How to make C++-generated parser call yylex in some polymorphic way?

[Oleksii Taran]

Hi all

Is there a way to not call global C-style `yylex` function in generated C++ 
parser? Now I just patch `lalr1.cc` to add pure virtual method `yylex` in 
parser skeleton and override it in subclass. The downside is that I can't use 
vanilla bison, and I must reapply patch on every update.

Do you have any ideas how to overcome this issue?

-- 
Best regards,
Oleksii Taran

smime.p7s
Description: S/MIME cryptographic signature