/* Defining a class, overriding the + opetarator and adding a method to the ostream class
to allow for the object to be printed out without specific conversion to a string via a method */

*/

#include <iostream>
using namespace std;

class Mtbs {
        public:
                Mtbs(float,const char *); Mtbs(int,const char *);
                Mtbs* addComponent(Mtbs*);
                float getFrequency();
                Mtbs operator+(Mtbs);
                void print(ostream *os);
        private:
                float value;
                const char *descriptor;
};

// Overload the << operator for streams like cout so they know what to do with
// at object of type Mtbs

ostream &operator<<(ostream &os, Mtbs &p);

// ABOVE HERE - Templates. Below here - code -----------------------------

Mtbs::Mtbs(int owoften,const char * wot) { value = (float)owoften; descriptor = wot; }
Mtbs::Mtbs(float owoften,const char * wot) { value = owoften; descriptor = wot; }
float Mtbs::getFrequency() { return value; }

void Mtbs::print(ostream *os)
        { *os << "Attention every " << value << " cups [" << descriptor << "]" ;
        }

ostream &operator<<(ostream &os, Mtbs &mt) {
        mt.print(&os);
        return os;
        }

Mtbs* Mtbs::addComponent(Mtbs *that) {
        float newvalue = 1.0 / ((1.0 / that->getFrequency()) + (1.0 / this->getFrequency()));
        return (new Mtbs(newvalue,"Combined operations"));
        }

Mtbs Mtbs::operator+(Mtbs that) {
        float newvalue = 1.0 / ((1.0 / that.getFrequency()) + (1.0 / this->getFrequency()));
        return Mtbs(newvalue,"In Combination");
        }

int main() {
        Mtbs *factors[4];
        factors[0] = new Mtbs(4,"Fill with Beans"); factors[1] = new Mtbs(6,"Fill with Water");
        factors[2] = new Mtbs(7,"Empty drip tray"); factors[3] = new Mtbs(9,"Empty grounds");

        { Mtbs *summer = factors[0];
                for (int i=1; i<4; i++) {
                        summer = summer->addComponent(factors[i]); }
                cout << summer->getFrequency() << endl;
        } /* This is a "scoping block" so the old "summer" is lost at this point */

        Mtbs *summer = factors[0];
        cout << "Starting with ... " << *factors[0] << endl;
        for (int i=1; i<4; i++) {
                cout << "Adding in ... " << *factors[i] << endl;
                *summer = *summer + *factors[i];
        }
        cout << "Overall ... " << *summer << endl;
}

/* Sample compile and run ...

WomanWithCat:harwell grahamellis$ make mtbsprint
c++ mtbsprint.cpp -o mtbsprint
WomanWithCat:harwell grahamellis$ ./mtbsprint
1.49112
Starting with ... Attention every 4 cups [Fill with Beans]
Adding in ... Attention every 6 cups [Fill with Water]
Adding in ... Attention every 7 cups [Empty drip tray]
Adding in ... Attention every 9 cups [Empty grounds]
Overall ... Attention every 1.49112 cups [Combinations]
WomanWithCat:harwell grahamellis$

*/