#include <iostream>
#include <vector>

struct physical_t {

    int mass;
    int radius;
};

struct solarBody_t : physical_t {

    float atmosphereDrag;
    unsigned int atmosphereHeight;
};

struct ship_t : physical_t {

    float engine;
    unsigned int engineRadius;
};

union entity_t {

    physical_t physical;
    solarBody_t solarBody;
    ship_t ship;
};

vector <entity_t*> entity;

int main () {

    entity.push_back (new entity_t);
    entity[0]->mass = 43;
    entity[0]->engine = 16;
    std::cout << entity[0]->mass << endl << entity[0]->engine << endl;

    return 0;
};

/*this should output
43
16
*/