Add demo file

Author: Stelllarce

Practicum/Week 11/Examples/Demo/inheritance.cpp

@@ -0,0 +1,67 @@
+// source: https://leimao.github.io/blog/CPP-Virtual-Table/
+class Drug
+{
+public:
+    Drug(int property) : m_property{property} {};
+    virtual ~Drug() = default;
+    virtual void foo() = 0;
+    virtual void baz() = 0;
+    int m_property;
+};
+
+class Fruit
+{
+public:
+    Fruit(double size, int id, char country)
+        : m_size{size}, m_id{id}, m_country{country} {};
+    virtual ~Fruit() = default;
+    virtual void foo() = 0;
+    virtual void bar(){};
+    double m_size;
+    int m_id;
+    char m_country;
+};
+
+class Apple : public Fruit
+{
+public:
+    Apple(double size, int id, char country, int color)
+        : Fruit{size, id, country}, m_color{color} {};
+    ~Apple() = default;
+    void foo() override {}
+    void get_color() const {}
+    virtual void apple_foo() {}
+    int m_color;
+};
+
+class Orange : public Fruit, public Drug
+{
+public:
+    Orange(double size, int id, char country, double weight)
+        : Fruit{size, id, country}, Drug{4}, m_weight{weight} {};
+    ~Orange() = default;
+    // Overriding Fruit virtual functions.
+    void foo() override {}
+    void bar() override {}
+    // Overriding Drug virtual functions.
+    void baz() override {}
+    // Orange non-virtual functions.
+    void get_weight() const {}
+    // Orange virtual functions.
+    virtual void orange_bar() {}
+    double m_weight;
+};
+
+int main()
+{
+    double const apple_size{1.0};
+    int const apple_id{1};
+    char const apple_country{'c'};
+    int const apple_color{2};
+    double const orange_size{0.8};
+    int const orange_id{2};
+    char const orange_country{'n'};
+    double const orange_weight{0.6};
+    Apple apple{apple_size, apple_id, apple_country, apple_color};
+    Orange orange{orange_size, orange_id, orange_country, orange_weight};
+}