Iterators in C++ STL
Prerequisite : Introduction to Iterators
Iterators are used to point at the memory addresses of STL containers. They are primarily used in sequences of numbers, characters etc. They reduce the complexity and execution time of the program.
Operations of iterators :-
1. begin() :- This function is used to return the beginning position of the container.
2. end() :- This function is used to return the after end position of the container.
The vector elements are : 1 2 3 4 5
3. advance() :- This function is used to increment the iterator position till the specified number mentioned in its arguments.
The position of iterator after advancing is : 4
4. next() :- This function returns the new iterator that the iterator would point after advancing the positions mentioned in its arguments.
5. prev() :- This function returns the new iterator that the iterator would point after decrementing the positions mentioned in its arguments.
The position of new iterator using next() is : 4 The position of new iterator using prev() is : 3
6. inserter() :- This function is used to insert the elements at any position in the container. It accepts 2 arguments, the container and iterator to position where the elements have to be inserted.
The new vector after inserting elements is : 1 2 3 10 20 30 4 5
Types of Iterators :
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