]