C++ convenience bind macro (to avoid future end-user code changes)

Mental note: MQTT backend (seen in Python) needs threaded event delivery

ipaacalib/cpp/include/ipaaca/ipaaca-buffers.h

@@ -38,6 +38,10 @@
 #error "Please do not include this file directly, use ipaaca.h instead"
 #endif
 
+// Convenience macro to abstract from the bind implementation being used
+//  and possible future signature changes.
+#define IPAACA_BIND_CLASS_HANDLER(fn, inst) std::bind(fn, inst, std::placeholders::_1, std::placeholders::_2, std::placeholders::_3)
+
 
 /// Store for local IUs (used in OutputBuffer)
 class IUStore: public std::map<std::string, std::shared_ptr<IU> >

ipaacalib/cpp/src/ipaaca-tester.cc

@@ -99,7 +99,7 @@ class TesterCpp {
 		ipaaca::OutputBuffer::ptr ob = ipaaca::OutputBuffer::create("testerCpp");
 		ipaaca::InputBuffer::ptr ib = ipaaca::InputBuffer::create("testerCpp", std::set<std::string>{"#"}); // MQTT requires # as a wildcard!
 		ib->set_resend(true);
-		ib->register_handler(std::bind(&TesterCpp::handle_iu_inbuf, this, std::placeholders::_1, std::placeholders::_2, std::placeholders::_3));
+		ib->register_handler(IPAACA_BIND_CLASS_HANDLER(&TesterCpp::handle_iu_inbuf, this));
 		std::cout << "Listening for all IU events and sending a Message after 1 sec ..." << std::endl;
 		sleep(1);
                 auto msg = ipaaca::IU::create("testcategory");