restructure and add ipi texs

ws2019/ipi/uebungen/cpp_headers/Funktor.cc

@@ -0,0 +1,34 @@
+#include <iostream>
+
+class Function {
+public:
+  virtual ~Function () {};
+  virtual int operator() (int) = 0;
+};
+
+class Inkrementierer : public Function {
+public:
+  Inkrementierer (int n) {inkrement = n;}
+  int operator() (int n) {return n+inkrement;}
+private:
+  int inkrement;
+};
+
+void schleife (Function& func) {
+  for (int i=1; i<10; i++)
+    std::cout << func(i) << " ";
+  std::cout << std::endl;
+}
+
+class Quadrat : public Function {
+public:
+  int operator() (int n) {return n*n;}
+} ;
+
+int main () {
+  Inkrementierer ink(10);
+  Quadrat quadrat;
+  schleife (ink);
+  schleife (quadrat);
+}
+