zmqconfig.h is currently not really needed anywhere, except that
it declares zmqError (which is then defined in
zmqnotificationinterface.cpp). Note in particular that there is
no need to conditionally include zmq.h only if ZMQ is enabled, because
the place in the core code where the ZMQ library itself is included
(init.cpp) is conditional already on that.
This commit removes zmqconfig.h and replaces it by a much simpler
zmqutil.h library for zmqError. The definition of the function is
moved to the matching (newly created) zmqutil.cpp.
Instead of returning a raw pointer from CZMQNotifierFactory and
implicitly requiring the caller to know that it has to take ownership,
return a std::unique_ptr to make this explicit.
This also changes the typedef for CZMQNotifierFactory to use the new
C++11 using syntax, which makes it (a little) less cryptic.
- removes mapBlockIndex find operation
- theoretically allows removing the cs_main lock during zqm notification while introducing a new file position lock
Continues Johnathan Corgan's work.
Publishing multipart messages
Bugfix: Add missing zmq header includes
Bugfix: Adjust build system to link ZeroMQ code for Qt binaries
