BlitzMax dll executing a C++ function pointer

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Leadwerks

Since C++ can't access BlitzMax lists, here is my function to iterate through all entities in the world. What would the C++ end of this look like?

Function dll_ForEachEntityDo(func:Byte Ptr) "win32"
    Local entity:TEntity
    Local callback:Int(hentity:Int) "win32"
    callback=func
    For entity=EachIn currentworld().entities
        If callback(entity.handle)=0 Return
    Next
EndFunction