lib/routers: introduce router concept

1 files changed, 20 insertions, 0 deletions

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