From ccbbc9591df77bb25704361f318069170c457ffa Mon Sep 17 00:00:00 2001
From: Alexey Rybalchenko <alexryba@gmail.com>
Date: Fri, 15 Dec 2017 14:44:17 +0100
Subject: [PATCH] FairMQ: Add hint argument to the region callback, settable
 per message.

---
 examples/advanced/Region/FairMQExampleRegionSampler.cxx | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/examples/advanced/Region/FairMQExampleRegionSampler.cxx b/examples/advanced/Region/FairMQExampleRegionSampler.cxx
index e5bd2743..217a23c6 100644
--- a/examples/advanced/Region/FairMQExampleRegionSampler.cxx
+++ b/examples/advanced/Region/FairMQExampleRegionSampler.cxx
@@ -38,7 +38,7 @@ void FairMQExampleRegionSampler::InitTask()
     fRegion = FairMQUnmanagedRegionPtr(NewUnmanagedRegionFor("data",
                                                              0,
                                                              10000000,
-                                                             [this](void* data, size_t size) { // callback to be called when message buffers no longer needed by transport
+                                                             [this](void* data, size_t size, void* hint) { // callback to be called when message buffers no longer needed by transport
                                                                  --fNumUnackedMsgs;
                                                                  if (fMaxIterations > 0)
                                                                  {
@@ -54,8 +54,10 @@ bool FairMQExampleRegionSampler::ConditionalRun()
                                         0, // sub-channel
                                         fRegion, // region
                                         fRegion->GetData(), // ptr within region
-                                        fMsgSize // offset from ptr
+                                        fMsgSize, // offset from ptr
+                                        nullptr // hint
                                         ));
+
     if (Send(msg, "data", 0) > 0)
     {
         ++fNumUnackedMsgs;