std::begin

 

C++

Lenguaje

Cabeceras

Conceptos

Biblioteca de utilidades

Biblioteca de cadenas

Biblioteca de contenedores

Biblioteca de algoritmos

Biblioteca de iteradores

Biblioteca numérica

Biblioteca de entrada/salida

Biblioteca de localización

Biblioteca de expresiones regulares (C++11)

Biblioteca de operaciones atómicas (C++11)

Biblioteca de tareas/subprocesos (C++11)

 

Biblioteca Iterator

Primitivas iterador 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
Adaptadores iterador 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
move_iterator (C++11) back_insert_iterator front_insert_iterator insert_iterator	make_move_iterator (C++11) back_inserter front_inserter inserter
Iteradores Stream 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
Operaciones iterador 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)
Rango de acceso 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)

 

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.

The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

Parámetros

c	-	un recipiente con un método begin Original: a container with a begin method The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
array	-	una matriz de tipo arbitrario Original: an array of arbitrary type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

Valor de retorno

un iterador al inicio de c o array

Original:

an iterator to the beginning of c or array

The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

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>.

The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

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:

The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

std::begin(std::initializer_list) (C++11)	se especializa std::begin Original: specializes std::begin The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (función de plantilla)
std::begin(std::valarray) (C++11)	se especializa std::begin Original: specializes std::begin The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (función de plantilla)

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

Ver también

end (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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (función)