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I am trying to evaluate a proto expression tree with a custom defined context. I have a struct exp_tag {} using which a create a terminal 

template <typename T>
inline typename proto::result_of::make_expr<exp_tag, T const &>::type
exp_t(T const &t) {
  return proto::make_expr<exp_tag>(boost::cref(t));
}

I create the expression tree as follows :

exp_t(x)

And the tree looks like this 

7exp_tag( 
    terminal(6tensorILm0EE) 
)

In my context I evaluate the tree using function overloads like this :

template<typename A, typename B>
float operator()(proto::tag::plus, A& a, B& b) const {
    auto va = proto::eval(a, *this);
    auto vb = proto::eval(b, *this);
    return va + vb;
}

When I attempt to do this for my exp_t by replacing proto::tag::plus with exp_tag my code doesn't compile.

My guess is that since exp_t is an expression because of proto::make_exr<exp_tag> I can't treat it as a proto::tag but I can't figure out how to do this.

What should I replace proto::tag::plus with in order to evaluate exp_t through the context?

Kirit Thadaka
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    Have you tried `float operator()(exp_tag, A& a) const`? Having a complete example would make trying to help a lot easier... – llonesmiz Apr 12 '17 at 17:42

0 Answers0