Returns a const random-access iterator to the first element in the container.
const_iterator cbegin() const;
Return Value
A const random-access iterator addressing the first element in the deque Class or to the location succeeding an empty deque. You should always compare the value returned with deque::cend or deque::end to ensure it is valid.
Remarks
With the return value of deque::cbegin, the deque object cannot be modified.
Example
// deque_cbegin.cpp
// compile with: /EHsc
#include <deque>
#include <iostream>
int main()
{
using namespace std;
deque<int> c1;
deque<int>::const_iterator c1_Iter;
c1.push_back(1);
c1.push_back(2);
cout << "The deque c1 contains elements:";
c1_Iter = c1.cbegin();
for (; c1_Iter != c1.cend(); c1_Iter++)
{
cout << " " << *c1_Iter;
}
cout << endl;
// The following line would be an error because iterator is const
// *c1.cbegin() = 200;
}
The deque c1 contains elements: 1 2
Requirements
Header: <deque>
Namespace: std