replace static_cast to dynamic_cast

simple.cpp

#include <iostream>
#include <vector>
#include <cstdlib>

struct test {
};

struct test_virt : public test {
    virtual void foo(){}
};

struct test_a : public test_virt {
    virtual void foo(){}
};

struct test_b : public test_virt {
    virtual void foo(){}
};

struct test_virt_virt : public virtual test_b, public virtual test_a {
    virtual void foo(){

    }
};

template<typename Res, typename Obj, bool is_class>
struct security_cast_impl {
    static Res security_cast(Obj o){
        return (Res)o;
    }
};

template<typename Res, typename Obj>
struct security_cast_impl<Res, Obj, true> {
    static Res security_cast(Obj* o){
        return dynamic_cast<Res>(o);
    }
};

template<typename Res, typename Obj>
Res security_cast(Obj o){
    return security_cast_impl<Res, Obj, std::is_class<Obj>::value>::security_cast(o);
}

#define static_cast security_cast

int main(){
    float test_float = 10;
    double test_double = static_cast<double>(test_float);
    std::cout << test_double <<std::endl;
    test_virt* t = new test_b();
    std::cout << (void*)static_cast<test_b*>(t) << std::endl;
    std::cout << (void*)static_cast<test_a*>(t) << std::endl;
    void* ttt = &test_double;
    std::cout << (void*)static_cast<test_a*>(ttt) << std::endl;
    return 0;
}