QueueT

QueueT is a common informal name used to denote a generic or templated queue type in programming, where T represents the element type. It refers to an abstract data type that stores elements in a first-in, first-out (FIFO) order and is typically provided in standard libraries as a parameterized container (for example, Queue<T> in many languages). The name QueueT emphasizes that the queue is generic and can hold any data type specified by T.

The canonical operations associated with QueueT are enqueue (insert at the back), dequeue (remove from the front), peek or front (inspect the front element without removing it), isEmpty, and size. Implementations vary: linked lists, circular buffers on arrays, and dynamically resizing arrays are common choices. Variants include bounded queues with fixed capacity, unbounded queues that grow as needed, lock-free or concurrent queues for multi-threaded environments, and double-ended queues (deques) that allow insertion and removal at both ends.

Performance characteristics depend on the implementation. Typical implementations provide O(1) time for enqueue and dequeue, with array-based implementations offering amortized O(1) for dynamic resizing. QueueT is widely used in breadth-first search, task scheduling, producer-consumer buffering, event handling, and streaming pipelines. Many languages and frameworks supply specialized queue types and concurrency-safe variants, and the pattern is a fundamental building block in algorithm and systems design.