* order would be different, the %priority_queue will not re-sort * by other means, and change their data such that the sorting * and removed from, the %priority_queue using the * Sorting of the elements takes place as they are added to, * No equality/comparison operators are provided for * which is a typedef for the second Sequence parameter, and push, pop, and top, which are standard %queue operations. * Members not found in "normal" containers are container_type, * can be anything defining a strict weak ordering. * The third template parameter supplies the means of making * and random-access iterators, such as std::deque or an
* any type that supports front(), push_back, pop_back,
It defaults to std::vector, but it can be * The second template parameter defines the type of the underlying * interface requirements are met (e.g., iterators). Very few of the standard container/sequence The wrapper is what enforces priority-based sorting
* another container, and provides a wrapper interface to that * This is not a true container, but an adaptor. * A standard container automatically sorting its contents. On my implementation prioroty_queue is described as /** Used only through their specialized interfaces. Particular, adapters do not provide iterators they are intended to be As can be seen from its definition, (as Bjarne Stroustrup says):Ĭontainer adapter provides a restricted interface to a container. In C++ STL prioroty_queue is thus one of the sequence adapters - adaptors of basic containers (vector, list and deque are basic because they cannot be built from each other without loss of efficiency), defined in header ( in my case actually). Priority_queue referes to abstract data type defined entirely by the operations that may be performed on it. Is no standard support for the decrease/increase-key operation. Which wraps these facilities in a container-like class. It also provides the container adaptor priority_queue, The iterators as a reference to an array, and uses the array-to-heapĬonversion. Heaps), which operate on arbitrary random access iterators. The C++ Standard Template Library provides the make_heap, push_heapĪnd pop_heap algorithms for heaps (usually implemented as binary Int heap_extract_max(std::deque &A, int heapsize)Ī = std::numeric_limits::min() int j = max_heapify(A, largest, heapsize) įor(int i = (A.size() - 1) / 2 i >= 0 i-) Void max_heapify(std::deque &A, int i, int heapsize) Is this sufficient to call it an implementation or do I need to put it in a designated priority queue class? #ifndef MAX_PRIORITYQ_H What I have below is all the methods for a priority queue implementation. I guess my question is whether having a collection of functions is equivalent to storing them in some class and using them through a class or just using the functions themselves. What I mean is if I have a function to build a heap and functions to do operations like insert and delete, do I need to put all these functions in a class or can I just use the instructions by calling them in main. Is this the correct way to interpret a priority queue? I know you can build priority queues in different ways but if I were to build a priority queue from a heap is it necessary to create a priority queue class and give instructions for building a heap and the queue operations or is it not really necessary to build the class? It seems that a priority queue is just a heap with normal queue operations like insert, delete, top, etc.
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