Re: [Boost-users] Boost.Proto embedding a function calls into expressions

Hi Stefan, Stefan Frehse schrieb:

Hello Boost.Proto,

firstly, thank you very much for your great work for providing such a powerful framework.

My Setup: I defined a grammar, like grammar * grammar, a domain and so on. Based on the domain two evaluator for different contexts are provided. For standard operators that works great. For expression evaluation I have a function defined as follow:

template generate (T& t, Expr const& expr, Arg0 const& arg0, ... ) { call the first or the second evaluator switched by T and passes the value arg0, ... } Therewith, I can write for example, generate (foo, _1 * _2, a, b);

Coming to my problem. I would like to write, generate (foo, _1 * func (_2, _3), a ,b, c); Overall I would like to embedd function calls into the expression and the pass them to the generate function.

I tried to implement a make_expr based on func, but that does not work for me, i.e., compiler error for fmi::ite (_0, _1, _2) (a,b,c);

error: invalid use of incomplete type 'struct fmi::ite_::result, boost::fusion::vector1, boost::fusion::vector1)>'

error: declaration of 'struct fmi::ite_::result, boost::fusion::vector1, boost::fusion::vector1)>' cpp:7:

Can you imaging what the problem is? Otherwise I will attach further cleaned code.

It will be more easier to understand if you can provide a standalone example. Cheers, Kim

Best wishes, sfrehse

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