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flex: How do I use my own I/O classes in a C++ scanner?

 
 How do I use my own I/O classes in a C++ scanner?
 =================================================
 
 When the flex C++ scanning class rewrite finally happens, then this sort
 of thing should become much easier.
 
    You can do this by passing the various functions (such as
 'LexerInput()' and 'LexerOutput()') NULL 'iostream*''s, and then dealing
 with your own I/O classes surreptitiously (i.e., stashing them in
 special member variables).  This works because the only assumption about
 the lexer regarding what's done with the iostream's is that they're
 ultimately passed to 'LexerInput()' and 'LexerOutput', which then do
 whatever is necessary with them.
 

Info Catalog flex: How do I track the byte offset for lseek()? flex: FAQ flex: How do I skip as many chars as possible?