Akim Demaille 94f70bd861 c++: clean a few issues wrt special tokens ...

The C++ implementation of LAC did not skip the $undefined token,
probably because it was not exposed.  Expose it, and use clearer
names.

* data/skeletons/c++.m4: Don't define undef_token_ in yytranslate_,
but...
* data/skeletons/lalr1.cc (yy_undef_token_): here.
Use a more precise type to define yy_undef_token_ and yy_error_token_.
Unfortunately we move from a compile-time value defined via an enum to
a static const member.  Eventually we should make it constexpr.
Make LAC implementation more alike yacc.c's one.

2019-12-01 08:08:19 +01:00

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