Add static network

include/kpn/tmp/repeat_tuple.hpp

@@ -0,0 +1,23 @@
+#pragma once
+#include <cstddef>
+#include <tuple>
+#include <utility>
+
+namespace kpn::tmp {
+
+// repeat_tuple_t<T, N> — std::tuple<T, T, ..., T> with N elements.
+// Used by FanoutNode and fanout_groups to express N homogeneous outputs.
+
+template<typename T, std::size_t N, typename Seq = std::make_index_sequence<N>>
+struct repeat_tuple;
+
+template<typename T, std::size_t N, std::size_t... Is>
+struct repeat_tuple<T, N, std::index_sequence<Is...>> {
+    template<std::size_t> using always_T = T;
+    using type = std::tuple<always_T<Is>...>;
+};
+
+template<typename T, std::size_t N>
+using repeat_tuple_t = typename repeat_tuple<T, N>::type;
+
+} // namespace kpn::tmp