Description : This method is used to return a const_iterator pointing to the first element in the container.
Example :
//Run Code To Demonstrate use of set.cbegin()
#include <iostream>
#include <set>
int main ()
{
std::set<int> myset = {50,20,60,10,25};
std::cout << "myset contains:";
for (auto it=myset.cbegin(); it != myset.cend(); ++it)
std::cout << ' ' << *it;
std::cout << '\n';
return 0;
}