What is the difference between cbegin and begin for vector?

Question

The member begin has two overloadings one of them is const_iterator begin() const;. There\'s also the cbegin const_iterator cbegin() const noexcept;

Answer 1

begin will return an iterator or a const_iterator depending on the const-qualification of the object it is called on.

cbegin will return a const_iterator unconditionally.

std::vector vec;
const std::vector const_vec;

vec.begin(); //iterator
vec.cbegin(); //const_iterator

const_vec.begin(); //const_iterator
const_vec.cbegin(); //const_iterator