std::begin

 

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Reguläre Ausdrücke Bibliothek (C++11)

Atomare Operationen Bibliothek (C++11)

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Iterator Bibliothek

Iterator Primitiven 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
Iterator Adaptern 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
Stream-Iteratoren 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
Iterator Operationen 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)
Reichen Zugang 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)	(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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
array	-	ein Array von beliebigem Typ 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.

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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std::begin(std::initializer_list) (C++11)	spezialisiert 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. (Funktions-Template)
std::begin(std::valarray) (C++11)	spezialisiert 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. (Funktions-Template)

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

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