misc-farm

main.cpp

#include <iostream>
using namespace std;

class Animal {
public:
    virtual string noise() = 0;
    void speak() {
        cout << this->noise() << endl;
    }
};

template <class _> class Vehicle: public _ {
public:
    void go() {
        cout << "Brrrrm!" << endl;
    }
};

class Hitchable {
public:
    virtual void go() = 0;
    void pull_plough() {
        cout << "Hitching plough" << endl;
        this->go();
    }
};

class Tractor: public Vehicle<Hitchable> {
};

class Horse: public Animal, public Hitchable {
public:
    string noise() {
        return "Neigh!";
    }
    void go() {
        cout << "Clip-clop" << endl;
    }
};

int main() {
    Tractor t;
    t.pull_plough();
    Horse h;
    h.pull_plough();
}

Makefile

CXXFLAGS = -fmessage-length=0 -g3 -O0 -pedantic -std=c++11 -Wall -Wextra

all: main.cpp
	$(CXX) $(CXXFLAGS) -c -o main.o main.cpp
	$(CXX) -o ./farm main.o

help:
	@echo make CXX=clang++
	@echo '# or just `make` for g++'
	@echo ./farm
	@echo make clean

clean:
	rm -f *.o ./farm