[Boost-users] Determine Parent Class from boost::any

Subject: [Boost-users] Determine Parent Class from boost::any
From: Yan Cheng Cheok (yccheok_at_[hidden])
Date: 2009-11-23 11:18:28

May I know is there any way to determine parent class from boost::any?

#include <iostream>
#include <boost/any.hpp>

class a {
public:
    virtual ~a() {}
};

class b : public a {
};

bool is_class_a(const boost::any& any)
{
    return boost::any_cast<a>(&any) != 0;
}

bool is_class_a_v2(const boost::any& any)
{
    try
    {
        boost::any_cast<a>(any);
        return true;
    }
    catch(const boost::bad_any_cast &)
    {
        return false;
    }
}

int main()
{
    std::cout<< is_class_a(b())<< std::endl;    // return 0. but i wish to return 1.
    std::cout<< is_class_a(a())<< std::endl;    // return 1.

    std::cout<< is_class_a_v2(b())<< std::endl; // return 0. but i wish to return 1.
    std::cout<< is_class_a_v2(a())<< std::endl; // return 1.
}