Merge pull request #3145 from sigiesec/analyze

More code style fixes and improvements to static analysis configuration

.clang-tidy

@@ -9,6 +9,7 @@ Checks:        "*,\
 -fuchsia-default-arguments,\
 -google-readability-todo,\
 -cppcoreguidelines-pro-type-member-init,\
+-cppcoreguidelines-pro-type-static-cast-downcast,\
 # not currently a coding convention, C++11-specific, but conceivable,\
 -modernize-use-nullptr,\
 -modernize-use-equals-default,\
@@ -27,6 +28,7 @@ Checks:        "*,\
 # not easily possible to implement (maybe replace by specific exclusions),\
 -cppcoreguidelines-pro-type-vararg,\
 -cppcoreguidelines-pro-type-reinterpret-cast,\
+-hicpp-signed-bitwise,\
 # duplicates,\
 -google-readability-braces-around-statements,\
 -cppcoreguidelines-pro-type-cstyle-cast,\
@@ -38,7 +40,7 @@ Checks:        "*,\
 -hicpp-use-auto,\
 -hicpp-use-nullptr,\
 -hicpp-no-array-decay,\
--hicpp-member-init"
+-hicpp-member-init“
 WarningsAsErrors: ''
 HeaderFilterRegex: ''
 # AnalyzeTemporaryDtors: false

CMakeLists.txt

@@ -415,6 +415,7 @@ if (CMAKE_SYSTEM_NAME MATCHES "SunOS" OR CMAKE_SYSTEM_NAME MATCHES "NetBSD")
   endif ()
 endif ()
 
+zmq_check_noexcept ()
 
 #-----------------------------------------------------------------------------
 if (NOT CMAKE_CROSSCOMPILING AND NOT MSVC)

builds/cmake/Modules/ZMQSourceRunChecks.cmake

@@ -293,3 +293,21 @@ int main (int argc, char *argv [])
 "
     ZMQ_HAVE_GETRANDOM)
 endmacro()
+
+macro(zmq_check_noexcept)
+  message(STATUS "Checking whether noexcept is supported")
+  check_cxx_source_compiles(
+"
+struct X 
+{
+    X(int i) noexcept {}
+};
+
+int main(int argc, char *argv [])
+{
+    X x(5);
+    return 0;
+}
+"
+    ZMQ_HAVE_NOEXCEPT)
+endmacro()

builds/cmake/platform.hpp.in

@@ -19,6 +19,8 @@
 #cmakedefine HAVE_MKDTEMP
 #cmakedefine ZMQ_HAVE_UIO
 
+#cmakedefine ZMQ_HAVE_NOEXCEPT
+
 #cmakedefine ZMQ_HAVE_EVENTFD
 #cmakedefine ZMQ_HAVE_EVENTFD_CLOEXEC
 #cmakedefine ZMQ_HAVE_IFADDRS

src/address.cpp

@@ -51,73 +51,52 @@ zmq::address_t::address_t (const std::string &protocol_,
     address (address_),
     parent (parent_)
 {
-    memset (&resolved, 0, sizeof resolved);
+    resolved.dummy = NULL;
 }
 
 zmq::address_t::~address_t ()
 {
-    if (protocol == "tcp") {
+    if (protocol == protocol_name::tcp) {
-        if (resolved.tcp_addr) {
+        LIBZMQ_DELETE (resolved.tcp_addr);
-            LIBZMQ_DELETE (resolved.tcp_addr);
+    } else if (protocol == protocol_name::udp) {
-        }
+        LIBZMQ_DELETE (resolved.udp_addr);
-    }
-    if (protocol == "udp") {
-        if (resolved.udp_addr) {
-            LIBZMQ_DELETE (resolved.udp_addr);
-        }
     }
 #if !defined ZMQ_HAVE_WINDOWS && !defined ZMQ_HAVE_OPENVMS                     \
   && !defined ZMQ_HAVE_VXWORKS
-    else if (protocol == "ipc") {
+    else if (protocol == protocol_name::ipc) {
-        if (resolved.ipc_addr) {
+        LIBZMQ_DELETE (resolved.ipc_addr);
-            LIBZMQ_DELETE (resolved.ipc_addr);
-        }
     }
 #endif
 #if defined ZMQ_HAVE_TIPC
-    else if (protocol == "tipc") {
+    else if (protocol == protocol_name::tipc) {
-        if (resolved.tipc_addr) {
+        LIBZMQ_DELETE (resolved.tipc_addr);
-            LIBZMQ_DELETE (resolved.tipc_addr);
-        }
     }
 #endif
 #if defined ZMQ_HAVE_VMCI
-    else if (protocol == "vmci") {
+    else if (protocol == protocol_name::vmci) {
-        if (resolved.vmci_addr) {
+        LIBZMQ_DELETE (resolved.vmci_addr);
-            LIBZMQ_DELETE (resolved.vmci_addr);
-        }
     }
 #endif
 }
 
 int zmq::address_t::to_string (std::string &addr_) const
 {
-    if (protocol == "tcp") {
+    if (protocol == protocol_name::tcp && resolved.tcp_addr)
-        if (resolved.tcp_addr)
+        return resolved.tcp_addr->to_string (addr_);
-            return resolved.tcp_addr->to_string (addr_);
+    if (protocol == protocol_name::udp && resolved.udp_addr)
-    }
+        return resolved.udp_addr->to_string (addr_);
-    if (protocol == "udp") {
-        if (resolved.udp_addr)
-            return resolved.udp_addr->to_string (addr_);
-    }
 #if !defined ZMQ_HAVE_WINDOWS && !defined ZMQ_HAVE_OPENVMS                     \
   && !defined ZMQ_HAVE_VXWORKS
-    else if (protocol == "ipc") {
+    if (protocol == protocol_name::ipc && resolved.ipc_addr)
-        if (resolved.ipc_addr)
+        return resolved.ipc_addr->to_string (addr_);
-            return resolved.ipc_addr->to_string (addr_);
-    }
 #endif
 #if defined ZMQ_HAVE_TIPC
-    else if (protocol == "tipc") {
+    if (protocol == protocol_name::tipc && resolved.tipc_addr)
-        if (resolved.tipc_addr)
+        return resolved.tipc_addr->to_string (addr_);
-            return resolved.tipc_addr->to_string (addr_);
-    }
 #endif
 #if defined ZMQ_HAVE_VMCI
-    else if (protocol == "vmci") {
+    if (protocol == protocol_name::vmci && resolved.vmci_addr)
-        if (resolved.vmci_addr)
+        return resolved.vmci_addr->to_string (addr_);
-            return resolved.vmci_addr->to_string (addr_);
-    }
 #endif
 
     if (!protocol.empty () && !address.empty ()) {

src/address.hpp

@@ -46,6 +46,23 @@ class tipc_address_t;
 #if defined ZMQ_HAVE_VMCI
 class vmci_address_t;
 #endif
+
+namespace protocol_name
+{
+static const char tcp[] = "tcp";
+static const char udp[] = "udp";
+#if !defined ZMQ_HAVE_WINDOWS && !defined ZMQ_HAVE_OPENVMS                     \
+  && !defined ZMQ_HAVE_VXWORKS
+static const char ipc[] = "ipc";
+#endif
+#if defined ZMQ_HAVE_TIPC
+static const char tipc[] = "tipc";
+#endif
+#if defined ZMQ_HAVE_VMCI
+static const char vmci[] = "vmci";
+#endif
+}
+
 struct address_t
 {
     address_t (const std::string &protocol_,
@@ -59,8 +76,10 @@ struct address_t
     ctx_t *const parent;
 
     //  Protocol specific resolved address
+    //  All members must be pointers to allow for consistent initialization
     union
     {
+        void *dummy;
         tcp_address_t *tcp_addr;
         udp_address_t *udp_addr;
 #if !defined ZMQ_HAVE_WINDOWS && !defined ZMQ_HAVE_OPENVMS                     \

src/atomic_counter.hpp

@@ -66,6 +66,14 @@
 #include <arch/atomic.h>
 #endif
 
+#if !defined ZMQ_NOEXCEPT
+#if defined ZMQ_HAVE_NOEXCEPT
+#define ZMQ_NOEXCEPT noexcept
+#else
+#define ZMQ_NOEXCEPT
+#endif
+#endif
+
 namespace zmq
 {
 //  This class represents an integer that can be incremented/decremented
@@ -90,15 +98,16 @@ class atomic_counter_t
   public:
     typedef uint32_t integer_t;
 
-    inline atomic_counter_t (integer_t value_ = 0) : _value (value_) {}
+    inline atomic_counter_t (integer_t value_ = 0) ZMQ_NOEXCEPT
-
+        : _value (value_)
-    inline ~atomic_counter_t () {}
+    {
+    }
 
     //  Set counter _value (not thread-safe).
-    inline void set (integer_t value_) { _value = value_; }
+    inline void set (integer_t value_) ZMQ_NOEXCEPT { _value = value_; }
 
     //  Atomic addition. Returns the old _value.
-    inline integer_t add (integer_t increment_)
+    inline integer_t add (integer_t increment_) ZMQ_NOEXCEPT
     {
         integer_t old_value;
 
@@ -143,7 +152,7 @@ class atomic_counter_t
     }
 
     //  Atomic subtraction. Returns false if the counter drops to zero.
-    inline bool sub (integer_t decrement_)
+    inline bool sub (integer_t decrement_) ZMQ_NOEXCEPT
     {
 #if defined ZMQ_ATOMIC_COUNTER_WINDOWS
         LONG delta = -((LONG) decrement_);
@@ -198,7 +207,7 @@ class atomic_counter_t
 #endif
     }
 
-    inline integer_t get () const { return _value; }
+    inline integer_t get () const ZMQ_NOEXCEPT { return _value; }
 
   private:
 #if defined ZMQ_ATOMIC_COUNTER_CXX11

src/atomic_ptr.hpp

@@ -64,6 +64,14 @@
 #include <arch/atomic.h>
 #endif
 
+#if !defined ZMQ_NOEXCEPT
+#if defined ZMQ_HAVE_NOEXCEPT
+#define ZMQ_NOEXCEPT noexcept
+#else
+#define ZMQ_NOEXCEPT
+#endif
+#endif
+
 namespace zmq
 {
 #if !defined ZMQ_ATOMIC_PTR_CXX11
@@ -73,7 +81,7 @@ inline void *atomic_xchg_ptr (void **ptr_,
                               ,
                               mutex_t &_sync
 #endif
-)
+                              ) ZMQ_NOEXCEPT
 {
 #if defined ZMQ_ATOMIC_PTR_WINDOWS
     return InterlockedExchangePointer ((PVOID *) ptr_, val_);
@@ -120,7 +128,7 @@ inline void *atomic_cas (void *volatile *ptr_,
                          ,
                          mutex_t &_sync
 #endif
-)
+                         ) ZMQ_NOEXCEPT
 {
 #if defined ZMQ_ATOMIC_PTR_WINDOWS
     return InterlockedCompareExchangePointer ((volatile PVOID *) ptr_, val_,
@@ -176,19 +184,16 @@ template <typename T> class atomic_ptr_t
 {
   public:
     //  Initialise atomic pointer
-    inline atomic_ptr_t () { _ptr = NULL; }
+    inline atomic_ptr_t () ZMQ_NOEXCEPT { _ptr = NULL; }
-
-    //  Destroy atomic pointer
-    inline ~atomic_ptr_t () {}
 
     //  Set value of atomic pointer in a non-threadsafe way
     //  Use this function only when you are sure that at most one
     //  thread is accessing the pointer at the moment.
-    inline void set (T *ptr_) { _ptr = ptr_; }
+    inline void set (T *ptr_) ZMQ_NOEXCEPT { _ptr = ptr_; }
 
     //  Perform atomic 'exchange pointers' operation. Pointer is set
     //  to the 'val_' value. Old value is returned.
-    inline T *xchg (T *val_)
+    inline T *xchg (T *val_) ZMQ_NOEXCEPT
     {
 #if defined ZMQ_ATOMIC_PTR_CXX11
         return _ptr.exchange (val_, std::memory_order_acq_rel);
@@ -206,7 +211,7 @@ template <typename T> class atomic_ptr_t
     //  The pointer is compared to 'cmp' argument and if they are
     //  equal, its value is set to 'val_'. Old value of the pointer
     //  is returned.
-    inline T *cas (T *cmp_, T *val_)
+    inline T *cas (T *cmp_, T *val_) ZMQ_NOEXCEPT
     {
 #if defined ZMQ_ATOMIC_PTR_CXX11
         _ptr.compare_exchange_strong (cmp_, val_, std::memory_order_acq_rel);
@@ -240,11 +245,14 @@ template <typename T> class atomic_ptr_t
 
 struct atomic_value_t
 {
-    atomic_value_t (const int value_) : _value (value_) {}
+    atomic_value_t (const int value_) ZMQ_NOEXCEPT : _value (value_) {}
 
-    atomic_value_t (const atomic_value_t &src_) : _value (src_.load ()) {}
+    atomic_value_t (const atomic_value_t &src_) ZMQ_NOEXCEPT
+        : _value (src_.load ())
+    {
+    }
 
-    void store (const int value_)
+    void store (const int value_) ZMQ_NOEXCEPT
     {
 #if defined ZMQ_ATOMIC_PTR_CXX11
         _value.store (value_, std::memory_order_release);
@@ -258,7 +266,7 @@ struct atomic_value_t
 #endif
     }
 
-    int load () const
+    int load () const ZMQ_NOEXCEPT
     {
 #if defined ZMQ_ATOMIC_PTR_CXX11
         return _value.load (std::memory_order_acquire);

src/encoder.hpp

@@ -54,14 +54,14 @@ namespace zmq
 template <typename T> class encoder_base_t : public i_encoder
 {
   public:
-    inline encoder_base_t (size_t bufsize_) :
+    inline explicit encoder_base_t (size_t bufsize_) :
         _write_pos (0),
         _to_write (0),
         _next (NULL),
         _new_msg_flag (false),
         _buf_size (bufsize_),
         _buf (static_cast<unsigned char *> (malloc (bufsize_))),
-        in_progress (NULL)
+        _in_progress (NULL)
     {
         alloc_assert (_buf);
     }
@@ -78,7 +78,7 @@ template <typename T> class encoder_base_t : public i_encoder
         unsigned char *buffer = !*data_ ? _buf : *data_;
         size_t buffersize = !*data_ ? _buf_size : size_;
 
-        if (in_progress == NULL)
+        if (in_progress () == NULL)
             return 0;
 
         size_t pos = 0;
@@ -88,11 +88,11 @@ template <typename T> class encoder_base_t : public i_encoder
             //  in the buffer.
             if (!_to_write) {
                 if (_new_msg_flag) {
-                    int rc = in_progress->close ();
+                    int rc = _in_progress->close ();
                     errno_assert (rc == 0);
-                    rc = in_progress->init ();
+                    rc = _in_progress->init ();
                     errno_assert (rc == 0);
-                    in_progress = NULL;
+                    _in_progress = NULL;
                     break;
                 }
                 (static_cast<T *> (this)->*_next) ();
@@ -130,8 +130,8 @@ template <typename T> class encoder_base_t : public i_encoder
 
     void load_msg (msg_t *msg_)
     {
-        zmq_assert (in_progress == NULL);
+        zmq_assert (in_progress () == NULL);
-        in_progress = msg_;
+        _in_progress = msg_;
         (static_cast<T *> (this)->*_next) ();
     }
 
@@ -152,6 +152,8 @@ template <typename T> class encoder_base_t : public i_encoder
         _new_msg_flag = new_msg_flag_;
     }
 
+    msg_t *in_progress () { return _in_progress; }
+
   private:
     //  Where to get the data to write from.
     unsigned char *_write_pos;
@@ -172,8 +174,7 @@ template <typename T> class encoder_base_t : public i_encoder
     encoder_base_t (const encoder_base_t &);
     void operator= (const encoder_base_t &);
 
-  protected:
+    msg_t *_in_progress;
-    msg_t *in_progress;
 };
 }
 

src/io_object.hpp

@@ -65,7 +65,7 @@ class io_object_t : public i_poll_events
     void reset_pollin (handle_t handle_);
     void set_pollout (handle_t handle_);
     void reset_pollout (handle_t handle_);
-    void add_timer (int timout_, int id_);
+    void add_timer (int timeout_, int id_);
     void cancel_timer (int id_);
 
     //  i_poll_events interface implementation.

src/ip.cpp

@@ -667,14 +667,14 @@ void zmq::make_socket_noninheritable (fd_t sock_)
     const BOOL brc = SetHandleInformation (reinterpret_cast<HANDLE> (sock_),
                                            HANDLE_FLAG_INHERIT, 0);
     win_assert (brc);
-#endif
+#elif (!defined ZMQ_HAVE_SOCK_CLOEXEC || !defined HAVE_ACCEPT4)                \
-
-#if (!defined ZMQ_HAVE_SOCK_CLOEXEC || !defined HAVE_ACCEPT4)                  \
   && defined FD_CLOEXEC
     //  If there 's no SOCK_CLOEXEC, let's try the second best option.
     //  Race condition can cause socket not to be closed (if fork happens
     //  between accept and this point).
     const int rc = fcntl (sock_, F_SETFD, FD_CLOEXEC);
     errno_assert (rc != -1);
+#else
+    LIBZMQ_UNUSED (sock_);
 #endif
 }

src/ip_resolver.hpp

@@ -88,6 +88,17 @@ class ip_resolver_t
     int resolve (ip_addr_t *ip_addr_, const char *name_);
 
   protected:
+    //  Virtual functions that are overridden in tests
+    virtual int do_getaddrinfo (const char *node_,
+                                const char *service_,
+                                const struct addrinfo *hints_,
+                                struct addrinfo **res_);
+
+    virtual void do_freeaddrinfo (struct addrinfo *res_);
+
+    virtual unsigned int do_if_nametoindex (const char *ifname_);
+
+  private:
     ip_resolver_options_t _options;
 
     int resolve_nic_name (ip_addr_t *ip_addr_, const char *nic_);
@@ -97,16 +108,6 @@ class ip_resolver_t
     int get_interface_name (unsigned long index_, char **dest_) const;
     int wchar_to_utf8 (const WCHAR *src_, char **dest_) const;
 #endif
-
-    //  Virtual functions that are overriden in tests
-    virtual int do_getaddrinfo (const char *node_,
-                                const char *service_,
-                                const struct addrinfo *hints_,
-                                struct addrinfo **res_);
-
-    virtual void do_freeaddrinfo (struct addrinfo *res_);
-
-    virtual unsigned int do_if_nametoindex (const char *ifname_);
 };
 }
 

src/ipc_address.cpp

@@ -43,13 +43,13 @@ zmq::ipc_address_t::ipc_address_t ()
     memset (&address, 0, sizeof address);
 }
 
-zmq::ipc_address_t::ipc_address_t (const sockaddr *sa, socklen_t sa_len)
+zmq::ipc_address_t::ipc_address_t (const sockaddr *sa_, socklen_t sa_len_)
 {
-    zmq_assert (sa && sa_len > 0);
+    zmq_assert (sa_ && sa_len_ > 0);
 
     memset (&address, 0, sizeof address);
-    if (sa->sa_family == AF_UNIX)
+    if (sa_->sa_family == AF_UNIX)
-        memcpy (&address, sa, sa_len);
+        memcpy (&address, sa_, sa_len_);
 }
 
 zmq::ipc_address_t::~ipc_address_t ()

src/ipc_address.hpp

@@ -44,7 +44,7 @@ class ipc_address_t
 {
   public:
     ipc_address_t ();
-    ipc_address_t (const sockaddr *sa, socklen_t sa_len);
+    ipc_address_t (const sockaddr *sa_, socklen_t sa_len_);
     ~ipc_address_t ();
 
     //  This function sets up the address for UNIX domain transport.

src/ipc_connecter.cpp

@@ -67,7 +67,7 @@ zmq::ipc_connecter_t::ipc_connecter_t (class io_thread_t *io_thread_,
     current_reconnect_ivl (options.reconnect_ivl)
 {
     zmq_assert (addr);
-    zmq_assert (addr->protocol == "ipc");
+    zmq_assert (addr->protocol == protocol_name::ipc);
     addr->to_string (endpoint);
     socket = session->get_socket ();
 }

src/mechanism.cpp

@@ -60,12 +60,12 @@ void zmq::mechanism_t::peer_routing_id (msg_t *msg_)
     msg_->set_flags (msg_t::routing_id);
 }
 
-void zmq::mechanism_t::set_user_id (const void *data_, size_t size_)
+void zmq::mechanism_t::set_user_id (const void *user_id_, size_t size_)
 {
-    _user_id.set (static_cast<const unsigned char *> (data_), size_);
+    _user_id.set (static_cast<const unsigned char *> (user_id_), size_);
     _zap_properties.ZMQ_MAP_INSERT_OR_EMPLACE (
       std::string (ZMQ_MSG_PROPERTY_USER_ID),
-      std::string (reinterpret_cast<const char *> (data_), size_));
+      std::string (reinterpret_cast<const char *> (user_id_), size_));
 }
 
 const zmq::blob_t &zmq::mechanism_t::get_user_id () const
@@ -159,20 +159,20 @@ size_t zmq::mechanism_t::property_len (const char *name_, size_t value_len_)
 #define ZMTP_PROPERTY_SOCKET_TYPE "Socket-Type"
 #define ZMTP_PROPERTY_IDENTITY "Identity"
 
-size_t zmq::mechanism_t::add_basic_properties (unsigned char *buf_,
+size_t zmq::mechanism_t::add_basic_properties (unsigned char *ptr_,
-                                               size_t buf_capacity_) const
+                                               size_t ptr_capacity_) const
 {
-    unsigned char *ptr = buf_;
+    unsigned char *ptr = ptr_;
 
     //  Add socket type property
     const char *socket_type = socket_type_string (options.type);
-    ptr += add_property (ptr, buf_capacity_, ZMTP_PROPERTY_SOCKET_TYPE,
+    ptr += add_property (ptr, ptr_capacity_, ZMTP_PROPERTY_SOCKET_TYPE,
                          socket_type, strlen (socket_type));
 
     //  Add identity (aka routing id) property
     if (options.type == ZMQ_REQ || options.type == ZMQ_DEALER
         || options.type == ZMQ_ROUTER) {
-        ptr += add_property (ptr, buf_capacity_ - (ptr - buf_),
+        ptr += add_property (ptr, ptr_capacity_ - (ptr - ptr_),
                              ZMTP_PROPERTY_IDENTITY, options.routing_id,
                              options.routing_id_size);
     }
@@ -182,10 +182,10 @@ size_t zmq::mechanism_t::add_basic_properties (unsigned char *buf_,
            options.app_metadata.begin ();
          it != options.app_metadata.end (); ++it)
         ptr +=
-          add_property (ptr, buf_capacity_ - (ptr - buf_), it->first.c_str (),
+          add_property (ptr, ptr_capacity_ - (ptr - ptr_), it->first.c_str (),
                         it->second.c_str (), strlen (it->second.c_str ()));
 
-    return ptr - buf_;
+    return ptr - ptr_;
 }
 
 size_t zmq::mechanism_t::basic_properties_len () const

src/msg.cpp

@@ -59,19 +59,18 @@ int zmq::msg_t::init (void *data_,
                       content_t *content_)
 {
     if (size_ < max_vsm_size) {
-        int const rc = init_size (size_);
+        const int rc = init_size (size_);
 
         if (rc != -1) {
             memcpy (data (), data_, size_);
             return 0;
         }
         return -1;
-
-    } else if (content_) {
-        return init_external_storage (content_, data_, size_, ffn_, hint_);
-    } else {
-        return init_data (data_, size_, ffn_, hint_);
     }
+    if (content_) {
+        return init_external_storage (content_, data_, size_, ffn_, hint_);
+    }
+    return init_data (data_, size_, ffn_, hint_);
 }
 
 int zmq::msg_t::init ()

src/options.cpp

@@ -183,16 +183,20 @@ int do_setsockopt_set (const void *const optval_,
     if (optvallen_ == 0 && optval_ == NULL) {
         set_->clear ();
         return 0;
-    } else if (optvallen_ == sizeof (T) && optval_ != NULL) {
+    }
-        set_->insert (*((const T *) optval_));
+    if (optvallen_ == sizeof (T) && optval_ != NULL) {
+        set_->insert (*(static_cast<const T *> (optval_)));
         return 0;
     }
     return sockopt_invalid ();
 }
 
+// TODO why is 1000 a sensible default?
+const int default_hwm = 1000;
+
 zmq::options_t::options_t () :
-    sndhwm (1000),
+    sndhwm (default_hwm),
-    rcvhwm (1000),
+    rcvhwm (default_hwm),
     affinity (0),
     routing_id_size (0),
     rate (100),
@@ -321,7 +325,7 @@ int zmq::options_t::setsockopt (int option_,
 
         case ZMQ_ROUTING_ID:
             //  Routing id is any binary string from 1 to 255 octets
-            if (optvallen_ > 0 && optvallen_ < 256) {
+            if (optvallen_ > 0 && optvallen_ <= UCHAR_MAX) {
                 routing_id_size = static_cast<unsigned char> (optvallen_);
                 memcpy (routing_id, optval_, routing_id_size);
                 return 0;
@@ -538,7 +542,8 @@ int zmq::options_t::setsockopt (int option_,
             if (optvallen_ == 0 && optval_ == NULL) {
                 mechanism = ZMQ_NULL;
                 return 0;
-            } else if (optvallen_ > 0 && optvallen_ < 256 && optval_ != NULL) {
+            } else if (optvallen_ > 0 && optvallen_ <= UCHAR_MAX
+                       && optval_ != NULL) {
                 plain_username.assign (static_cast<const char *> (optval_),
                                        optvallen_);
                 as_server = 0;
@@ -551,7 +556,8 @@ int zmq::options_t::setsockopt (int option_,
             if (optvallen_ == 0 && optval_ == NULL) {
                 mechanism = ZMQ_NULL;
                 return 0;
-            } else if (optvallen_ > 0 && optvallen_ < 256 && optval_ != NULL) {
+            } else if (optvallen_ > 0 && optvallen_ <= UCHAR_MAX
+                       && optval_ != NULL) {
                 plain_password.assign (static_cast<const char *> (optval_),
                                        optvallen_);
                 as_server = 0;
@@ -610,7 +616,7 @@ int zmq::options_t::setsockopt (int option_,
             break;
 
         case ZMQ_GSSAPI_PRINCIPAL:
-            if (optvallen_ > 0 && optvallen_ < 256 && optval_ != NULL) {
+            if (optvallen_ > 0 && optvallen_ <= UCHAR_MAX && optval_ != NULL) {
                 gss_principal.assign ((const char *) optval_, optvallen_);
                 mechanism = ZMQ_GSSAPI;
                 return 0;
@@ -618,7 +624,7 @@ int zmq::options_t::setsockopt (int option_,
             break;
 
         case ZMQ_GSSAPI_SERVICE_PRINCIPAL:
-            if (optvallen_ > 0 && optvallen_ < 256 && optval_ != NULL) {
+            if (optvallen_ > 0 && optvallen_ <= UCHAR_MAX && optval_ != NULL) {
                 gss_service_principal.assign ((const char *) optval_,
                                               optvallen_);
                 mechanism = ZMQ_GSSAPI;
@@ -721,11 +727,11 @@ int zmq::options_t::setsockopt (int option_,
 
         case ZMQ_METADATA:
             if (optvallen_ > 0 && !is_int) {
-                const std::string s (reinterpret_cast<const char *> (optval_));
+                const std::string s (static_cast<const char *> (optval_));
-                const size_t pos = s.find (":");
+                const size_t pos = s.find (':');
                 if (pos != std::string::npos && pos != 0
                     && pos != s.length () - 1) {
-                    std::string key = s.substr (0, pos);
+                    const std::string key = s.substr (0, pos);
                     if (key.compare (0, 2, "X-") == 0
                         && key.length () <= UCHAR_MAX) {
                         std::string val = s.substr (pos + 1, s.length ());
@@ -773,7 +779,7 @@ int zmq::options_t::getsockopt (int option_,
                                 void *optval_,
                                 size_t *optvallen_) const
 {
-    bool is_int = (*optvallen_ == sizeof (int));
+    const bool is_int = (*optvallen_ == sizeof (int));
     int *value = static_cast<int *> (optval_);
 #if defined(ZMQ_ACT_MILITANT)
     bool malformed = true; //  Did caller pass a bad option value?
@@ -1156,9 +1162,3 @@ int zmq::options_t::getsockopt (int option_,
     errno = EINVAL;
     return -1;
 }
-
-bool zmq::options_t::is_valid (int option_) const
-{
-    LIBZMQ_UNUSED (option_);
-    return true;
-}

src/options.hpp

@@ -69,8 +69,6 @@ struct options_t
     int setsockopt (int option_, const void *optval_, size_t optvallen_);
     int getsockopt (int option_, void *optval_, size_t *optvallen_) const;
 
-    bool is_valid (int option_) const;
-
     //  High-water marks for message pipes.
     int sndhwm;
     int rcvhwm;

src/raw_encoder.cpp

@@ -45,6 +45,6 @@ zmq::raw_encoder_t::~raw_encoder_t ()
 
 void zmq::raw_encoder_t::raw_message_ready ()
 {
-    next_step (in_progress->data (), in_progress->size (),
+    next_step (in_progress ()->data (), in_progress ()->size (),
                &raw_encoder_t::raw_message_ready, true);
 }

src/router.cpp

@@ -80,6 +80,8 @@ void zmq::router_t::xattach_pipe (pipe_t *pipe_, bool subscribe_to_all_)
 
         rc = pipe_->write (&probe_msg);
         // zmq_assert (rc) is not applicable here, since it is not a bug.
+        LIBZMQ_UNUSED (rc);
+
         pipe_->flush ();
 
         rc = probe_msg.close ();

src/session_base.cpp

@@ -515,7 +515,7 @@ void zmq::session_base_t::reconnect ()
     //  and reestablish later on
     if (_pipe && options.immediate == 1 && _addr->protocol != "pgm"
         && _addr->protocol != "epgm" && _addr->protocol != "norm"
-        && _addr->protocol != "udp") {
+        && _addr->protocol != protocol_name::udp) {
         _pipe->hiccup ();
         _pipe->terminate (false);
         _terminating_pipes.insert (_pipe);
@@ -557,10 +557,11 @@ void zmq::session_base_t::start_connecting (bool wait_)
 
     //  Create the connecter object.
 
-    if (_addr->protocol == "tcp") {
+    if (_addr->protocol == protocol_name::tcp) {
         if (!options.socks_proxy_address.empty ()) {
             address_t *proxy_address = new (std::nothrow)
-              address_t ("tcp", options.socks_proxy_address, this->get_ctx ());
+              address_t (protocol_name::tcp, options.socks_proxy_address,
+                         this->get_ctx ());
             alloc_assert (proxy_address);
             socks_connecter_t *connecter = new (std::nothrow)
               socks_connecter_t (io_thread, this, options, _addr, proxy_address,
@@ -578,7 +579,7 @@ void zmq::session_base_t::start_connecting (bool wait_)
 
 #if !defined ZMQ_HAVE_WINDOWS && !defined ZMQ_HAVE_OPENVMS                     \
   && !defined ZMQ_HAVE_VXWORKS
-    if (_addr->protocol == "ipc") {
+    if (_addr->protocol == protocol_name::ipc) {
         ipc_connecter_t *connecter = new (std::nothrow)
           ipc_connecter_t (io_thread, this, options, _addr, wait_);
         alloc_assert (connecter);
@@ -587,7 +588,7 @@ void zmq::session_base_t::start_connecting (bool wait_)
     }
 #endif
 #if defined ZMQ_HAVE_TIPC
-    if (_addr->protocol == "tipc") {
+    if (_addr->protocol == protocol_name::tipc) {
         tipc_connecter_t *connecter = new (std::nothrow)
           tipc_connecter_t (io_thread, this, options, _addr, wait_);
         alloc_assert (connecter);
@@ -596,7 +597,7 @@ void zmq::session_base_t::start_connecting (bool wait_)
     }
 #endif
 
-    if (_addr->protocol == "udp") {
+    if (_addr->protocol == protocol_name::udp) {
         zmq_assert (options.type == ZMQ_DISH || options.type == ZMQ_RADIO
                     || options.type == ZMQ_DGRAM);
 
@@ -698,7 +699,7 @@ void zmq::session_base_t::start_connecting (bool wait_)
 #endif // ZMQ_HAVE_NORM
 
 #if defined ZMQ_HAVE_VMCI
-    if (_addr->protocol == "vmci") {
+    if (_addr->protocol == protocol_name::vmci) {
         vmci_connecter_t *connecter = new (std::nothrow)
           vmci_connecter_t (io_thread, this, options, _addr, wait_);
         alloc_assert (connecter);

src/signaler.cpp

@@ -250,12 +250,13 @@ int zmq::signaler_t::wait (int timeout_)
     if (unlikely (rc < 0)) {
         errno_assert (errno == EINTR);
         return -1;
-    } else if (unlikely (rc == 0)) {
+    }
+    if (unlikely (rc == 0)) {
         errno = EAGAIN;
         return -1;
     }
 #ifdef HAVE_FORK
-    else if (unlikely (pid != getpid ())) {
+    if (unlikely (pid != getpid ())) {
         // we have forked and the file descriptor is closed. Emulate an interrupt
         // response.
         //printf("Child process %d signaler_t::wait returning simulating interrupt #2\n", getpid());

src/socket_base.cpp

@@ -295,9 +295,9 @@ int zmq::socket_base_t::check_protocol (const std::string &protocol_)
     if (protocol_ != "inproc"
 #if !defined ZMQ_HAVE_WINDOWS && !defined ZMQ_HAVE_OPENVMS                     \
   && !defined ZMQ_HAVE_VXWORKS
-        && protocol_ != "ipc"
+        && protocol_ != protocol_name::ipc
 #endif
-        && protocol_ != "tcp"
+        && protocol_ != protocol_name::tcp
 #if defined ZMQ_HAVE_OPENPGM
         //  pgm/epgm transports only available if 0MQ is compiled with OpenPGM.
         && protocol_ != "pgm"
@@ -305,15 +305,15 @@ int zmq::socket_base_t::check_protocol (const std::string &protocol_)
 #endif
 #if defined ZMQ_HAVE_TIPC
         // TIPC transport is only available on Linux.
-        && protocol_ != "tipc"
+        && protocol_ != protocol_name::tipc
 #endif
 #if defined ZMQ_HAVE_NORM
         && protocol_ != "norm"
 #endif
 #if defined ZMQ_HAVE_VMCI
-        && protocol_ != "vmci"
+        && protocol_ != protocol_name::vmci
 #endif
-        && protocol_ != "udp") {
+        && protocol_ != protocol_name::udp) {
         errno = EPROTONOSUPPORT;
         return -1;
     }
@@ -330,7 +330,7 @@ int zmq::socket_base_t::check_protocol (const std::string &protocol_)
     }
 #endif
 
-    if (protocol_ == "udp"
+    if (protocol_ == protocol_name::udp
         && (options.type != ZMQ_DISH && options.type != ZMQ_RADIO
             && options.type != ZMQ_DGRAM)) {
         errno = ENOCOMPATPROTO;
@@ -364,11 +364,6 @@ int zmq::socket_base_t::setsockopt (int option_,
 {
     scoped_optional_lock_t sync_lock (_thread_safe ? &_sync : NULL);
 
-    if (!options.is_valid (option_)) {
-        errno = EINVAL;
-        return -1;
-    }
-
     if (unlikely (_ctx_terminated)) {
         errno = ETERM;
         return -1;
@@ -516,7 +511,7 @@ int zmq::socket_base_t::bind (const char *addr_)
         return rc;
     }
 
-    if (protocol == "udp") {
+    if (protocol == protocol_name::udp) {
         if (!(options.type == ZMQ_DGRAM || options.type == ZMQ_DISH)) {
             errno = ENOCOMPATPROTO;
             return -1;
@@ -580,7 +575,7 @@ int zmq::socket_base_t::bind (const char *addr_)
         return -1;
     }
 
-    if (protocol == "tcp") {
+    if (protocol == protocol_name::tcp) {
         tcp_listener_t *listener =
           new (std::nothrow) tcp_listener_t (io_thread, this, options);
         alloc_assert (listener);
@@ -601,7 +596,7 @@ int zmq::socket_base_t::bind (const char *addr_)
 
 #if !defined ZMQ_HAVE_WINDOWS && !defined ZMQ_HAVE_OPENVMS                     \
   && !defined ZMQ_HAVE_VXWORKS
-    if (protocol == "ipc") {
+    if (protocol == protocol_name::ipc) {
         ipc_listener_t *listener =
           new (std::nothrow) ipc_listener_t (io_thread, this, options);
         alloc_assert (listener);
@@ -621,7 +616,7 @@ int zmq::socket_base_t::bind (const char *addr_)
     }
 #endif
 #if defined ZMQ_HAVE_TIPC
-    if (protocol == "tipc") {
+    if (protocol == protocol_name::tipc) {
         tipc_listener_t *listener =
           new (std::nothrow) tipc_listener_t (io_thread, this, options);
         alloc_assert (listener);
@@ -641,7 +636,7 @@ int zmq::socket_base_t::bind (const char *addr_)
     }
 #endif
 #if defined ZMQ_HAVE_VMCI
-    if (protocol == "vmci") {
+    if (protocol == protocol_name::vmci) {
         vmci_listener_t *listener =
           new (std::nothrow) vmci_listener_t (io_thread, this, options);
         alloc_assert (listener);
@@ -814,7 +809,7 @@ int zmq::socket_base_t::connect (const char *addr_)
     alloc_assert (paddr);
 
     //  Resolve address (if needed by the protocol)
-    if (protocol == "tcp") {
+    if (protocol == protocol_name::tcp) {
         //  Do some basic sanity checks on tcp:// address syntax
         //  - hostname starts with digit or letter, with embedded '-' or '.'
         //  - IPv6 address may contain hex chars and colons.
@@ -858,7 +853,7 @@ int zmq::socket_base_t::connect (const char *addr_)
     }
 #if !defined ZMQ_HAVE_WINDOWS && !defined ZMQ_HAVE_OPENVMS                     \
   && !defined ZMQ_HAVE_VXWORKS
-    else if (protocol == "ipc") {
+    else if (protocol == protocol_name::ipc) {
         paddr->resolved.ipc_addr = new (std::nothrow) ipc_address_t ();
         alloc_assert (paddr->resolved.ipc_addr);
         int rc = paddr->resolved.ipc_addr->resolve (address.c_str ());
@@ -869,7 +864,7 @@ int zmq::socket_base_t::connect (const char *addr_)
     }
 #endif
 
-    if (protocol == "udp") {
+    if (protocol == protocol_name::udp) {
         if (options.type != ZMQ_RADIO) {
             errno = ENOCOMPATPROTO;
             LIBZMQ_DELETE (paddr);
@@ -902,7 +897,7 @@ int zmq::socket_base_t::connect (const char *addr_)
     }
 #endif
 #if defined ZMQ_HAVE_TIPC
-    else if (protocol == "tipc") {
+    else if (protocol == protocol_name::tipc) {
         paddr->resolved.tipc_addr = new (std::nothrow) tipc_address_t ();
         alloc_assert (paddr->resolved.tipc_addr);
         int rc = paddr->resolved.tipc_addr->resolve (address.c_str ());
@@ -922,7 +917,7 @@ int zmq::socket_base_t::connect (const char *addr_)
     }
 #endif
 #if defined ZMQ_HAVE_VMCI
-    else if (protocol == "vmci") {
+    else if (protocol == protocol_name::vmci) {
         paddr->resolved.vmci_addr =
           new (std::nothrow) vmci_address_t (this->get_ctx ());
         alloc_assert (paddr->resolved.vmci_addr);
@@ -942,7 +937,8 @@ int zmq::socket_base_t::connect (const char *addr_)
     //  PGM does not support subscription forwarding; ask for all data to be
     //  sent to this pipe. (same for NORM, currently?)
     bool subscribe_to_all = protocol == "pgm" || protocol == "epgm"
-                            || protocol == "norm" || protocol == "udp";
+                            || protocol == "norm"
+                            || protocol == protocol_name::udp;
     pipe_t *newpipe = NULL;
 
     if (options.immediate != 1 || subscribe_to_all) {
@@ -1044,7 +1040,7 @@ int zmq::socket_base_t::term_endpoint (const char *addr_)
     // IPv4-in-IPv6 mapping (EG: tcp://[::ffff:127.0.0.1]:9999), so try to
     // resolve before giving up. Given at this stage we don't know whether a
     // socket is connected or bound, try with both.
-    if (protocol == "tcp") {
+    if (protocol == protocol_name::tcp) {
         if (_endpoints.find (resolved_addr) == _endpoints.end ()) {
             tcp_address_t *tcp_addr = new (std::nothrow) tcp_address_t ();
             alloc_assert (tcp_addr);
@@ -1581,7 +1577,7 @@ void zmq::socket_base_t::extract_flags (msg_t *msg_)
     _rcvmore = (msg_->flags () & msg_t::more) != 0;
 }
 
-int zmq::socket_base_t::monitor (const char *addr_, int events_)
+int zmq::socket_base_t::monitor (const char *endpoint_, int events_)
 {
     scoped_lock_t lock (_monitor_sync);
 
@@ -1591,14 +1587,14 @@ int zmq::socket_base_t::monitor (const char *addr_, int events_)
     }
 
     //  Support deregistering monitoring endpoints as well
-    if (addr_ == NULL) {
+    if (endpoint_ == NULL) {
         stop_monitor ();
         return 0;
     }
     //  Parse addr_ string.
     std::string protocol;
     std::string address;
-    if (parse_uri (addr_, protocol, address) || check_protocol (protocol))
+    if (parse_uri (endpoint_, protocol, address) || check_protocol (protocol))
         return -1;
 
     //  Event notification only supported over inproc://
@@ -1624,7 +1620,7 @@ int zmq::socket_base_t::monitor (const char *addr_, int events_)
         stop_monitor (false);
 
     //  Spawn the monitor socket endpoint
-    rc = zmq_bind (_monitor_socket, addr_);
+    rc = zmq_bind (_monitor_socket, endpoint_);
     if (rc == -1)
         stop_monitor (false);
     return rc;
@@ -1813,34 +1809,35 @@ std::string zmq::routing_socket_base_t::extract_connect_routing_id ()
     return res;
 }
 
-void zmq::routing_socket_base_t::add_out_pipe (blob_t routing_id, pipe_t *pipe_)
+void zmq::routing_socket_base_t::add_out_pipe (blob_t routing_id_,
+                                               pipe_t *pipe_)
 {
     //  Add the record into output pipes lookup table
     const out_pipe_t outpipe = {pipe_, true};
     const bool ok =
-      _out_pipes.ZMQ_MAP_INSERT_OR_EMPLACE (ZMQ_MOVE (routing_id), outpipe)
+      _out_pipes.ZMQ_MAP_INSERT_OR_EMPLACE (ZMQ_MOVE (routing_id_), outpipe)
         .second;
     zmq_assert (ok);
 }
 
-bool zmq::routing_socket_base_t::has_out_pipe (const blob_t &routing_id) const
+bool zmq::routing_socket_base_t::has_out_pipe (const blob_t &routing_id_) const
 {
-    return 0 != _out_pipes.count (routing_id);
+    return 0 != _out_pipes.count (routing_id_);
 }
 
 zmq::routing_socket_base_t::out_pipe_t *
-zmq::routing_socket_base_t::lookup_out_pipe (const blob_t &routing_id)
+zmq::routing_socket_base_t::lookup_out_pipe (const blob_t &routing_id_)
 {
     // TODO we could probably avoid constructor a temporary blob_t to call this function
-    out_pipes_t::iterator it = _out_pipes.find (routing_id);
+    out_pipes_t::iterator it = _out_pipes.find (routing_id_);
     return it == _out_pipes.end () ? NULL : &it->second;
 }
 
 const zmq::routing_socket_base_t::out_pipe_t *
-zmq::routing_socket_base_t::lookup_out_pipe (const blob_t &routing_id) const
+zmq::routing_socket_base_t::lookup_out_pipe (const blob_t &routing_id_) const
 {
     // TODO we could probably avoid constructor a temporary blob_t to call this function
-    out_pipes_t::const_iterator it = _out_pipes.find (routing_id);
+    out_pipes_t::const_iterator it = _out_pipes.find (routing_id_);
     return it == _out_pipes.end () ? NULL : &it->second;
 }
 
@@ -1851,9 +1848,9 @@ void zmq::routing_socket_base_t::erase_out_pipe (pipe_t *pipe_)
 }
 
 zmq::routing_socket_base_t::out_pipe_t
-zmq::routing_socket_base_t::try_erase_out_pipe (const blob_t &routing_id)
+zmq::routing_socket_base_t::try_erase_out_pipe (const blob_t &routing_id_)
 {
-    const out_pipes_t::iterator it = _out_pipes.find (routing_id);
+    const out_pipes_t::iterator it = _out_pipes.find (routing_id_);
     out_pipe_t res = {NULL, false};
     if (it != _out_pipes.end ()) {
         res = it->second;

src/socket_base.hpp

@@ -137,8 +137,8 @@ class socket_base_t : public own_t,
 
     //  Query the state of a specific peer. The default implementation
     //  always returns an ENOTSUP error.
-    virtual int get_peer_state (const void *identity_,
+    virtual int get_peer_state (const void *routing_id_,
-                                size_t identity_size_) const;
+                                size_t routing_id_size_) const;
 
   protected:
     socket_base_t (zmq::ctx_t *parent_,
@@ -186,7 +186,7 @@ class socket_base_t : public own_t,
 
   private:
     // test if event should be sent and then dispatch it
-    void event (const std::string &addr_, intptr_t fd_, int type_);
+    void event (const std::string &addr_, intptr_t value_, int type_);
 
     // Socket event data dispatch
     void monitor_event (int event_, intptr_t value_, const std::string &addr_);
@@ -318,19 +318,18 @@ class routing_socket_base_t : public socket_base_t
         bool active;
     };
 
-    void add_out_pipe (blob_t routing_id, pipe_t *pipe_);
+    void add_out_pipe (blob_t routing_id_, pipe_t *pipe_);
-    bool has_out_pipe (const blob_t &routing_id) const;
+    bool has_out_pipe (const blob_t &routing_id_) const;
-    out_pipe_t *lookup_out_pipe (const blob_t &routing_id);
+    out_pipe_t *lookup_out_pipe (const blob_t &routing_id_);
-    const out_pipe_t *lookup_out_pipe (const blob_t &routing_id) const;
+    const out_pipe_t *lookup_out_pipe (const blob_t &routing_id_) const;
     void erase_out_pipe (pipe_t *pipe_);
-    out_pipe_t try_erase_out_pipe (const blob_t &routing_id);
+    out_pipe_t try_erase_out_pipe (const blob_t &routing_id_);
-    template <typename Func> bool any_of_out_pipes (Func func)
+    template <typename Func> bool any_of_out_pipes (Func func_)
     {
         bool res = false;
         for (out_pipes_t::iterator it = _out_pipes.begin ();
-             it != _out_pipes.end (); ++it) {
+             it != _out_pipes.end () && !res; ++it) {
-            if (res |= func (*it->second.pipe))
+            res |= func_ (*it->second.pipe);
-                break;
         }
 
         return res;

src/socks.cpp

@@ -45,7 +45,7 @@ zmq::socks_greeting_t::socks_greeting_t (uint8_t method_) : num_methods (1)
     methods[0] = method_;
 }
 
-zmq::socks_greeting_t::socks_greeting_t (uint8_t *methods_,
+zmq::socks_greeting_t::socks_greeting_t (const uint8_t *methods_,
                                          uint8_t num_methods_) :
     num_methods (num_methods_)
 {
@@ -273,8 +273,8 @@ bool zmq::socks_response_decoder_t::message_ready () const
         return _bytes_read == 10;
     if (atyp == 0x03)
         return _bytes_read > 4 && _bytes_read == 4 + 1 + _buf[4] + 2u;
-    else
+
-        return _bytes_read == 22;
+    return _bytes_read == 22;
 }
 
 zmq::socks_response_t zmq::socks_response_decoder_t::decode ()

src/socks.hpp

@@ -39,7 +39,7 @@ namespace zmq
 struct socks_greeting_t
 {
     socks_greeting_t (uint8_t method_);
-    socks_greeting_t (uint8_t *methods_, uint8_t num_methods_);
+    socks_greeting_t (const uint8_t *methods_, uint8_t num_methods_);
 
     uint8_t methods[UINT8_MAX];
     const size_t num_methods;

src/socks_connecter.cpp

@@ -72,7 +72,7 @@ zmq::socks_connecter_t::socks_connecter_t (class io_thread_t *io_thread_,
     _current_reconnect_ivl (options.reconnect_ivl)
 {
     zmq_assert (_addr);
-    zmq_assert (_addr->protocol == "tcp");
+    zmq_assert (_addr->protocol == protocol_name::tcp);
     _proxy_addr->to_string (_endpoint);
     _socket = _session->get_socket ();
 }

src/tcp_address.cpp

@@ -71,10 +71,6 @@ zmq::tcp_address_t::tcp_address_t (const sockaddr *sa_, socklen_t sa_len_) :
         memcpy (&_address.ipv6, sa_, sizeof (_address.ipv6));
 }
 
-zmq::tcp_address_t::~tcp_address_t ()
-{
-}
-
 int zmq::tcp_address_t::resolve (const char *name_, bool local_, bool ipv6_)
 {
     // Test the ';' to know if we have a source address in name_
@@ -117,7 +113,7 @@ int zmq::tcp_address_t::resolve (const char *name_, bool local_, bool ipv6_)
     return resolver.resolve (&_address, name_);
 }
 
-int zmq::tcp_address_t::to_string (std::string &addr_)
+int zmq::tcp_address_t::to_string (std::string &addr_) const
 {
     if (_address.family () != AF_INET && _address.family () != AF_INET6) {
         addr_.clear ();
@@ -127,8 +123,8 @@ int zmq::tcp_address_t::to_string (std::string &addr_)
     //  Not using service resolving because of
     //  https://github.com/zeromq/libzmq/commit/1824574f9b5a8ce786853320e3ea09fe1f822bc4
     char hbuf[NI_MAXHOST];
-    int rc = getnameinfo (addr (), addrlen (), hbuf, sizeof (hbuf), NULL, 0,
+    const int rc = getnameinfo (addr (), addrlen (), hbuf, sizeof (hbuf), NULL,
-                          NI_NUMERICHOST);
+                                0, NI_NUMERICHOST);
     if (rc != 0) {
         addr_.clear ();
         return rc;
@@ -148,28 +144,22 @@ int zmq::tcp_address_t::to_string (std::string &addr_)
 
 const sockaddr *zmq::tcp_address_t::addr () const
 {
-    return &_address.generic;
+    return _address.as_sockaddr ();
 }
 
 socklen_t zmq::tcp_address_t::addrlen () const
 {
-    if (_address.generic.sa_family == AF_INET6)
+    return _address.sockaddr_len ();
-        return static_cast<socklen_t> (sizeof (_address.ipv6));
-
-    return static_cast<socklen_t> (sizeof (_address.ipv4));
 }
 
 const sockaddr *zmq::tcp_address_t::src_addr () const
 {
-    return &_source_address.generic;
+    return _source_address.as_sockaddr ();
 }
 
 socklen_t zmq::tcp_address_t::src_addrlen () const
 {
-    if (_address.family () == AF_INET6)
+    return _source_address.sockaddr_len ();
-        return static_cast<socklen_t> (sizeof (_source_address.ipv6));
-
-    return static_cast<socklen_t> (sizeof (_source_address.ipv4));
 }
 
 bool zmq::tcp_address_t::has_src_addr () const
@@ -186,10 +176,9 @@ sa_family_t zmq::tcp_address_t::family () const
     return _address.family ();
 }
 
-zmq::tcp_address_mask_t::tcp_address_mask_t () :
+zmq::tcp_address_mask_t::tcp_address_mask_t () : _address_mask (-1)
-    tcp_address_t (),
-    _address_mask (-1)
 {
+    memset (&_network_address, 0, sizeof (_network_address));
 }
 
 int zmq::tcp_address_mask_t::mask () const
@@ -224,35 +213,39 @@ int zmq::tcp_address_mask_t::resolve (const char *name_, bool ipv6_)
 
     ip_resolver_t resolver (resolver_opts);
 
-    const int rc = resolver.resolve (&_address, addr_str.c_str ());
+    const int rc = resolver.resolve (&_network_address, addr_str.c_str ());
     if (rc != 0)
         return rc;
 
     // Parse the cidr mask number.
-    const int full_mask_ipv4 = sizeof (_address.ipv4.sin_addr) * CHAR_BIT;
+    const int full_mask_ipv4 =
-    const int full_mask_ipv6 = sizeof (_address.ipv6.sin6_addr) * CHAR_BIT;
+      sizeof (_network_address.ipv4.sin_addr) * CHAR_BIT;
+    const int full_mask_ipv6 =
+      sizeof (_network_address.ipv6.sin6_addr) * CHAR_BIT;
     if (mask_str.empty ()) {
-        _address_mask =
+        _address_mask = _network_address.family () == AF_INET6 ? full_mask_ipv6
-          _address.family () == AF_INET6 ? full_mask_ipv6 : full_mask_ipv4;
+                                                               : full_mask_ipv4;
     } else if (mask_str == "0")
         _address_mask = 0;
     else {
-        const int mask = atoi (mask_str.c_str ());
+        const long mask = strtol (mask_str.c_str (), NULL, 10);
         if ((mask < 1)
-            || (_address.family () == AF_INET6 && mask > full_mask_ipv6)
+            || (_network_address.family () == AF_INET6 && mask > full_mask_ipv6)
-            || (_address.family () != AF_INET6 && mask > full_mask_ipv4)) {
+            || (_network_address.family () != AF_INET6
+                && mask > full_mask_ipv4)) {
             errno = EINVAL;
             return -1;
         }
-        _address_mask = mask;
+        _address_mask = static_cast<int> (mask);
     }
 
     return 0;
 }
 
-int zmq::tcp_address_mask_t::to_string (std::string &addr_)
+int zmq::tcp_address_mask_t::to_string (std::string &addr_) const
 {
-    if (_address.family () != AF_INET && _address.family () != AF_INET6) {
+    if (_network_address.family () != AF_INET
+        && _network_address.family () != AF_INET6) {
         addr_.clear ();
         return -1;
     }
@@ -262,14 +255,15 @@ int zmq::tcp_address_mask_t::to_string (std::string &addr_)
     }
 
     char hbuf[NI_MAXHOST];
-    int rc = getnameinfo (addr (), addrlen (), hbuf, sizeof (hbuf), NULL, 0,
+    const int rc = getnameinfo (_network_address.as_sockaddr (),
-                          NI_NUMERICHOST);
+                                _network_address.sockaddr_len (), hbuf,
+                                sizeof (hbuf), NULL, 0, NI_NUMERICHOST);
     if (rc != 0) {
         addr_.clear ();
         return rc;
     }
 
-    if (_address.family () == AF_INET6) {
+    if (_network_address.family () == AF_INET6) {
         std::stringstream s;
         s << "[" << hbuf << "]/" << _address_mask;
         addr_ = s.str ();
@@ -285,9 +279,10 @@ bool zmq::tcp_address_mask_t::match_address (const struct sockaddr *ss_,
                                              const socklen_t ss_len_) const
 {
     zmq_assert (_address_mask != -1 && ss_ != NULL
-                && ss_len_ >= (socklen_t) sizeof (struct sockaddr));
+                && ss_len_
+                     >= static_cast<socklen_t> (sizeof (struct sockaddr)));
 
-    if (ss_->sa_family != _address.generic.sa_family)
+    if (ss_->sa_family != _network_address.generic.sa_family)
         return false;
 
     if (_address_mask > 0) {
@@ -298,15 +293,15 @@ bool zmq::tcp_address_mask_t::match_address (const struct sockaddr *ss_,
             their_bytes = reinterpret_cast<const uint8_t *> (
               &((reinterpret_cast<const struct sockaddr_in6 *> (ss_))
                   ->sin6_addr));
-            our_bytes =
+            our_bytes = reinterpret_cast<const uint8_t *> (
-              reinterpret_cast<const uint8_t *> (&_address.ipv6.sin6_addr);
+              &_network_address.ipv6.sin6_addr);
             mask = sizeof (struct in6_addr) * 8;
         } else {
             zmq_assert (ss_len_ == sizeof (struct sockaddr_in));
             their_bytes = reinterpret_cast<const uint8_t *> (&(
               (reinterpret_cast<const struct sockaddr_in *> (ss_))->sin_addr));
-            our_bytes =
+            our_bytes = reinterpret_cast<const uint8_t *> (
-              reinterpret_cast<const uint8_t *> (&_address.ipv4.sin_addr);
+              &_network_address.ipv4.sin_addr);
             mask = sizeof (struct in_addr) * 8;
         }
         if (_address_mask < mask)

src/tcp_address.hpp

@@ -44,7 +44,6 @@ class tcp_address_t
   public:
     tcp_address_t ();
     tcp_address_t (const sockaddr *sa_, socklen_t sa_len_);
-    virtual ~tcp_address_t ();
 
     //  This function translates textual TCP address into an address
     //  structure. If 'local' is true, names are resolved as local interface
@@ -53,7 +52,7 @@ class tcp_address_t
     int resolve (const char *name_, bool local_, bool ipv6_);
 
     //  The opposite to resolve()
-    virtual int to_string (std::string &addr_);
+    int to_string (std::string &addr_) const;
 
 #if defined ZMQ_HAVE_WINDOWS
     unsigned short family () const;
@@ -67,13 +66,13 @@ class tcp_address_t
     socklen_t src_addrlen () const;
     bool has_src_addr () const;
 
-  protected:
+  private:
     ip_addr_t _address;
     ip_addr_t _source_address;
     bool _has_src_addr;
 };
 
-class tcp_address_mask_t : public tcp_address_t
+class tcp_address_mask_t
 {
   public:
     tcp_address_mask_t ();
@@ -84,7 +83,7 @@ class tcp_address_mask_t : public tcp_address_t
     int resolve (const char *name_, bool ipv6_);
 
     // The opposite to resolve()
-    int to_string (std::string &addr_);
+    int to_string (std::string &addr_) const;
 
     int mask () const;
 
@@ -92,6 +91,7 @@ class tcp_address_mask_t : public tcp_address_t
                         const socklen_t ss_len_) const;
 
   private:
+    ip_addr_t _network_address;
     int _address_mask;
 };
 }

src/tcp_connecter.cpp

@@ -82,7 +82,7 @@ zmq::tcp_connecter_t::tcp_connecter_t (class io_thread_t *io_thread_,
     _socket (_session->get_socket ())
 {
     zmq_assert (_addr);
-    zmq_assert (_addr->protocol == "tcp");
+    zmq_assert (_addr->protocol == protocol_name::tcp);
     _addr->to_string (_endpoint);
     // TODO the return value is unused! what if it fails? if this is impossible
     // or does not matter, change such that endpoint in initialized using an

src/v1_encoder.cpp

@@ -49,14 +49,14 @@ zmq::v1_encoder_t::~v1_encoder_t ()
 void zmq::v1_encoder_t::size_ready ()
 {
     //  Write message body into the buffer.
-    next_step (in_progress->data (), in_progress->size (),
+    next_step (in_progress ()->data (), in_progress ()->size (),
                &v1_encoder_t::message_ready, true);
 }
 
 void zmq::v1_encoder_t::message_ready ()
 {
     //  Get the message size.
-    size_t size = in_progress->size ();
+    size_t size = in_progress ()->size ();
 
     //  Account for the 'flags' byte.
     size++;
@@ -66,12 +66,12 @@ void zmq::v1_encoder_t::message_ready ()
     //  message size. In both cases 'flags' field follows.
     if (size < UCHAR_MAX) {
         _tmpbuf[0] = static_cast<unsigned char> (size);
-        _tmpbuf[1] = (in_progress->flags () & msg_t::more);
+        _tmpbuf[1] = (in_progress ()->flags () & msg_t::more);
         next_step (_tmpbuf, 2, &v1_encoder_t::size_ready, false);
     } else {
         _tmpbuf[0] = UCHAR_MAX;
         put_uint64 (_tmpbuf + 1, size);
-        _tmpbuf[9] = (in_progress->flags () & msg_t::more);
+        _tmpbuf[9] = (in_progress ()->flags () & msg_t::more);
         next_step (_tmpbuf, 10, &v1_encoder_t::size_ready, false);
     }
 }

src/v2_encoder.cpp

@@ -52,17 +52,17 @@ void zmq::v2_encoder_t::message_ready ()
     //  Encode flags.
     unsigned char &protocol_flags = _tmp_buf[0];
     protocol_flags = 0;
-    if (in_progress->flags () & msg_t::more)
+    if (in_progress ()->flags () & msg_t::more)
         protocol_flags |= v2_protocol_t::more_flag;
-    if (in_progress->size () > UCHAR_MAX)
+    if (in_progress ()->size () > UCHAR_MAX)
         protocol_flags |= v2_protocol_t::large_flag;
-    if (in_progress->flags () & msg_t::command)
+    if (in_progress ()->flags () & msg_t::command)
         protocol_flags |= v2_protocol_t::command_flag;
 
     //  Encode the message length. For messages less then 256 bytes,
     //  the length is encoded as 8-bit unsigned integer. For larger
     //  messages, 64-bit unsigned integer in network byte order is used.
-    const size_t size = in_progress->size ();
+    const size_t size = in_progress ()->size ();
     if (unlikely (size > UCHAR_MAX)) {
         put_uint64 (_tmp_buf + 1, size);
         next_step (_tmp_buf, 9, &v2_encoder_t::size_ready, false);
@@ -75,6 +75,6 @@ void zmq::v2_encoder_t::message_ready ()
 void zmq::v2_encoder_t::size_ready ()
 {
     //  Write message body into the buffer.
-    next_step (in_progress->data (), in_progress->size (),
+    next_step (in_progress ()->data (), in_progress ()->size (),
                &v2_encoder_t::message_ready, true);
 }

src/zmq.cpp

@@ -87,10 +87,10 @@ struct iovec
 #include "msg.hpp"
 #include "fd.hpp"
 #include "metadata.hpp"
-#include "signaler.hpp"
 #include "socket_poller.hpp"
 #include "timers.hpp"
 #include "ip.hpp"
+#include "address.hpp"
 
 #if defined ZMQ_HAVE_OPENPGM
 #define __PGM_WININT_H__
@@ -1489,7 +1489,7 @@ int zmq_device (int /* type */, void *frontend_, void *backend_)
 int zmq_has (const char *capability_)
 {
 #if !defined(ZMQ_HAVE_WINDOWS) && !defined(ZMQ_HAVE_OPENVMS)
-    if (strcmp (capability_, "ipc") == 0)
+    if (strcmp (capability_, zmq::protocol_name::ipc) == 0)
         return true;
 #endif
 #if defined(ZMQ_HAVE_OPENPGM)
@@ -1497,7 +1497,7 @@ int zmq_has (const char *capability_)
         return true;
 #endif
 #if defined(ZMQ_HAVE_TIPC)
-    if (strcmp (capability_, "tipc") == 0)
+    if (strcmp (capability_, zmq::protocol_name::tipc) == 0)
         return true;
 #endif
 #if defined(ZMQ_HAVE_NORM)
@@ -1513,7 +1513,7 @@ int zmq_has (const char *capability_)
         return true;
 #endif
 #if defined(ZMQ_HAVE_VMCI)
-    if (strcmp (capability_, "vmci") == 0)
+    if (strcmp (capability_, zmq::protocol_name::vmci) == 0)
         return true;
 #endif
 #if defined(ZMQ_BUILD_DRAFT_API)