if is perfectly legal to put function implementations in the class
prototype.
this is standard c++ behavior.
for example:

class test
{
public:
   test()
   {
       //put constructor code here
   }
};

that way you don't have to have a cpp file. the disadvantage with this is
that you can't compile
a header file in the visual studio IDE, so you will not know if your class
works before you use it somewhere.

kind regards,
   Bruno.