adding static vs member demo

CMakeLists.txt

@@ -16,6 +16,11 @@ src/testCommandList.cpp
 target_include_directories("Info3_Praktikum-test" PUBLIC include/)
 
 
+add_executable("Class-Member-Variable-demo"
+src/class-member-variables.cpp
+)
+
+
 # Doxygen documentation
 find_package(Doxygen)
 if (DOXYGEN_FOUND)

src/class-member-variables.cpp

+#include <iostream>
+
+using std::cout;
+using std::string;
+
+class ControlDeveloper
+{
+private:
+    // class variable
+    // explicit "inline" to initialize in this translatin unit
+    inline static string CD_Class = "CLASS Control-Developer";
+    // member variable
+    const string CD_Member = "MEMBER Control-Developer";
+public:
+    // declare static to be called without object
+    static string getCDClass() { return CD_Class; }
+    // regular getter
+    string getCDMember() { return CD_Member; }
+};
+
+
+main()
+{
+    cout << "Demonstration of class vs. member variables:\n";
+    cout << "Without constructing an object we can call the static getter from the CD namespace:\n";
+    cout << "CD_Class:  " << ControlDeveloper::getCDClass() << '\n';
+    cout << "To be able to get the member variable we need to construct";
+    cout << " an object as the value will be specifically created for every object.\n";
+    ControlDeveloper cd = ControlDeveloper();
+    cout << "We can now call the non static getter:\n";
+    cout << "CD_Member: " << cd.getCDMember() << '\n';
+    cout << "We can now also use the object to call the static getter (with the same effect):\n";
+    cout << "CD_Class:  " << cd.getCDClass() << '\n';
+}
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