QT C++ DATA Structures

[ELIF]

How to access any element of stack or queue without pop() operation in c++ ?

[JonB]

@ELIF
Then why not say so from the start?! So your question is not connected to Qt C++ data strictures structures after all. You can see the methods of std::queue from the docs:

The std::queue class is a container adaptor that gives the programmer the functionality of a queue - specifically, a FIFO (first-in, first-out) data structure.

The class template acts as a wrapper to the underlying container - only a specific set of functions is provided. The queue pushes the elements on the back of the underlying container and pops them from the front.

Accessors are front() and back() It's a queue. So you cannot access middling elements, and why would you want to if you are choosing to use a queue?

However, @JoeCFD's std::dequeue does allow access to middling elements. See Access c++ queue elements like an array for a discussion.

[JonB]

@ELIF
Depends what library you are using for "stack" or "queue".

[ELIF]

I will use queue.

[JoeCFD]

std::deque may be a better option.

[JonB]

@ELIF
What queue? std::queue?

[ELIF]

@JonB yes , ofcourse.

[JonB]

@ELIF
Then why not say so from the start?! So your question is not connected to Qt C++ data strictures structures after all. You can see the methods of std::queue from the docs:

The std::queue class is a container adaptor that gives the programmer the functionality of a queue - specifically, a FIFO (first-in, first-out) data structure.

The class template acts as a wrapper to the underlying container - only a specific set of functions is provided. The queue pushes the elements on the back of the underlying container and pops them from the front.

Accessors are front() and back() It's a queue. So you cannot access middling elements, and why would you want to if you are choosing to use a queue?

However, @JoeCFD's std::dequeue does allow access to middling elements. See Access c++ queue elements like an array for a discussion.

[ELIF]

@JonB said in QT C++ DATA Structures:

strictures

Thank you :)