stack and heap objects

I want to simply create stack based objects but I have the following problem. I have a class which will contain a stack based static Queue. But I need to access it from my main.cpp source file, so I'm not sure how to declare it within my main.cpp file. If it's a stack based static queue, what do I write in my main.cpp? Also, what type of "Accessor" should I write for it in my class in order to get it. What's the return type of the "Accessor method? It shouldn't be a "*", should it? Do i return the "&" address of the stack based queue in order to access it in main? Then is that variable in main that references it a pointer? I'm a little confused..Also, as long as my main.cpp includes class A's header, can I call the accessor for the Queue inside main?

Code:

---

class A
{
    public:

    static Queue myQueue; //on the stack

    Queue getMyQueue(); //accessor for it
}

Queue A::myQueue; //declare the stack variable

Queue A::getMyQueue()
{
    return &Queue; //in order to access it out of the class and insert into it
}

main.cpp (assuming all proper header inclusions)
-----------

Queue myQueue; //want to access it and insert into it

myQueue = A::getMyQueue();

myQueue.insert( blah );  //in order to keep in stack based?

---

I am confused by your terminology.

If you want a static Queue for your class A (meaning only one Queue exists for all instances of A), and you want to access that from main, you could return a reference or pointer like this:

Code:

---

// return reference
Queue& A::getMyQueue() { return Queue; }

---

Code:

---

// return pointer
Queue* A::getMyQueue() { return &Queue; }

---

I prefer the first, since the syntax is cleaner and it indicates that the return value will never be null. To use it, you could do either of the following:

Code:

---

A::getMyQueue().insert( blah );

// or

Queue& myQueue = A::getMyQueue();
myQueue.insert( blah );

---

Of course, in your example, myQueue is public so there really isn't a need for an accessor and you can just do this:

Code:

---

A::myQueue.insert( blah );

---

Is that what you're looking for? It doesn't have anything to do with stack vs heap, though.

ya, that makes sense, thanks.

Another problem that arose for me is trying to return a formatted string of all a classes variables. I'm trying to use stringstring but am having no luck with anything longer than one variable. How can I properly format an output string, that contains all of a class's variables?

Code:

---


string classA::print()
{

stringstream in
string out = " ";

in << variableOne
in << "  ";
in << variableTwo;
in << "  ";
in << variableThree;

in >> out;

return out;
}

---

Note that "static" means that it's NOT stack-based, but rather "like a global".

--
Mats

>> How can I properly format an output string, that contains all of a class's variables?
Your code is pretty close, although it's missing some semi-colons. Did you try it?

You don't actually need the out variable. Once you have streamed the information into the in variable, just return in.str(). The str() function of a stringstream returns the string that is in the stream.