Adapt CROW_WEBSOCKET_ROUTE to accept app reference

include/crow/app.h

@@ -30,7 +30,7 @@
 #else
 #define CROW_ROUTE(app, url) app.template route<crow::black_magic::get_parameter_tag(url)>(url)
 #define CROW_BP_ROUTE(blueprint, url) blueprint.new_rule_tagged<crow::black_magic::get_parameter_tag(url)>(url)
-#define CROW_WEBSOCKET_ROUTE(app, url) app.route<crow::black_magic::get_parameter_tag(url)>(url).websocket<decltype(app)>(&app)
+#define CROW_WEBSOCKET_ROUTE(app, url) app.route<crow::black_magic::get_parameter_tag(url)>(url).websocket<std::remove_reference<decltype(app)>::type>(&app)
 #define CROW_MIDDLEWARES(app, ...) template middlewares<typename std::remove_reference<decltype(app)>::type, __VA_ARGS__>()
 #endif
 #define CROW_CATCHALL_ROUTE(app) app.catchall_route()

tests/CMakeLists.txt

@@ -18,6 +18,7 @@ endif()
 
 add_subdirectory(template)
 add_subdirectory(multi_file)
+add_subdirectory(external_definition)
 if ("ssl" IN_LIST CROW_FEATURES)
 	add_subdirectory(ssl)
 endif()

tests/external_definition/CMakeLists.txt

@@ -0,0 +1,16 @@
+project(test_external_definition)
+
+add_executable(
+  ${PROJECT_NAME}
+  main.cpp
+)
+
+target_include_directories(
+  ${PROJECT_NAME}
+  PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}
+)
+
+target_link_libraries(
+  ${PROJECT_NAME}
+  PUBLIC Crow::Crow
+)

tests/external_definition/main.cpp

@@ -0,0 +1,23 @@
+// Testing whether crow routes can be defined in an external function.
+#include "crow.h"
+
+void define_endpoints(crow::SimpleApp& app) {
+    CROW_ROUTE(app, "/") ([]() {
+        return "Hello, world!";
+    });
+    CROW_WEBSOCKET_ROUTE(app, "/ws")
+      .onaccept([&](const crow::request&, void**) {
+          return true;
+      })
+      .onopen([](crow::websocket::connection&) {})
+      .onclose([](crow::websocket::connection&, std::string_view) {});
+}
+
+int main()
+{
+    crow::SimpleApp app;
+
+    define_endpoints(app);
+
+    app.port(18080).run();
+}