more lessons

cpp/inheritance/README.md

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+# Inheritance
+
+c++ also allows to inherit from multiple base classes at once, but that is a
+little to complicated for this lesson.
+
+Relevant files:
+
+- [main.cpp](./index.cpp)
+
+- [animal.h](./animal.h)
+- [animal.cpp](./animal.cpp)
+
+- [cat.h](./cat.h)
+- [cat.cpp](./cat.cpp)
+
+- [dog.h](./dog.h)
+- [dog.cpp](./dog.cpp)

cpp/inheritance/animal.cpp

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+#include "animal.h"
+#include <iostream>
+#include <string>
+
+animal::animal(std::string name) {
+  this->name = name;
+}
+
+void animal::make_sound() {
+  cout << name << ":" << endl;
+}

cpp/inheritance/animal.h

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+#pragma once
+
+#include <string>
+using namespace std;
+
+class animal
+{
+  public:
+    std::string name;
+    virtual void make_sound();
+    animal(std::string name);
+};

cpp/inheritance/cat.cpp

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+#include "cat.h"
+
+#include <iostream>
+#include <string>
+
+void cat::make_sound() {
+  animal::make_sound();
+  cout << "meow" << endl;
+}

cpp/inheritance/cat.h

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+#pragma once
+
+#include <string>
+#include "animal.h"
+using namespace std;
+
+class cat: public animal
+{
+  using animal::animal;
+  public:
+    void make_sound() override;
+};

cpp/inheritance/dog.cpp

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+#include "dog.h"
+
+#include <iostream>
+#include <string>
+
+void dog::make_sound() {
+  cout << "doggo " << name << " says:" << endl;
+  cout << "woof!" << endl;
+}

cpp/inheritance/dog.h

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+#pragma once
+
+#include <string>
+#include "animal.h"
+using namespace std;
+
+class dog: public animal
+{
+  using animal::animal;
+  public:
+    void make_sound() override;
+};

cpp/inheritance/main.cpp

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+#include "cat.h"
+#include "dog.h"
+
+#include <string>
+
+int main() {
+  dog d("buster");
+  cat c("mittens");
+
+  d.make_sound();
+  c.make_sound();
+}