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std::begin

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C++
 
Biblioteca Iterator
Primitivas iterador
Original:
Iterator primitives
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Adaptadores de iterador
Original:
Iterator adaptors
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Iteradores fluxo
Original:
Stream iterators
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Operações iterador
Original:
Iterator operations
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(C++11)
(C++11)
Variar de acesso
Original:
Range access
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begin
(C++11)
(C++11)
 
Definido no cabeçalho <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)
Retorna um iterador para o início do c determinado recipiente ou matriz array.
Original:
Returns an iterator to the beginning of the given container c or array array.
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Índice

[editar] Parâmetros

c -
um recipiente com um método begin
Original:
a container with a begin method
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array -
uma matriz do tipo arbitrário
Original:
an array of arbitrary type
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[editar] Valor de retorno

um iterador para o início da c ou array
Original:
an iterator to the beginning of c or array
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[editar] Notas

Além de serem incluídos no <iterator>, std::begin é garantido que se tornam disponíveis, se qualquer um dos seguintes cabeçalhos estão incluídos: <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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[editar] Especializações

Especializações personalizadas de std::begin podem ser fornecidas para as classes que não expõem um adequado begin() função de membro, mas pode ser repetido. Os seguintes especializações já são fornecidas pela biblioteca padrão:
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 especializada
Original:
specializes std::begin
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(modelo de função) [edit]
(C++11)
std::begin especializada
Original:
specializes std::begin
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(modelo de função) [edit]

[editar] Exemplo

#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';
}

Saída: 

3
-5

[editar] Veja também

(C++11)
devolve uma iteração com a extremidade de um recipiente ou de matriz
Original:
returns an iterator to the end of a container or array
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(função) [edit]
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