How to pass a parameter to a function that is called on an event?

C++ newbie: how can I store long member functions of a class in a separate file, but still access the class?

• Hi everyone: Sorry, my question probably is not very elegantly worded! I have written a class in a .cpp file and a .h file. I want to make my code more readable for users. It is very long. So I have created .cpp and .h files for storage called "auxiliary.h/cpp" I have moved a lot of my code into the auxiliary files and I want to access it through functions in my class. For example, one function in my class is now called readDataFromExternalFile(). The code that reads data from an external file is now in auxiliary.h/cpp. The problem is (sorry, this is probably a silly question!), when I use the function, stuff (data members AND functions) I need in the class is now out of scope. My question is, is there a simple way of making the class see the auxiliary files? I know all about passing items by reference, but things get complicated (particularly with passing template functions) and the function parameter lists get very, very long when I pass all items that I need by reference. One thing I tried was passing an INSTANCE of the class as an argument/parameter in each function that gets stuff from the auxiliary files. But this results in "instanceName not declared in this scope" and I guess it does seem like a circular way of doing things. Any suggestions would be very, very much appreciated! Thanks.

• Answer:

  i dont see any problem in that. Just make sure you Include you class file by #include <FileName.h> and you make an Object of class in main Program. You can access all member functions using that object in main program.