gistfile1.cpp

class Course : public Model {

[...]

public:
	Field<std::string> name;
	Field<long> weeks;

public:
	Relation<Course, HasOne, Professor> professor;

};

int main() {
	Course course;

	course.where(course.professor->name == "Carvalho" && (course.weeks == 2 || course.weeks == 3));

	return 0;
}

/*
SELECT * FROM `Course` WHERE (`Professor.name` = 'Carvalho') AND ((`Course.weeks` = 2) OR (`Course.weeks` = 3)) LEFT JOIN Professor ON `Course.Professor_id` = `Professor.id`
*/