#include <iostream>
#include <vector>

struct Component
{
    enum types { a, b };
    // Common data such as id
};

struct Component_a : public Component
{
    float f1;
    float f2;
    float f3;

    Component_a(float f1, float f2, float f3)
    {
        this->f1 = f1;
        this->f2 = f2;
        this->f3 = f3;
    }

    void print()
    {
        std::cout << "f1: " << f1 << ", f2: " << f2 << ", f3: " << f3 << std::endl;
    }
};

struct Component_b : public Component
{
    int i;

    Component_b(int i)
    {
        this->i = i;
    }

    void print()
    {
        std::cout << "i: " << i << std::endl;
    }
};

struct ComponentUnion {
    union {
        Component_a a;
        Component_b b;
    };

    Component::types type;

    ComponentUnion(Component_a a)
    {
        this->a = a;
        this->type = Component::types::a;
    }

    ComponentUnion(Component_b b)
    {
        this->b = b;
        this->type = Component::types::b;
    }

};

int main()
{
    std::vector<ComponentUnion> v;
    v.push_back(ComponentUnion( Component_a(0.1f, 0.2f, 0.3f) ));
    v.push_back(ComponentUnion( Component_b(1) ));

    for (ComponentUnion& element : v)
    {
        switch (element.type)
        {
        case Component::types::a:
            // Interpret as type Blueprinta
            element.a.print();
            break;
        case Component::types::b:
            // Interpret as type Blueprintb
            element.b.print();
            break;
        }
    }

    system("PAUSE");
}

/*
Output:
f1: 0.1, f2: 0.2, f3: 0.3
i: 1
*/