Is there a way to do a #define inside of another #define?

Question

I know that I am trying to shoot myself in the leg ;) However, it will allow me to make the rest (big amount) of code smaller and more readable.

Is there any tricky way to create preprocessor macro inside of another preprocessor macro?

Here is the example, what I am looking for. My real scenario is more complex

// That's what I want to do and surely C++ doesn't like it. #define MACROCREATER(B) #define MACRO##B B+B  void foo() {  MACROCREATOR(5) // This should create new macro (#define MACRO5 5+5)   int a = MACRO5; // this will use new macro } 

Answer 1

The C++ Standard says (16.3.4.3):

The resulting completely macro-replaced preprocessing token sequence [... of the macro expansion...] is not processed as a preprocessing directive even if it resembles one...

So no, there is no 'official' way of achieving what you want with macros.

Answer 2

No. Even if a macro expands into something that looks like a preprocessing directive, the expansion is not evaluated as a preprocessing directive.