Hi Hartmut,
IIUC you want to discard the information about the macro definition and make the token stream look like it was the original input stream. This is not possible with Wave as it is.
It seems that we agree, but let me clarify my previous problem description so that we know that I put this in a clear way. I am using preprocessor hooks to fetch the macro before and after expansion. My problem is that the macro after expansion has the positions of the macro definition while I want it to have the positions of the current line. The reason why I want this is that I want to compare the position of tokens in Wave with the positions of constructs in an Abstract Syntax Tree, so e.g identifier 'x' in token stream is found to have the same positions as an identifier 'x' of a variable declaration in the AST.
My first thought was to use boost::transform_iterator on top of the wave iterators and to maintain a separate file position based on the tokens passed through it. But this doesn't work, because this iterator kicks in every time the transform_iterator is dereferenced, so you end up correcting the current file position each time. Clearly indirection doesn't work easily here...
So I'm not sure yet, how to achieve this, but at least I have some ideas, at which points this could be injected into Wave. Please give me some more time to contemplate...
Thank you very much for looking into this! It is very much appreciated.
Do you have any thought's on that?
I am not so versed in the implementation details that I feel confident suggesting too much, but I will contemplate on this too. A separate position would be great, but in the absence of that maybe the positions could be changed through a normalization stage after macro expansion although I am worried about that not working too well with the preprocessor hooks. Thanks Andreas