diff --git a/printtest.cpp b/printtest.cpp
new file mode 100644
index 0000000..117eca4
--- /dev/null
+++ b/printtest.cpp
@@ -0,0 +1,50 @@
+#include <iostream>
+
+struct Class
+{
+   int a = 300;
+};
+
+std::ostream &operator << (std::ostream &out, Class c)
+{
+   out << c.a;
+   return out;
+}
+
+int Print(char const *fmt)
+{
+   int ret = 0;
+
+   for(auto p = fmt; *p; p++, ret++)
+      std::cout.put(*p);
+
+   std::cout.put('\n');
+
+   return ret;
+}
+
+template<typename T, typename... Args>
+int Print(char const *fmt, T &&head, Args &&...tail)
+{
+   int ret = 0;
+
+   for(auto p = fmt; *p; p++, ret++)
+   {
+      if(p[0] == '{')
+         switch(p[1])
+         {
+         case '}': std::cout << head; return ret + Print(p + 2, tail...);
+         case '{': p++; break;
+         }
+
+      std::cout.put(*p);
+   }
+
+   return -1; // won't happen
+}
+
+int main()
+{
+   Class c;
+   Print("a{}b{{}c{d{}e{}f", 91230, c);
+}
diff --git a/virtoper.cpp b/virtoper.cpp
new file mode 100644
index 0000000..cce0a92
--- /dev/null
+++ b/virtoper.cpp
@@ -0,0 +1,27 @@
+#include <iostream>
+
+class A
+{
+public:
+   virtual int operator + (int rhs) {return rhs;}
+};
+
+class B : public A
+{
+public:
+   int operator + (int) override {return 999;}
+};
+
+void print(A &a)
+{
+   std::cout << a + 5 << std::endl;
+}
+
+int main()
+{
+   A a;
+   B b;
+
+   print(a);
+   print(b);
+}