I have requirement: for a function, I get the input as a stream of numbers. I mean, the function keeps on getting called with single number in each call. I am using std::q
queue
is just an adapter for some underlying container, by default a deque
, with restricted function (as you noted here). If you want the full blown function use the underlying deque
instead of queue
.
According to http://www.cplusplus.com/reference/stl/queue/,
queues are implemented as containers 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 it elements.
which means that the queue uses an already existing container, and is just really is an interface to this container as a FIFO queue.
This means queues are not meant to be cleared. If you need to clear a queue, this means you actually need to use an object that is not a queue, and therefore you should instead use the actual underlying container type, being a deque by default.
Added this to my growing list of 'make STL readable' functions:
template <typename T>
void Clear(std::queue<T>& Queue)
{
Queue = std::queue<T>(); // Assign to empty queue
}
It's just a wrapper around sellibitze's excellent answer, but means I don't have to also add a comment every time I use the technique.
Apart from what has been said already, you can clear a queue very easily:
queue<int> q;
...
q = queue<int>(); // Assign an empty queue
or in C++11
q = {};