Does anybody can decipher what this Macro means?

[sulacco]

Does anybody can decipher what this Macro means?
...
#define RUNTIME_CLASS(class_name) ((CRuntimeClass*)(&class_name::class##class_name))
I don't understand the last words:
&class_name::class##class_name

 

[Salem]

## is the concatentation operator for the preprocessor.

So when you say in the code

RUNTIME_CLASS(MyClass);

The compiler will see that as

((CRuntimeClass*)(&class_name::classMyClass));

--

 

[sulacco]

I understand this but don't get the meaning of this piece:

(&class_name::classMyClass));

 

[PerFnurt]

it means that class_name holds something called classMyClass (which the macro generates).

classMyClass holds info (a CRuntimeClass instance) about class_name.

/Per

_{"It was a work of art, flawless, sublime. A triumph equaled only by its monumental failure."}

 

[cpjust]

Actually, when you run

RUNTIME_CLASS(MyClass);

it should be interpreted as:

((CRuntimeClass*)(&MyClass::classMyClass));