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    std::begin

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    <metanoindex/>

     
    C++
     
    Iterator Bibliothek
    Iterator Primitiven
    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
    Iterator Adaptern
    Original:
    Iterator adaptors
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    reverse_iterator
    Stream-Iteratoren
    Original:
    Stream iterators
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    istream_iterator
    ostream_iterator
    istreambuf_iterator
    ostreambuf_iterator
    Iterator Operationen
    Original:
    Iterator operations
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    advance
    distance
    prev(C++11)
    next(C++11)
    Reichen Zugang
    Original:
    Range access
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    begin(C++11)
    end(C++11)
     
    <tbody> </tbody>
    definiert in Header <iterator>
    template< class C > auto begin( C& c ) -> decltype(c.begin());
    		 (1) (seit C++11)
    template< class C > auto begin( const C& c ) -> decltype(c.begin());
    		 (2) (seit C++11)
    template< class T, size_t N > T* begin( T (&array)[N] );
    		 (3) (seit C++11)
    Gibt einen Iterator zu Beginn des angegebenen Container c oder Array array .
    Original:
    Returns an iterator to the beginning of the given container c or array array.
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    Parameter

    c -
    einen Behälter mit einer begin Methode
    Original:
    a container with a begin method
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    array -
    ein Array von beliebigem Typ
    Original:
    an array of arbitrary type
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    Rückgabewert

    ein Iterator an den Anfang des c oder array
    Original:
    an iterator to the beginning of c or array
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    Notes

    Neben der in <iterator> enthalten ist, wird std::begin garantiert zur Verfügung stehen, wenn eine der folgenden Header enthalten sind: <array>, <deque>, <forward_list>, <list>, <map>, <regex>, <set>, <string>, <unordered_map>, <unordered_set> und <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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    Spezialisierungen

    Benutzerdefinierte Spezialisierungen std::begin kann für Klassen, die nicht aussetzen müssen eine geeignete begin() Member-Funktion zur Verfügung gestellt werden, kann aber wiederholt werden. Die folgenden Spezialisierungen sind bereits von der Standard-Bibliothek zur Verfügung:
    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)
    spezialisiert std::begin
    Original:
    specializes std::begin
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    (Funktions-Template) [edit]
    (C++11)
    spezialisiert std::begin
    Original:
    specializes std::begin
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    (Funktions-Template) [edit]

    Beispiel

    #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

    Siehe auch

    (C++11)
    liefert einen Iterator auf das Ende eines Containers oder eines Arrays
    Original:
    returns an iterator to the end of a container or array
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    (Funktion) [edit]