C++ Vector cbegin
This function is used to point the first element of the vector container.
cbegin vs begin
The cbegin function returns the constant iterator while begin function returns an iterator. The elemencpp tutorialed by the end function can be modified but not by cend function.
Syntax
Consider a vector 'v'. Syntax would be:
Example
const_iterator itr=v.cbegin();
Parameter
It does not contain any parameter.
Return value
It returns the constant iterator pointing to the first element of the vector.
Example 1
Let's see a simple example.
Example
#include <iostream>
#include<vector>
using namespace std;
int main()
{
vector<int> v{1,2,3,4,5};
vector<int>::const_iterator itr=v.cbegin()+2;
*itr=6;
std::cout<<*itr;
return 0;
}
Output:
In this example, it shows an error as we are trying to modify the value using cbegin function which is not possible in this case.
Example 2
Let's see a another simple example.
Example
#include <iostream>
#include<vector>
using namespace std;
int main()
{
vector<string> v{"C","C++","cpp",".Net"};
vector<string>::const_iterator citr;
citr=v.cbegin()+1;
cout<<*citr;
return 0;
}
Output:
In this example, cbegin function is incremented by 1 to access the second element of the vector.