Thread: File-scope objects

I have a class called IssueQueue. I have a function called initialize() which will read arguments from the command line and initialize an IssueQueue object according to the arguments. I have other functions which then need to use the IssueQueue object that was initialized in initialize().

I've tried declaring an IssueQueue outside of all functions to make it global but I received an error about no constructor with zero arguments. In my examples in my first post, IssueQueue would be Foo and initialize would be bar, just to show what I have tried so far.

Passing issue_queue around as an argument seems like a poor design because there are a few classes similar to IssueQueue that I need to do this with. As another reason not to pass it as an argument, all of these functions that use IssueQueue will be called by main and I have no reason to make the IssueQueue object visible to main. All of these functions (except main) will be contained in the same file, though.

dynamic_scheduler.cpp

Code:

IssueQueue issue_queue; //* Error here

void initialize()
{
    int x;
    ... //* Give a value to x
    issue_queue(x);
}

void dispatch()
{
  ...
    Instruction instr = new Instruction(...);
   issue_queue.push(instr);
  ...
}

void execute()
{
  ...
   issue_queue.pop();
  ...
}