vector::begin

vector::begin

Return iterator to beginning

Returns an iterator pointing to the first element in the ​​vector​​.

Notice that, unlike member ​​vector::front​​​, which returns a reference to the first element, this function returns a​​random access iterator​​ pointing to it.

If the container is ​​empty​​, the returned iterator value shall not be dereferenced.

Parameters(参数)

none

Return Value

An iterator to the beginning of the sequence container.

If the ​​vector​​ object is const-qualified, the function returns a const_iterator. Otherwise, it returns an iterator.

Member types iterator and const_iterator are ​​random access iterator​​ types (pointing to an element and to a const element, respectively).

// vector::begin/end#include #include using namespace std;int main (){ vector myvector; for (int i=1; i<=5; i++) myvector.push_back(i); cout << "myvector contains:"; for (vector::iterator it = myvector.begin() ; it != myvector.end(); ++it) cout << ' ' << *it; cout << endl; return 0;}

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// vector::begin/end#include #include using namespace std;int main (){ vector myvector; for (int i=1; i<=5; i++) myvector.push_back(i); cout << "myvector contains:"; vector::iterator it; for (it = myvector.begin() ; it != myvector.end(); ++it) cout << ' ' << *it; cout << endl; return 0;}

Output:

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