Rename so github renders syntax highlighting

main.cpp

@@ -0,0 +1,61 @@
+#include <cstdlib>
+#include <fairlogger/Logger.h>
+#include <fairmq/SDK.h>
+#include <fairmq/Version.h>
+#include <string>
+
+int main(int argc, char *argv[]) {
+  fair::Logger::SetConsoleSeverity("debug");
+
+  // workaround https://github.com/FairRootGroup/DDS/issues/24
+  std::string path(std::getenv("PATH"));
+  path = std::string("@FairMQ_BINDIR@:") + path;
+  setenv("PATH", path.c_str(), 1);
+
+  LOG(debug) << "FairMQ " << FAIRMQ_GIT_VERSION << " build "
+             << FAIRMQ_BUILD_TYPE;
+
+  fair::mq::sdk::DDSEnvironment ddsEnv;
+  LOG(debug) << ddsEnv;
+
+  fair::mq::sdk::DDSSession ddsSession(ddsEnv);
+  ddsSession.StopOnDestruction();
+  LOG(debug) << ddsSession;
+
+  fair::mq::sdk::DDSTopology ddsTopo(
+      "@FairMQ_DATADIR@/ex-dds-topology-infinite.xml", ddsEnv);
+  LOG(debug) << ddsTopo;
+
+  ddsSession.SubmitAgents(ddsTopo.GetNumRequiredAgents());
+
+  ddsSession.ActivateTopology(ddsTopo);
+
+  for (const auto &ddsAgent : ddsSession.RequestAgentInfo()) {
+    LOG(debug) << ddsAgent;
+  }
+
+  fair::mq::sdk::Topology fairmqTopo(ddsTopo, ddsSession);
+
+  using fair::mq::sdk::TopologyTransition;
+  for (auto transition :
+       {TopologyTransition::InitDevice, TopologyTransition::CompleteInit,
+        TopologyTransition::Bind, TopologyTransition::Connect,
+        TopologyTransition::InitTask, TopologyTransition::Run,
+        TopologyTransition::Stop, TopologyTransition::ResetTask,
+        TopologyTransition::ResetDevice, TopologyTransition::End}) {
+    auto [ec, states] =
+        fairmqTopo.ChangeState(transition, std::chrono::milliseconds(300));
+    if (!ec) {
+      // End transition does not yet wait for devices to acknowledge in v1.4.8
+      if (transition != TopologyTransition::End) {
+        LOG(info) << states.size() << " devices transitioned to "
+                  << fair::mq::sdk::AggregateState(states);
+      }
+    } else {
+      LOG(error) << ec;
+      return ec.value();
+    }
+  }
+
+  return 0;
+}