![]() ![]() The priority_queue uses this function to maintain the elements sorted in a way that preserves heap properties (i.e., that the element popped is the last according to this strict weak ordering). The expression comp(a,b), where comp is an object of this type and a and b are elements in the container, shall return true if a is considered to go before b in the strict weak ordering the function defines. Compare A binary predicate that takes two elements (of type T) as arguments and returns a bool. Container Type of the internal underlying container object where the elements are stored.Īliased as member type priority_queue::container_type. Template parameters T Type of the elements.Īliased as member type priority_queue::value_type. This is done automatically by the container adaptor by automatically calling the algorithm functions make_heap, push_heap and pop_heap when needed. Support of random access iterators is required to keep a heap structure internally at all times. By default, if no container class is specified for a particular priority_queue class instantiation, the standard container vector is used. The standard container classes vector and deque fulfill these requirements. The container shall be accessible through random access iterators and support the following operations: The underlying container may be any of the standard container class templates or some other specifically designed container class. ![]() Elements are popped from the "back" of the specific container, which is known as the top of the priority queue. Priority queues are implemented as container adaptors, which are classes that use an encapsulated object of a specific container class as its underlying container, providing a specific set of member functions to access its elements. ![]() This context is similar to a heap, where elements can be inserted at any moment, and only the max heap element can be retrieved (the one at the top in the priority queue). Priority queues are a type of container adaptors, specifically designed such that its first element is always the greatest of the elements it contains, according to some strict weak ordering criterion. ![]()
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