Return value: This function returns nothing. Parameter: The parameter of this function will be value to be inserted at the end of the queue container. It adds a new element at the end of the queue container. This function is used to insert new elements in the queue container. Parameter: The parameter of this function will be another queue container of a similar type. The type of two queues must be of the same type to swap the content using the queue::swap() function. After swapping two queues contents, it may be possible that the size of the two queues may be different than it was initially before swapping content. This function is used to swap the contents of two queues. The process to remove an element from the queue is also called a dequeue operation. Because of the removal of one oldest element, after using this function, the size of the queue will be reduced by one. The element removed by this function will be the oldest element available in the queue. This function is used to remove an element from the queue container. The member type value_type is a type of element inserted in the queue container. Parameter: The parameter of this function is the value with which we want inserted element to be initialized. The process to insert a new element in the queue is called enqueue operation. This function inserts a new element after its last inserted element. This function can be used to insert a new element in the queue. Return value: This function returns a reference to the last or newest inserted element of the queue container. As the queue is the First In First Out(FIFO) container, the last element is nothing but the newest element present in the queue container. This function can be used to get details or references related to the last element of the queue. Return value: This function returns a reference to the front or first element of the queue container. As the queue is First In First Out(FIFO) container, the front element is nothing but the oldest element present in the queue container.
This function can be used to get details or references related to the front element of the queue. Return value: This function returns size_type member type which is an unsigned integer type. This function is used to check the size or number of member elements of the queue. The return value of the function = false if the queue is non-empty. Return value: The return value of the function = true if the queue is empty with no element inside it. Parameter: There is no parameter value which needs to be provided to this function. This function is used to check whether a queue is empty or filled. The following are different C++ queue functions which are mentioned along with an explanation of each function. value_type: value_type is a type that represents the type of elements stored in the queue container.size_type: size_type is an unsigned integer which will show the number of elements in the queue.container_type: container_type is the member type that provides a type of underlying container which is to be adapted by the queue.Removing/Extracting the content from the queue containerįollowing are the details about C++ queue member types: inserting element in the queue container declaration of queue named queue_sample #include // header file to use queue functionalities in C++
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Please have a look at below sample code to understand how a queue works in C++.Ĭode: // C++ program to understand queue container std:: queue class in C++ also provides many useful in-built member functions for programmers to use with a queue.Īs shown in below figure, if elements are inserted in the order of 1->2->3->4->5 in the queue then they are extracted from the queue in the order of first inserted element will be extracted first and then rest that is in the order of 1->2->3->4->5.
The declared queue here will be worked as FIFO(First In First Out) means element entered first in the queue will be extracted first and element inserted last will be extracted last. For example “queueroll_number“ declares queue named as roll_number with all integer members. Queue in C++ can be declared using syntax explained above. Queue_name is the user-defined name of the queue.ĭata_type is the data type of all members of the queue. To use above syntax for queue in C++, it is important to include #include header file. The syntax for C++ Queue is as below: // Syntax for queue in C++
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