Add checks for derived socket type

1. Use a single instance of the vtable for each object. This saves some
memory at the expense of an extra pointer dereference per method
invocation.

2. Compare the class vtable pointer in sub-class methods to determine if
the object type is correct.

Signed-off-by: Michael Steinert <mike.steinert@gmail.com>

1 files changed, 7 insertions, 7 deletions

diff --git a/librabbitmq/amqp_socket.c b/librabbitmq/amqp_socket.c
index d7be798..4ce2093 100644
--- a/librabbitmq/amqp_socket.c
+++ b/librabbitmq/amqp_socket.c
@@ -52,32 +52,32 @@
 ssize_t
 amqp_socket_writev(amqp_socket_t *self, const struct iovec *iov, int iovcnt)
 {
-  return self->writev(self, iov, iovcnt);
+  return self->klass->writev(self, iov, iovcnt);
 }
 
 ssize_t
 amqp_socket_send(amqp_socket_t *self, const void *buf, size_t len, int flags)
 {
-  return self->send(self, buf, len, flags);
+  return self->klass->send(self, buf, len, flags);
 }
 
 ssize_t
 amqp_socket_recv(amqp_socket_t *self, void *buf, size_t len, int flags)
 {
-  return self->recv(self, buf, len, flags);
+  return self->klass->recv(self, buf, len, flags);
 }
 
 int
 amqp_socket_open(amqp_socket_t *self, const char *host, int port)
 {
-  return self->open(self, host, port);
+  return self->klass->open(self, host, port);
 }
 
 int
 amqp_socket_close(amqp_socket_t *self)
 {
   if (self) {
-    return self->close(self);
+    return self->klass->close(self);
   }
   return 0;
 }
@@ -85,13 +85,13 @@ amqp_socket_close(amqp_socket_t *self)
 int
 amqp_socket_error(amqp_socket_t *self)
 {
-  return self->error(self);
+  return self->klass->error(self);
 }
 
 int
 amqp_socket_get_sockfd(amqp_socket_t *self)
 {
-  return self->get_sockfd(self);
+  return self->klass->get_sockfd(self);
 }
 
 int amqp_open_socket(char const *hostname,