/* * Simple code that uses the Builder pattern. * * For now, it just builds a few Person objects and prints their descriptions. */ #include #include using namespace std; enum Gender { MALE, FEMALE }; class Person { private: string name; int age; int heightInCm; Gender gender; protected: Person(string name, int age, int heightInCm, Gender gender) : name(name), age(age), heightInCm(heightInCm), gender(gender) {} public: class Builder { private: string name; int age; int heightInCm; Gender gender; public: Builder setName(string name) { this->name = name; return *this; } Builder setAge(int age) { this->age = age; return *this; } Builder setHeightInCm(int heightInCm) { this->heightInCm = heightInCm; return *this; } Builder setGender(Gender gender) { this->gender = gender; return *this; } Person build() { return Person(name, age, heightInCm, gender); } }; static Builder builder() { return Builder(); } void printDescription() { cout << "NAME : " << name << endl; cout << "AGE : " << age << " years old" << endl; cout << "GENDER : " << (gender == Gender::MALE ? "Male" : "Female") << endl; cout << "HEIGHT : " << heightInCm << " cm tall" << endl; } }; int main() { Person jack = Person::builder() .setName("Jack") .setAge(27) .setHeightInCm(180) .setGender(Gender::MALE) .build(); Person beth = Person::builder() .setName("Beth") .setAge(19) .setHeightInCm(159) .setGender(Gender::FEMALE) .build(); Person tom = Person::builder() .setName("Tom") .setAge(42) .setHeightInCm(173) .setGender(Gender::MALE) .build(); jack.printDescription(); cout << endl; beth.printDescription(); cout << endl; tom.printDescription(); return 0; }

C++ Builder pattern