Merge pull request #313 from gummif/gfa/socket-ctor

Problem: socket_t can not be default constructed

Author: sigiesec

tests/socket.cpp

@@ -9,13 +9,27 @@ static_assert(std::is_nothrow_swappable<zmq::socket_t>::value,
               "socket_t should be nothrow swappable");
 #endif
 
+TEST_CASE("socket default ctor", "[socket]")
+{
+    zmq::socket_t socket;
+}
+
 TEST_CASE("socket create destroy", "[socket]")
 {
     zmq::context_t context;
     zmq::socket_t socket(context, ZMQ_ROUTER);
 }
 
 #ifdef ZMQ_CPP11
+TEST_CASE("socket create assign", "[socket]")
+{
+    zmq::context_t context;
+    zmq::socket_t socket(context, ZMQ_ROUTER);
+    CHECK(static_cast<void*>(socket));
+    socket = {};
+    CHECK(!static_cast<void*>(socket));
+}
+
 TEST_CASE("socket create by enum and destroy", "[socket]")
 {
     zmq::context_t context;

zmq.hpp

@@ -646,6 +646,12 @@ class socket_t
     friend class monitor_t;
 
   public:
+    socket_t() ZMQ_NOTHROW
+      : ptr(ZMQ_NULLPTR)
+      , ctxptr(ZMQ_NULLPTR)
+    {
+    }
+
     socket_t(context_t &context_, int type_)
         : ptr(zmq_socket(static_cast<void*>(context_), type_))
         , ctxptr(static_cast<void*>(context_))