visitor pattern for boost::any

Question

I found this https://gist.github.com/2945472 but I need an implementation that does not depend on c++11. I tried my hand at converting it to use only boost, but I\'m having

Answer 1

Try to use extendable any https://sourceforge.net/projects/extendableany/?source=directory.

struct f_method
{
    typedef void (boost::mpl::_1::* signature) () const;

    template 
    struct wrapper
        : public T
    {
        void f() const
        {
            return this->call(f_method());
        }
    };

    struct implementation
    {
        void operator() (int i) const
        {
           std::cout << "fa(" << i << ")" << std::endl;
        }

        void operator() (abc) const
        {
           std::cout << "fb(abc())" << std::endl;
        }

        template 
        void operator() (const T& t) const
        {
            std::cout << "Errr" << std::endl;
        }
    };
};

typedef xany > any;

int main() {
    std::vector xs;
    xs.push_back(1);
    xs.push_back(abc());
    xs.push_back(1.5);

    for (auto it=xs.begin(); it!=xs.end(); ++it)
        (*it).f();
}