From b5939da59557f4a2e6e78fb42a5771afd0b1d774 Mon Sep 17 00:00:00 2001
From: Alex Hultman <alexhultman@gmail.com>
Date: Sat, 9 Feb 2019 23:39:52 +0100
Subject: [PATCH] Refuse to compile if alignment of user data cannot be
 satisfied

---
 src/App.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/App.h b/src/App.h
index afd82b4..dd7b40c 100644
--- a/src/App.h
+++ b/src/App.h
@@ -96,6 +96,10 @@ public:
 
     template <class UserData>
     TemplatedApp &&ws(std::string pattern, WebSocketBehavior &&behavior) {
+        /* Don't compile if alignment rules cannot be satisfied */
+        static_assert(alignof(UserData) <= LIBUS_EXT_ALIGNMENT,
+        "µWebSockets cannot satisfy UserData alignment requirements. You need to recompile µSockets with LIBUS_EXT_ALIGNMENT adjusted accordingly.");
+
         /* Every route has its own websocket context with its own behavior and user data type */
         auto *webSocketContext = WebSocketContext<SSL, true>::create(Loop::defaultLoop(), (us_new_socket_context_t *) httpContext);