CODEWITHSUNDEEP
c++boost-spirit
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Reputation: 4178

Pass symbol table as inherited attribute to boost spirit rule

I have a couple of symbol tables on which I want to inhibit partial matching.

Reading across some questions, I figured it can be done using the distinct directive.

However, adding distinct(char_("a-zAZ09_"))[no_case[my_symb_1]]; each time a symbol table is referenced in the grammar is reducing readability. So I tried to make a rule that accepts a symbol table and returns its matching value:

qi::rule<Iterator, Operation(const qi::symbols<char, Operation>&)> no_partial_match;

no_partial_match %= distinct(char_("a-zAZ09_"))[no_case[lazy(_r1)]];

And use it later in the grammar:

some_rule = no_partial_match(my_symb_1) >> int_;

but it fails with:

    const boost::spirit::qi::symbols<char,Operation,boost::spirit::qi::tst<Char,T>,boost::spirit::qi::tst_pass_through>::adder
 &boost::spirit::qi::symbols<Char,T,boost::spirit::qi::tst<Char,T>,boost::spirit::qi::tst_pass_through>::adder::operator
 ()(const Iterator &,const Iterator &,const T &) const': expects 3 arguments - 1 provided

How to achieve this?

(PS: I'm aware of the generic solution provided in the comments here, but I'm looking for a simpler approach for this specific symbol table signature and not a generic one.)

Upvotes: 0

Views: 116

Answers (1)

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Reputation: 4178

Got it, has to wrap the symbol table in phx::ref(...)

like this

some_rule = no_partial_match(phx::ref(my_symb_1)) >> int_;

Upvotes: 1

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