Re: [boost] Simple object factory: Checking signatures at runtime

7 Sep 2007

      AMDG

Marco Costalba <mcostalba <at> gmail.com> writes:
...
At compile time it's not a problem, also is not a problem to check for
the same signature parameter types at runtime.
The real problem is to support automatic conversions (int -> double,
derived* -> base*) at runtime.
I would try this

struct implicit_conversion {
    const std::type_info* from_type;
    const std::type_info* to_type;
    void* (convert)(void*);
    void (*destroy)(void*);
}

class implicit_conversion_set {
    std::set<implicit_conversion> conversions;
};

template<class R>
class dispatcher {
    implicit_conversion_set conversions;
    R (*f0)();
    std::map<tuple<const std::type_info*>, R(*)(void*)> f1;
    std::map<tuple<const std::type_info*, const std::type_info*>,
             R(*)(void*, void*)> f2;
    //...
};

i.e. implicit conversions need to be registered.

In Christ,
Steven Watanabe