Method Chaining

Here's a Person class that holds a persons name, age, and address. Create a series of setter functions that returns *this to enable method chaining. Demonstrate a method chain by setting a persons name, age, and address on the same line.

#include <iostream>
#include <string>

class Person {
private:
    std::string name;
    int age;
    std::string address;

public:
    // ADD SETTER FUNCTIONS HERE

    // Getter functions
    std::string getName() const {
        return name;
    }
    int getAge() const {
        return age;
    }
    std::string getAddress() const {
        return address;
    }

    // Method to print person details
    void printDetails() const {
        std::cout << "Name: " << name << ", Age: " << age << ", Address: " << address << std::endl;
    }
};

int main() {
    // Creating a Person object
    Person p;

    // Using method chaining to set properties
    p.setName("John Doe").setAge(30).setAddress("123 Main St");

    // Printing the Person's details to verify properties are set correctly
    p.printDetails();

    return 0;
}

Hint

Method Chaining is when multiple methods are called on the same object in a single statement. Each method returns a reference to the same object, allowing the next method to be called directly.

object.method1().method2().method3();

All of these methods are called in relation to object.

Answer

#include <iostream>
#include <string>

class Person {
private:
    std::string name;
    int age;
    std::string address;

public:
    // Setter functions returning a refference to itself.
    Person& setName(const std::string& n) {
        name = n;
        return *this;
    }

    Person& setAge(int a) {
        age = a;
        return *this;
    }

    Person& setAddress(const std::string& addr) {
        address = addr;
        return *this;
    }

    // Getter functions
    std::string getName() const {
        return name;
    }
    int getAge() const {
        return age;
    }
    std::string getAddress() const {
        return address;
    }

    // Method to print person details
    void printDetails() const {
        std::cout << "Name: " << name << ", Age: " << age << ", Address: " << address << std::endl;
    }
};

int main() {
    // Creating a Person object
    Person p;

    // Using method chaining to set properties
    p.setName("John Doe").setAge(30).setAddress("123 Main St");

    // Printing the Person's details to verify properties are set correctly
    p.printDetails();

    return 0;
}