Akim Demaille 1f4dd2671a c++: provide symbol constructors per type ...

On

    %token <int> FOO BAR

we currently generate make_FOO(int) and make_BAR(int).  However, in
order to factor their scanners, some users would also like to have
make_symbol(tok, int), where tok is FOO or BAR.  To ensure type
safety, add assertions that do check that value type and token type
match.  Bind this assertion to the parse.assert %define variable.

Suggested by Frank Heckenbach.
http://lists.gnu.org/archive/html/bug-bison/2018-12/msg00034.html
Should also match expectations from Аскар Сафин.
http://lists.gnu.org/archive/html/bug-bison/2018-12/msg00023.html

* data/variant.hh: Use b4_token_visible_if where applicable.
(_b4_type_constructor_declare, _b4_type_constructor_define): New.
Use them.

2018-12-22 13:05:28 +01:00

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