Call function from another class.

[n00bStudent]

Hello forum! A short question regarding functions.

My example is the following:

// somewhere in class A

//in the .h file : public: int a;

//In the .cpp

int A::doSomething()
{
   a++
   return a;
}

// Constructor of class B



B::B()
{
       random_private_value = A::doSomething();
}

Class A is connected with class B with B * lnkB;


The error that I have is:


B.cpp(13) : error C2653: 'A' : is not a class or namespace name
B.cpp(13) : error C3861: 'doSomething': identifier not found


Ok obviously I do something wrong in the connection between the classes and the call of the function from class A...

Is that possible? If yes what wrong I have in my approach?

[jim80y]

This function call A::doSomething() means you're calling a static function doSomething() of class A.

Either a) you haven't declared A::doSomething() to be static in the definition of class A, or b) you didn't mean to use static function(s).

If b), then you'll need to have an instance of class A and then use that, for example:

A myInstanceOfA;
myInstanceOfA.doSomething();

Edit: Actually, your error message looks like you need to #include class A's header from B's.

Cheers,
Jim