Merge pull request Abc-Arbitrage#13 from slumber/slumber/Abc-Arbitrag…

…egh-12-event-poller

EventPoller: eliminate std::function in poll() arguments

Disruptor/EventPoller.h

@@ -4,6 +4,8 @@
 #include <functional>
 #include <memory>
 
+#include <boost/poly_collection/detail/is_invocable.hpp>
+
 #include "Disruptor/FixedSequenceGroup.h"
 #include "Disruptor/IDataProvider.h"
 #include "Disruptor/ISequencer.h"
@@ -36,8 +38,13 @@ namespace Disruptor
  , m_gatingSequence(gatingSequence)
  {}
 
- PollState poll(const std::function< bool(T&, std::int64_t, bool) >& eventHandler)
+ template <class TEventHandler>
+ PollState poll(TEventHandler&& eventHandler)
  {
+ using boost::poly_collection::detail::is_invocable_r;
+ static_assert(is_invocable_r<bool, TEventHandler, T&, std::int64_t, bool>::value,
+ "eventHandler should have the following signature: bool(T&, std::int64_t, bool)");
+
  auto currentSequence = m_sequence->value();
  auto nextSequence = currentSequence + 1;
  auto availableSequence = m_sequencer->getHighestPublishedSequence(nextSequence, m_gatingSequence->value());