How to implement a global function function in C++

Hasini · #1 30-Jan-2009, 03:13

Hi,

Could you tell me how to declare and implement a global function in C++, which can be accessed from any of the class in a particular application.

My requirement is to programmatically terminate a MFC application from a generic C++ class added to the application. I found the following method which is supposed to be implemented as a global function.

CPP / C++ / C Code:

void ExitMFCApp()
   {
        // same as double-clicking on main window close box
        ASSERT(AfxGetMainWnd() != NULL);
        AfxGetMainWnd()->SendMessage(WM_CLOSE);
   }

but I could not find the correct way to implement a global function.
Any help would be greatly appreciated.
Thank you very much in advance.
regards,
Haini.

nowocien · #2 31-Jan-2009, 00:09

well im just a begginer but I would assume create an implemintation file, ExitMFC.cpp for example or add the function to an existing one and declare the prototype in the header.h file used by all other modules?

DAn

Hasini · #3 31-Jan-2009, 00:25

Hi,
Thanks for replying. But my concern is where in the header file I declare the prototype. If I declare a prototype of a function in a header file of a particular class, that function is accessible only within the scope of that class. But I need the function to be globally visible.
Thank you.
regards,
Hasini.

fakepoo · #4 02-Feb-2009, 08:45

Quote:

Originally Posted by Hasini

If I declare a prototype of a function in a header file of a particular class, that function is accessible only within the scope of that class.

This is not true. You can mix class definitions and function prototypes as you wish. You can put multiple class definitions in the same header file if you wish. Here is an example:

CPP / C++ / C Code:

// MyHeader.h

// Global Function Prototype
void MyGlobalFunction();

// Class A
class A
{
public:
  int a;
};

// Class B
class B
{
public:
  int b;
};

You may also need to use the extern "C" {} syntax around your C code in order to avoid name mangling.

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How to implement a global function function in C++

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