Start work on new router

src/router.zig

@@ -0,0 +1,55 @@
+const std = @import("std");
+
+pub fn Router(comptime Context: type) type {
+    return struct {
+        const Self = @This();
+        const H = fn (Context) void;
+
+        handler: H,
+
+        pub fn dispatch(self: *const Self, ctx: Context) void {
+            self.handler(ctx);
+        }
+    };
+}
+
+test {
+    _ = _tests;
+}
+const _tests = struct {
+    fn CallTracker(comptime _uniq: anytype, comptime next: fn (Context) void) type {
+        _ = _uniq;
+        return struct {
+            var calls: u32 = 0;
+            fn func(ctx: Context) void {
+                calls += 1;
+                return next(ctx);
+            }
+
+            fn expectCalled(times: u32) !void {
+                return std.testing.expectEqual(times, calls);
+            }
+
+            fn reset() void {
+                calls = 0;
+            }
+        };
+    }
+
+    const Context = struct {};
+    fn dummyHandler(_: Context) void {}
+
+    test "Router(T).dispatch" {
+        const call_tracker = CallTracker(.{}, dummyHandler);
+
+        const router = Router(Context){ .handler = call_tracker.func };
+        router.dispatch(.{});
+        try call_tracker.expectCalled(1);
+
+        call_tracker.reset();
+        router.dispatch(.{});
+        router.dispatch(.{});
+        router.dispatch(.{});
+        try call_tracker.expectCalled(3);
+    }
+};