Handling new types without using RTTI, C++ (gcc)

Handling new types without using RTTI

//Title of this code
//g++  4.8.2

#include <iostream>
#include <vector>
#include <algorithm>
#include <memory>

struct Security;
struct Bond;
struct Stock;

struct Checker
{
    virtual bool check(const Security&) const { return false; };
    virtual bool check(const Bond&) const { return false; }
    virtual bool check(const Stock&) const { return false; }
};

struct Security
{
    //virtual const char * getName() const = 0;
    virtual bool check(const Checker& checker) const = 0;
};

struct Bond : public Security
{
    //const char * getName() const { return "bond"; }
    
    bool check(const Checker& checker) const
    {
        return checker.check(*this);
    }    
};

struct Stock : public Security
{
    //const char * getName() const { return "stock"; }
    
    bool check(const Checker& checker) const
    {
        return checker.check(*this);
    }
};

struct IsBond : public Checker
{
    bool check(const Bond&) const { return true; }
    bool check(const Security&) const { return false; }
};
 
struct IsStock : public Checker
{
    bool check(const Stock&) const { return true; }
    bool check(const Security&) const { return false; }
};

template<class Checker>
struct CheckerFunctor
{
    bool operator()(const std::shared_ptr<Security> sec) const
    { 
        static Checker checker;  
        
        return sec->check(checker);
    }
};

int main()
{
    std::vector<std::shared_ptr<Security>> securities;
    
    securities.push_back(std::make_shared<Bond>());
    securities.push_back(std::make_shared<Stock>());
    securities.push_back(std::make_shared<Bond>());
    securities.push_back(std::make_shared<Bond>());
    securities.push_back(std::make_shared<Stock>());
    securities.push_back(std::make_shared<Bond>());
    securities.push_back(std::make_shared<Stock>());
    securities.push_back(std::make_shared<Bond>());
    
    std::cout << securities.size() << std::endl;
    
    securities.erase(std::remove_if(securities.begin(), securities.end(), CheckerFunctor<IsStock>()), securities.end());
    
    std::cout << securities.size() << std::endl;
    
}


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