From da1be05d0e6fed21a14201dcea0dc2c71498bd74 Mon Sep 17 00:00:00 2001
From: Trond Norbye <tn202803@tor01>
Date: Fri, 6 Nov 2009 09:38:54 +0100
Subject: [PATCH] Protocol interface should be an enum and not a uint64_t for
 type safety

---
 example/interface_v0.c           |  4 ++--
 example/interface_v1.c           |  2 +-
 libmemcached/protocol/callback.h | 21 +++++++++++++++++----
 3 files changed, 20 insertions(+), 7 deletions(-)

diff --git a/example/interface_v0.c b/example/interface_v0.c
index 59631330..57459208 100644
--- a/example/interface_v0.c
+++ b/example/interface_v0.c
@@ -521,10 +521,10 @@ static protocol_binary_response_status stat_command_handler(const void *cookie,
 }
 
 memcached_binary_protocol_callback_st interface_v0_impl= {
-  .interface_version= 0,
+  .interface_version= MEMCACHED_PROTOCOL_HANDLER_V0,
 #ifdef FUTURE
   /*
-  ** There is a number of bugs in the extra options for gcc causing 
+  ** There is a number of bugs in the extra options for gcc causing
   ** warning on these struct initializers. It hurts my heart to remove
   ** it so I'll just leave it in here so that we can enable it when
   ** we can drop support for the broken compilers
diff --git a/example/interface_v1.c b/example/interface_v1.c
index 3de38542..f52abfa2 100644
--- a/example/interface_v1.c
+++ b/example/interface_v1.c
@@ -393,7 +393,7 @@ static protocol_binary_response_status version_handler(const void *cookie,
 }
 
 memcached_binary_protocol_callback_st interface_v1_impl= {
-  .interface_version= 1,
+  .interface_version= MEMCACHED_PROTOCOL_HANDLER_V1,
   .interface.v1= {
     .add= add_handler,
     .append= append_handler,
diff --git a/libmemcached/protocol/callback.h b/libmemcached/protocol/callback.h
index 826a317d..e7efaad7 100644
--- a/libmemcached/protocol/callback.h
+++ b/libmemcached/protocol/callback.h
@@ -338,15 +338,28 @@ typedef struct {
                                               memcached_binary_protocol_version_response_handler response_handler);
 } memcached_binary_protocol_callback_v1_st;
 
+
 /**
- *
+ * The version numbers for the different callback structures.
+ */
+typedef enum {
+   /** Version 0 is a lowlevel interface that tries to maximize your freedom */
+   MEMCACHED_PROTOCOL_HANDLER_V0= 0,
+   /**
+    * Version 1 abstracts more of the protocol details, and let you work at
+    * a logical level
+    */
+   MEMCACHED_PROTOCOL_HANDLER_V1= 1,
+} memcached_protocol_interface_version_t;
+
+/**
+ * Definition of the protocol callback structure.
  */
 typedef struct {
    /**
-    * The interface version used (set to 0 if you don't have any specialized
-    * command handlers).
+    * The interface version you provide callbacks for.
     */
-   uint64_t interface_version;
+   memcached_protocol_interface_version_t interface_version;
 
    /**
     * Callback fired just before the command will be executed.
-- 
2.30.2