C++ Vector cbegin() function

C++ Vector cbegin() function tutorial for beginners and professionals with examples on assign(), at(), back(), begin(), capacity(), cbegin(), cend(), clear(), crbegin(), crend(), data(), emplace(), end(), front(), rbegin(), resize(), size(), swap() etc.

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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 element pointed by the end() function can be modified but not by cend() function.

Syntax

Consider a vector 'v'. Syntax would be:

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.

#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:

Error

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.

#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:

C++

In this example, cbegin() function is incremented by 1 to access the second element of the vector.

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