What are the different types of queue implementations in C++?

What are the different types of queue implementations in C++?

In C++, there are several types of queue implementations, including:

1. Array-based Queue: Uses a fixed-size array to store elements.
2. Linked List Queue: Uses a linked list to allow dynamic sizing.
3. Circular Queue: A circular version of the array-based queue to optimize space.
4. Priority Queue: Elements are stored based on priority rather than order of insertion.

Can you explain how a circular queue works?

Sure! A circular queue connects the end of the queue back to the front, forming a circle. This allows for efficient use of space, as it can reuse empty slots created by dequeued elements. When the rear pointer reaches the end of the array, it wraps around to the front if there is space available.

What are the advantages of using a linked list for queue implementation?

Using a linked list for queue implementation has several advantages:

1. Dynamic Size: It can grow and shrink as needed, unlike a fixed-size array.
2. No Wasted Space: It only uses as much memory as needed for the elements.
3. Efficient Insertions/Deletions: Adding or removing elements from the front or back is efficient.

Are there any built-in queue classes in C++?

Yes, C++ provides a built-in queue class in the Standard Template Library (STL). You can use std::queue, which is a container adapter that provides a FIFO (first-in, first-out) data structure. It can be implemented using other containers like deque or list.