Question

In the h file i declare:

static IDataSynchronization& sync_data_;

But in the cpp , I have compilation error for sync_data_ :

IDataSynchronization& MasterSlaveSynchronize::sync_data_;

Error is :

MasterSlaveSynchronize::sync_data_ declared as reference but not initialized

I can , but dont want to declare is as a pointer and i want to learn what is the problem here and if there is a way to bypass this.

I cannot initialize at declaration , because this is kind of callback that will pass at setup (no constructor , static setup).

Thank you

Answer 1

You can, but you need to initialize it:

IDataSynchronization& MasterSlaveSynchronize::sync_data_ = something;