From 18f29ded6a83875c27395d254c25e3d152ae1cc6 Mon Sep 17 00:00:00 2001
From: Martin Sustrik <sustrik@250bpm.com>
Date: Thu, 13 Jan 2011 11:44:23 +0100
Subject: Make cppcheck not complain about "'operator=' should return
 something"

Signed-off-by: Martin Sustrik <sustrik@250bpm.com>
---
 src/array.hpp             | 4 ++--
 src/atomic_counter.hpp    | 2 +-
 src/atomic_ptr.hpp        | 2 +-
 src/clock.hpp             | 2 +-
 src/connect_session.hpp   | 2 +-
 src/ctx.hpp               | 2 +-
 src/decoder.hpp           | 2 +-
 src/devpoll.hpp           | 2 +-
 src/encoder.hpp           | 2 +-
 src/epoll.hpp             | 2 +-
 src/fq.hpp                | 2 +-
 src/io_object.hpp         | 2 +-
 src/kqueue.hpp            | 2 +-
 src/lb.hpp                | 2 +-
 src/mailbox.hpp           | 2 +-
 src/mutex.hpp             | 2 +-
 src/named_session.hpp     | 2 +-
 src/object.hpp            | 2 +-
 src/own.hpp               | 2 +-
 src/pair.hpp              | 2 +-
 src/pgm_receiver.hpp      | 2 +-
 src/pgm_sender.hpp        | 2 +-
 src/pipe.hpp              | 4 ++--
 src/poll.hpp              | 2 +-
 src/poller_base.hpp       | 2 +-
 src/pub.hpp               | 2 +-
 src/pull.hpp              | 2 +-
 src/push.hpp              | 2 +-
 src/rep.hpp               | 2 +-
 src/req.hpp               | 2 +-
 src/select.hpp            | 2 +-
 src/semaphore.hpp         | 6 +++---
 src/session.hpp           | 2 +-
 src/socket_base.hpp       | 2 +-
 src/sub.hpp               | 2 +-
 src/swap.hpp              | 4 ++++
 src/tcp_connecter.hpp     | 2 +-
 src/tcp_listener.hpp      | 2 +-
 src/tcp_socket.hpp        | 2 +-
 src/thread.hpp            | 2 +-
 src/transient_session.hpp | 2 +-
 src/trie.hpp              | 2 +-
 src/xpub.hpp              | 2 +-
 src/xrep.hpp              | 2 +-
 src/xreq.hpp              | 2 +-
 src/xsub.hpp              | 2 +-
 src/ypipe.hpp             | 2 +-
 src/yqueue.hpp            | 2 +-
 src/zmq_connecter.hpp     | 2 +-
 src/zmq_engine.hpp        | 2 +-
 src/zmq_init.hpp          | 2 +-
 src/zmq_listener.hpp      | 2 +-
 52 files changed, 59 insertions(+), 55 deletions(-)

(limited to 'src')

diff --git a/src/array.hpp b/src/array.hpp
index 8d92f54..e3662da 100644
--- a/src/array.hpp
+++ b/src/array.hpp
@@ -59,7 +59,7 @@ namespace zmq
         int array_index;
 
         array_item_t (const array_item_t&);
-        void operator = (const array_item_t&);
+        const array_item_t &operator = (const array_item_t&);
     };
 
     //  Fast array implementation with O(1) access to item, insertion and
@@ -138,7 +138,7 @@ namespace zmq
         items_t items;
 
         array_t (const array_t&);
-        void operator = (const array_t&);
+        const array_t &operator = (const array_t&);
     };
 
 }
diff --git a/src/atomic_counter.hpp b/src/atomic_counter.hpp
index 61128fc..099b4b7 100644
--- a/src/atomic_counter.hpp
+++ b/src/atomic_counter.hpp
@@ -140,7 +140,7 @@ namespace zmq
 #endif
 
         atomic_counter_t (const atomic_counter_t&);
-        void operator = (const atomic_counter_t&);
+        const atomic_counter_t& operator = (const atomic_counter_t&);
     };
 
 }
diff --git a/src/atomic_ptr.hpp b/src/atomic_ptr.hpp
index f68e4b7..81e7cda 100644
--- a/src/atomic_ptr.hpp
+++ b/src/atomic_ptr.hpp
@@ -135,7 +135,7 @@ namespace zmq
 #endif
 
         atomic_ptr_t (const atomic_ptr_t&);
-        void operator = (const atomic_ptr_t&);
+        const atomic_ptr_t &operator = (const atomic_ptr_t&);
     };
 
 }
diff --git a/src/clock.hpp b/src/clock.hpp
index 2d473d5..bf895ec 100644
--- a/src/clock.hpp
+++ b/src/clock.hpp
@@ -51,7 +51,7 @@ namespace zmq
         uint64_t last_time;
 
         clock_t (const clock_t&);
-        void operator = (const clock_t&);
+        const clock_t &operator = (const clock_t&);
     };
 
 }
diff --git a/src/connect_session.hpp b/src/connect_session.hpp
index 746109d..c93b70c 100644
--- a/src/connect_session.hpp
+++ b/src/connect_session.hpp
@@ -56,7 +56,7 @@ namespace zmq
         std::string address;
 
         connect_session_t (const connect_session_t&);
-        void operator = (const connect_session_t&);
+        const connect_session_t &operator = (const connect_session_t&);
     };
 
 }
diff --git a/src/ctx.hpp b/src/ctx.hpp
index f35aa12..92684e6 100644
--- a/src/ctx.hpp
+++ b/src/ctx.hpp
@@ -143,7 +143,7 @@ namespace zmq
         mutex_t log_sync;
 
         ctx_t (const ctx_t&);
-        void operator = (const ctx_t&);
+        const ctx_t &operator = (const ctx_t&);
     };
     
 }
diff --git a/src/decoder.hpp b/src/decoder.hpp
index 2179105..9da6f72 100644
--- a/src/decoder.hpp
+++ b/src/decoder.hpp
@@ -167,7 +167,7 @@ namespace zmq
         unsigned char *buf;
 
         decoder_base_t (const decoder_base_t&);
-        void operator = (const decoder_base_t&);
+        const decoder_base_t &operator = (const decoder_base_t&);
     };
 
     //  Decoder for 0MQ framing protocol. Converts data batches into messages.
diff --git a/src/devpoll.hpp b/src/devpoll.hpp
index 58029b8..84ec222 100644
--- a/src/devpoll.hpp
+++ b/src/devpoll.hpp
@@ -88,7 +88,7 @@ namespace zmq
         thread_t worker;
 
         devpoll_t (const devpoll_t&);
-        void operator = (const devpoll_t&);
+        const devpoll_t &operator = (const devpoll_t&);
     };
 
 }
diff --git a/src/encoder.hpp b/src/encoder.hpp
index d135e2e..90517fe 100644
--- a/src/encoder.hpp
+++ b/src/encoder.hpp
@@ -175,7 +175,7 @@ namespace zmq
         unsigned char tmpbuf [10];
 
         encoder_t (const encoder_t&);
-        void operator = (const encoder_t&);
+        const encoder_t &operator = (const encoder_t&);
     };
 }
 
diff --git a/src/epoll.hpp b/src/epoll.hpp
index d4039e3..2188a9a 100644
--- a/src/epoll.hpp
+++ b/src/epoll.hpp
@@ -85,7 +85,7 @@ namespace zmq
         thread_t worker;
 
         epoll_t (const epoll_t&);
-        void operator = (const epoll_t&);
+        const epoll_t &operator = (const epoll_t&);
     };
 
 }
diff --git a/src/fq.hpp b/src/fq.hpp
index fa5c89d..3a8946e 100644
--- a/src/fq.hpp
+++ b/src/fq.hpp
@@ -71,7 +71,7 @@ namespace zmq
         bool terminating;
 
         fq_t (const fq_t&);
-        void operator = (const fq_t&);
+        const fq_t &operator = (const fq_t&);
     };
 
 }
diff --git a/src/io_object.hpp b/src/io_object.hpp
index 938e6ac..89745f3 100644
--- a/src/io_object.hpp
+++ b/src/io_object.hpp
@@ -69,7 +69,7 @@ namespace zmq
         poller_t *poller;
 
         io_object_t (const io_object_t&);
-        void operator = (const io_object_t&);
+        const io_object_t &operator = (const io_object_t&);
     };
 
 }
diff --git a/src/kqueue.hpp b/src/kqueue.hpp
index ad02882..83ff407 100644
--- a/src/kqueue.hpp
+++ b/src/kqueue.hpp
@@ -92,7 +92,7 @@ namespace zmq
         thread_t worker;
 
         kqueue_t (const kqueue_t&);
-        void operator = (const kqueue_t&);
+        const kqueue_t &operator = (const kqueue_t&);
     };
 
 }
diff --git a/src/lb.hpp b/src/lb.hpp
index 70b9a04..25e216d 100644
--- a/src/lb.hpp
+++ b/src/lb.hpp
@@ -67,7 +67,7 @@ namespace zmq
         bool terminating;
 
         lb_t (const lb_t&);
-        void operator = (const lb_t&);
+        const lb_t &operator = (const lb_t&);
     };
 
 }
diff --git a/src/mailbox.hpp b/src/mailbox.hpp
index dc49aad..630b488 100644
--- a/src/mailbox.hpp
+++ b/src/mailbox.hpp
@@ -53,7 +53,7 @@ namespace zmq
 
         //  Disable copying of mailbox_t object.
         mailbox_t (const mailbox_t&);
-        void operator = (const mailbox_t&);
+        const mailbox_t &operator = (const mailbox_t&);
     };
 
 }
diff --git a/src/mutex.hpp b/src/mutex.hpp
index 7e54096..2793f94 100644
--- a/src/mutex.hpp
+++ b/src/mutex.hpp
@@ -110,7 +110,7 @@ namespace zmq
  
         // Disable copy construction and assignment.
         mutex_t (const mutex_t&);
-        void operator = (const mutex_t&);
+        const mutex_t &operator = (const mutex_t&);
     };
  
 }
diff --git a/src/named_session.hpp b/src/named_session.hpp
index 428e108..101cdb2 100644
--- a/src/named_session.hpp
+++ b/src/named_session.hpp
@@ -48,7 +48,7 @@ namespace zmq
         blob_t name;
 
         named_session_t (const named_session_t&);
-        void operator = (const named_session_t&);
+        const named_session_t &operator = (const named_session_t&);
     };
 
 }
diff --git a/src/object.hpp b/src/object.hpp
index c81656e..0fd6f47 100644
--- a/src/object.hpp
+++ b/src/object.hpp
@@ -116,7 +116,7 @@ namespace zmq
         void send_command (command_t &cmd_);
 
         object_t (const object_t&);
-        void operator = (const object_t&);
+        const object_t &operator = (const object_t&);
     };
 
 }
diff --git a/src/own.hpp b/src/own.hpp
index 7090d62..cc55cd6 100644
--- a/src/own.hpp
+++ b/src/own.hpp
@@ -131,7 +131,7 @@ namespace zmq
         int term_acks;
 
         own_t (const own_t&);
-        void operator = (const own_t&);
+        const own_t &operator = (const own_t&);
     };
 
 }
diff --git a/src/pair.hpp b/src/pair.hpp
index c644675..863dcd5 100644
--- a/src/pair.hpp
+++ b/src/pair.hpp
@@ -67,7 +67,7 @@ namespace zmq
         bool terminating;
 
         pair_t (const pair_t&);
-        void operator = (const pair_t&);
+        const pair_t &operator = (const pair_t&);
     };
 
 }
diff --git a/src/pgm_receiver.hpp b/src/pgm_receiver.hpp
index 0ff4474..1c893ee 100644
--- a/src/pgm_receiver.hpp
+++ b/src/pgm_receiver.hpp
@@ -118,7 +118,7 @@ namespace zmq
         handle_t pipe_handle;
 
         pgm_receiver_t (const pgm_receiver_t&);
-        void operator = (const pgm_receiver_t&);
+        const pgm_receiver_t &operator = (const pgm_receiver_t&);
     };
 
 }
diff --git a/src/pgm_sender.hpp b/src/pgm_sender.hpp
index 2ba75be..5d3dd91 100644
--- a/src/pgm_sender.hpp
+++ b/src/pgm_sender.hpp
@@ -95,7 +95,7 @@ namespace zmq
         size_t write_size;
 
         pgm_sender_t (const pgm_sender_t&);
-        void operator = (const pgm_sender_t&);
+        const pgm_sender_t &operator = (const pgm_sender_t&);
     };
 
 }
diff --git a/src/pipe.hpp b/src/pipe.hpp
index a956ce3..4c94b40 100644
--- a/src/pipe.hpp
+++ b/src/pipe.hpp
@@ -113,7 +113,7 @@ namespace zmq
         bool terminating;
 
         reader_t (const reader_t&);
-        void operator = (const reader_t&);
+        const reader_t &operator = (const reader_t&);
     };
 
     struct i_writer_events
@@ -205,7 +205,7 @@ namespace zmq
         bool terminating;
 
         writer_t (const writer_t&);
-        void operator = (const writer_t&);
+        const writer_t &operator = (const writer_t&);
     };
 
 }
diff --git a/src/poll.hpp b/src/poll.hpp
index 83dc6ce..bc5fb5c 100644
--- a/src/poll.hpp
+++ b/src/poll.hpp
@@ -92,7 +92,7 @@ namespace zmq
         thread_t worker;
 
         poll_t (const poll_t&);
-        void operator = (const poll_t&);
+        const poll_t &operator = (const poll_t&);
     };
 
 }
diff --git a/src/poller_base.hpp b/src/poller_base.hpp
index b5fc1b6..0fd7997 100644
--- a/src/poller_base.hpp
+++ b/src/poller_base.hpp
@@ -75,7 +75,7 @@ namespace zmq
         atomic_counter_t load;
 
         poller_base_t (const poller_base_t&);
-        void operator = (const poller_base_t&);
+        const poller_base_t &operator = (const poller_base_t&);
     };
 
 }
diff --git a/src/pub.hpp b/src/pub.hpp
index f398526..61b623a 100644
--- a/src/pub.hpp
+++ b/src/pub.hpp
@@ -35,7 +35,7 @@ namespace zmq
     private:
 
         pub_t (const pub_t&);
-        void operator = (const pub_t&);
+        const pub_t &operator = (const pub_t&);
     };
 
 }
diff --git a/src/pull.hpp b/src/pull.hpp
index cd598d6..32b1c92 100644
--- a/src/pull.hpp
+++ b/src/pull.hpp
@@ -50,7 +50,7 @@ namespace zmq
         fq_t fq;
 
         pull_t (const pull_t&);
-        void operator = (const pull_t&);
+        const pull_t &operator = (const pull_t&);
 
     };
 
diff --git a/src/push.hpp b/src/push.hpp
index d01e1ff..fc541b8 100644
--- a/src/push.hpp
+++ b/src/push.hpp
@@ -50,7 +50,7 @@ namespace zmq
         lb_t lb;
 
         push_t (const push_t&);
-        void operator = (const push_t&);
+        const push_t &operator = (const push_t&);
     };
 
 }
diff --git a/src/rep.hpp b/src/rep.hpp
index 17e2686..6f44c6c 100644
--- a/src/rep.hpp
+++ b/src/rep.hpp
@@ -49,7 +49,7 @@ namespace zmq
         bool request_begins;
 
         rep_t (const rep_t&);
-        void operator = (const rep_t&);
+        const rep_t &operator = (const rep_t&);
 
     };
 
diff --git a/src/req.hpp b/src/req.hpp
index b9ea401..b012f9e 100644
--- a/src/req.hpp
+++ b/src/req.hpp
@@ -49,7 +49,7 @@ namespace zmq
         bool message_begins;
 
         req_t (const req_t&);
-        void operator = (const req_t&);
+        const req_t &operator = (const req_t&);
     };
 
 }
diff --git a/src/select.hpp b/src/select.hpp
index 916b87b..b3fae19 100644
--- a/src/select.hpp
+++ b/src/select.hpp
@@ -106,7 +106,7 @@ namespace zmq
         thread_t worker;
 
         select_t (const select_t&);
-        void operator = (const select_t&);
+        const select_t &operator = (const select_t&);
     };
 
 }
diff --git a/src/semaphore.hpp b/src/semaphore.hpp
index 8b16230..75e57e3 100644
--- a/src/semaphore.hpp
+++ b/src/semaphore.hpp
@@ -77,7 +77,7 @@ namespace zmq
         HANDLE ev;
 
         semaphore_t (const semaphore_t&);
-        void operator = (const semaphore_t&);
+        const semaphore_t &operator = (const semaphore_t&);
     };
 
 #elif defined ZMQ_HAVE_LINUX || defined ZMQ_HAVE_OSX || defined ZMQ_HAVE_OPENVMS
@@ -130,7 +130,7 @@ namespace zmq
         pthread_mutex_t mutex;
 
         semaphore_t (const semaphore_t&);
-        void operator = (const semaphore_t&);
+        const semaphore_t &operator = (const semaphore_t&);
     };
 
 #else
@@ -175,7 +175,7 @@ namespace zmq
         sem_t sem;
 
         semaphore_t (const semaphore_t&);
-        void operator = (const semaphore_t&);
+        const semaphore_t &operator = (const semaphore_t&);
     };
 
 #endif
diff --git a/src/session.hpp b/src/session.hpp
index acadab9..615e4bc 100644
--- a/src/session.hpp
+++ b/src/session.hpp
@@ -141,7 +141,7 @@ namespace zmq
         } state;
 
         session_t (const session_t&);
-        void operator = (const session_t&);
+        const session_t &operator = (const session_t&);
     };
 
 }
diff --git a/src/socket_base.hpp b/src/socket_base.hpp
index 6580b64..057f8b1 100644
--- a/src/socket_base.hpp
+++ b/src/socket_base.hpp
@@ -173,7 +173,7 @@ namespace zmq
         mutex_t sessions_sync;
 
         socket_base_t (const socket_base_t&);
-        void operator = (const socket_base_t&);
+        const socket_base_t &operator = (const socket_base_t&);
     };
 
 }
diff --git a/src/sub.hpp b/src/sub.hpp
index 6ed2c12..d8822f3 100644
--- a/src/sub.hpp
+++ b/src/sub.hpp
@@ -41,7 +41,7 @@ namespace zmq
     private:
 
         sub_t (const sub_t&);
-        void operator = (const sub_t&);
+        const sub_t &operator = (const sub_t&);
     };
 
 }
diff --git a/src/swap.hpp b/src/swap.hpp
index bc62fcd..503d35f 100644
--- a/src/swap.hpp
+++ b/src/swap.hpp
@@ -111,6 +111,10 @@ namespace zmq
         char *write_buf;
 
         int64_t write_buf_start_addr;
+
+        //  Disable copying of the swap object.
+        swap_t (const swap_t&);
+        const swap_t &operator = (const swap_t&);
     };
 
 }
diff --git a/src/tcp_connecter.hpp b/src/tcp_connecter.hpp
index ca4f6c3..e8bc1e9 100644
--- a/src/tcp_connecter.hpp
+++ b/src/tcp_connecter.hpp
@@ -72,7 +72,7 @@ namespace zmq
         fd_t s;
 
         tcp_connecter_t (const tcp_connecter_t&);
-        void operator = (const tcp_connecter_t&);
+        const tcp_connecter_t &operator = (const tcp_connecter_t&);
     };
 
 }
diff --git a/src/tcp_listener.hpp b/src/tcp_listener.hpp
index 0e21dba..5931502 100644
--- a/src/tcp_listener.hpp
+++ b/src/tcp_listener.hpp
@@ -64,7 +64,7 @@ namespace zmq
         fd_t s;
 
         tcp_listener_t (const tcp_listener_t&);
-        void operator = (const tcp_listener_t&);
+        const tcp_listener_t &operator = (const tcp_listener_t&);
     };
 
 }
diff --git a/src/tcp_socket.hpp b/src/tcp_socket.hpp
index e18474e..431e290 100644
--- a/src/tcp_socket.hpp
+++ b/src/tcp_socket.hpp
@@ -63,7 +63,7 @@ namespace zmq
 
         //  Disable copy construction of tcp_socket.
         tcp_socket_t (const tcp_socket_t&);
-        void operator = (const tcp_socket_t&);
+        const tcp_socket_t &operator = (const tcp_socket_t&);
     };
 
 }
diff --git a/src/thread.hpp b/src/thread.hpp
index 46745a5..27bea68 100644
--- a/src/thread.hpp
+++ b/src/thread.hpp
@@ -69,7 +69,7 @@ namespace zmq
 #endif
 
         thread_t (const thread_t&);
-        void operator = (const thread_t&);
+        const thread_t &operator = (const thread_t&);
     };
 
 }
diff --git a/src/transient_session.hpp b/src/transient_session.hpp
index 601f3d1..7571976 100644
--- a/src/transient_session.hpp
+++ b/src/transient_session.hpp
@@ -43,7 +43,7 @@ namespace zmq
         void detached ();
 
         transient_session_t (const transient_session_t&);
-        void operator = (const transient_session_t&);
+        const transient_session_t &operator = (const transient_session_t&);
     };
 
 }
diff --git a/src/trie.hpp b/src/trie.hpp
index 07f29fd..ea78562 100644
--- a/src/trie.hpp
+++ b/src/trie.hpp
@@ -49,7 +49,7 @@ namespace zmq
         } next;
 
         trie_t (const trie_t&);
-        void operator = (const trie_t&);
+        const trie_t &operator = (const trie_t&);
     };
 
 }
diff --git a/src/xpub.hpp b/src/xpub.hpp
index 13dd405..1a6fe76 100644
--- a/src/xpub.hpp
+++ b/src/xpub.hpp
@@ -65,7 +65,7 @@ namespace zmq
         bool terminating;
 
         xpub_t (const xpub_t&);
-        void operator = (const xpub_t&);
+        const xpub_t &operator = (const xpub_t&);
     };
 
 }
diff --git a/src/xrep.hpp b/src/xrep.hpp
index 8c2e683..0c7d696 100644
--- a/src/xrep.hpp
+++ b/src/xrep.hpp
@@ -106,7 +106,7 @@ namespace zmq
         bool terminating;
 
         xrep_t (const xrep_t&);
-        void operator = (const xrep_t&);
+        const xrep_t &operator = (const xrep_t&);
     };
 
 }
diff --git a/src/xreq.hpp b/src/xreq.hpp
index c515905..055c037 100644
--- a/src/xreq.hpp
+++ b/src/xreq.hpp
@@ -55,7 +55,7 @@ namespace zmq
         lb_t lb;
 
         xreq_t (const xreq_t&);
-        void operator = (const xreq_t&);
+        const xreq_t &operator = (const xreq_t&);
     };
 
 }
diff --git a/src/xsub.hpp b/src/xsub.hpp
index 5937ae1..85f902c 100644
--- a/src/xsub.hpp
+++ b/src/xsub.hpp
@@ -70,7 +70,7 @@ namespace zmq
         bool more;
 
         xsub_t (const xsub_t&);
-        void operator = (const xsub_t&);
+        const xsub_t &operator = (const xsub_t&);
     };
 
 }
diff --git a/src/ypipe.hpp b/src/ypipe.hpp
index a04cc4a..6865fa7 100644
--- a/src/ypipe.hpp
+++ b/src/ypipe.hpp
@@ -200,7 +200,7 @@ namespace zmq
 
         //  Disable copying of ypipe object.
         ypipe_t (const ypipe_t&);
-        void operator = (const ypipe_t&);
+        const ypipe_t &operator = (const ypipe_t&);
     };
 
 }
diff --git a/src/yqueue.hpp b/src/yqueue.hpp
index c05a0a7..1088906 100644
--- a/src/yqueue.hpp
+++ b/src/yqueue.hpp
@@ -189,7 +189,7 @@ namespace zmq
 
         //  Disable copying of yqueue.
         yqueue_t (const yqueue_t&);
-        void operator = (const yqueue_t&);
+        const yqueue_t &operator = (const yqueue_t&);
     };
 
 }
diff --git a/src/zmq_connecter.hpp b/src/zmq_connecter.hpp
index 0d3f41e..060f5c9 100644
--- a/src/zmq_connecter.hpp
+++ b/src/zmq_connecter.hpp
@@ -75,7 +75,7 @@ namespace zmq
         class session_t *session;
 
         zmq_connecter_t (const zmq_connecter_t&);
-        void operator = (const zmq_connecter_t&);
+        const zmq_connecter_t &operator = (const zmq_connecter_t&);
     };
 
 }
diff --git a/src/zmq_engine.hpp b/src/zmq_engine.hpp
index 65bb85b..42f45be 100644
--- a/src/zmq_engine.hpp
+++ b/src/zmq_engine.hpp
@@ -78,7 +78,7 @@ namespace zmq
         bool plugged;
 
         zmq_engine_t (const zmq_engine_t&);
-        void operator = (const zmq_engine_t&);
+        const zmq_engine_t &operator = (const zmq_engine_t&);
     };
 
 }
diff --git a/src/zmq_init.hpp b/src/zmq_init.hpp
index 12558a5..2ba46bb 100644
--- a/src/zmq_init.hpp
+++ b/src/zmq_init.hpp
@@ -84,7 +84,7 @@ namespace zmq
         class io_thread_t *io_thread;
 
         zmq_init_t (const zmq_init_t&);
-        void operator = (const zmq_init_t&);
+        const zmq_init_t &operator = (const zmq_init_t&);
     };
 
 }
diff --git a/src/zmq_listener.hpp b/src/zmq_listener.hpp
index 1975de7..4714a38 100644
--- a/src/zmq_listener.hpp
+++ b/src/zmq_listener.hpp
@@ -58,7 +58,7 @@ namespace zmq
         class socket_base_t *socket;
 
         zmq_listener_t (const zmq_listener_t&);
-        void operator = (const zmq_listener_t&);
+        const zmq_listener_t &operator = (const zmq_listener_t&);
     };
 
 }
-- 
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