diff --git a/cpp/4 kyu - Tuple sum.cpp b/cpp/4 kyu - Tuple sum.cpp
new file mode 100644
index 0000000..f0e0b59
--- /dev/null
+++ b/cpp/4 kyu - Tuple sum.cpp	
@@ -0,0 +1,33 @@
+#include <tuple>
+
+static double r;
+
+void f(int x)
+{
+  r += x;
+}
+
+void f(double x)
+{
+  r += x;
+}
+
+template <typename T>
+void f(T t)
+{
+  (void) t;
+}
+
+template <typename... Ts>
+void g(Ts... ts)
+{
+  (f(ts), ...);
+}
+
+template <typename... Ts> 
+double tuple_sum(const std::tuple<Ts...>& tpl)
+{
+  r = 0;
+  std::apply(g<Ts...>, tpl);
+  return r;
+}