Difference between begin and cbegin

#1

what is the difference between the begin and the cbegin iterator in list class… i didnt understand what is meant by the line that it points to a const value in the list

#2

begin vs cbegin
begin vs cbegin1440×855 186 KB

#3

what is the concept of constant iterators

#4

begin() returns the iterator to beginning while cbegin() returns const_iterator to beginning. Basic difference between these two is iterator (i.e begin()) lets you change the value of object it is pointing to and const_iterator will not let you change the value of the object.

For example:

vector<int> v{10,20,30,40,50};
vector<int> :: iterator it;

for(it = v.begin(); it != v.end(); it++)
{
*it = *it - 10;
}

This is allowed. Vector Values changes to {0,10,20,30,40}

for(it = v.cbegin();it != v.cend();it++)
{
 *it = *it -10;
}

This is not allowed. It will throw error.

#5

then what is the usage of constant iterators and how will this cbegin function be used… pls give an example

#6

They are just used when you don;t want to change their value, but just use their value.
Check this link maybe https://www.geeksforgeeks.org/const-vs-regular-iterators-in-c-with-examples/