From 43e44bc35b18c7e6938d8b5103ae8a76dd06f5a0 Mon Sep 17 00:00:00 2001
From: Felix Morgner <felix.morgner@gmail.com>
Date: Tue, 22 Sep 2026 16:27:21 +0200
Subject: lib/routers: introduce router concept

---
 ttwhy/routers/router_concepts.cppm | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)
 create mode 100644 ttwhy/routers/router_concepts.cppm

(limited to 'ttwhy/routers/router_concepts.cppm')

diff --git a/ttwhy/routers/router_concepts.cppm b/ttwhy/routers/router_concepts.cppm
new file mode 100644
index 0000000..ce143cb
--- /dev/null
+++ b/ttwhy/routers/router_concepts.cppm
@@ -0,0 +1,20 @@
+module;
+
+#include <asio.hpp>
+
+#include <concepts>
+
+export module ttwhy.routers:router_concepts;
+
+import ttwhy.scanners;
+
+namespace ttwhy
+{
+
+  export template<typename Candidate>
+  concept router = requires(Candidate candidate, scanners::input_event event) {
+    typename Candidate::terminal_policy;
+    { candidate.process(event) } -> std::same_as<asio::awaitable<void>>;
+  };
+
+}  // namespace ttwhy
-- 
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