[7ragon5ly]

I've written a class that loads a text file.
Calling it from main is

Extra R("dream.txt");
	R.show();

but how would I call it from a different class.

[muballitmitte]

put that that code in one of the members of the class

#include "extra.h"

class newc
{
  public:
   void method();
};

void newc::method()
{
Extra R("dream.txt");
R.show();
}

[CTphpnwb]

If you want to call the object from within another object's method, pass the object by reference. That should avoid any scope issues.