ridiculous-pseudo-polymorphism.cpp

#include <iostream>


#define STRONG_TYPEDEF(original, newtype)               \
        class newtype : public original                 \
        {                                               \
            using original::original;                   \
        };

using Age = unsigned int;
using Name = std::string;
using Country = std::string;

class Person
{
public:
    Person(Age age_, Name name_, Country country_)
    : age(age_)
    , name(name_)
    , country(country_) {}
    Age age;
    Name name;
    Country country;
};

STRONG_TYPEDEF(Person, Brazilian);
STRONG_TYPEDEF(Person, Lithuanian);

bool from_south_america(Person &p){
    return p.country == "Brazil";
}

bool from_sao_paulo(Brazilian &b) {
    return true;
}

int main() {
    Brazilian ricardo(30, "Ricardo", "Brazil");
    Lithuanian egle(24, "Egle", "Lithuania");

    std::cout << ricardo.name << " is" << (from_south_america(ricardo)? "": " not") << " South American" << std::endl;
    std::cout << egle.name << " is" << (from_south_america(egle)? "": " not") << " South American" << std::endl;

    std::cout << ricardo.name << " comes from " << (from_sao_paulo(ricardo)? "Sao Paulo" : "elsewhere") << std::endl;
    //std::cout << egle.name << " comes from " << (from_sao_paulo(egle)? "Sao Paulo" : "elsewhere") << std::endl;

    return 0;
}