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The member begin has two overloadings one of them is const_iterator begin() const;. There's also the cbegin const_iterator cbegin() const noexcept;. Both of them returns const_iterator to the begin of a list. What's the difference?
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vector::begin() begin() function is used to return an iterator pointing to the first element of the vector container. begin() function returns a bidirectional iterator to the first element of the container.
begin: Returns an iterator pointing to the first element in the sequence. cend: Returns a const_iterator pointing to the past-the-end element in the container. end: Returns an iterator pointing to the past-the-end element in the sequence.
The set::cbegin() is a built-in function in C++ STL which returns a constant iterator pointing to the first element in the container. The iterator cannot be used to modify the elements in the set container.
vector::begin() function is a bidirectional iterator used to return an iterator pointing to the first element of the container.
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<int> vec; const std::vector<int> const_vec; vec.begin(); //iterator vec.cbegin(); //const_iterator const_vec.begin(); //const_iterator const_vec.cbegin(); //const_iterator If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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