iox-eclipse-iceoryx#218 Attempt to add ability to emplace sample via …

…function call.

Signed-off-by: Ithier Jeff (CC-AD/EYF1) <[email protected]>

iceoryx_examples/icedelivery/iox_publisher_modern.cpp

@@ -47,18 +47,18 @@ int main(int argc, char *argv[])
 
  // OR - if you want to loan a sample and construct the data with arbitrary logic
 
-// publisher.loan()
-// .and_then([&](iox::popo::Sample<Position>& sample){
-// getVehiclePosition(sample.allocation());
-// // OR
-// sample.emplace(77, 88, 99);
-// // OR
-// sample.emplace(getVehiclePosition);
+ publisher.loan()
+ .and_then([&](iox::popo::Sample<Position>& sample){
+ getVehiclePosition(sample.allocation());
+ // OR
+ sample.emplace(77.77, 88.88, 99.99);
+ // OR
+ sample.emplace(getVehiclePosition);
 
-// // sample.publish()
-// // OR
-//  // publisher.publish(std::move(sample));
-// });
+ // sample.publish()
+ // OR
+ publisher.publish(std::move(sample));
+ });
 
  return 0;
 }

iceoryx_posh/include/iceoryx_posh/experimental/popo/publisher.hpp

@@ -57,27 +57,38 @@ class Sample
  m_isEmpty = true;
  return *this;
  }
- template <typename... Args>
- void emplace(Args&&... args) noexcept
+ template <typename Arg, typename... Args>
+ auto emplace(Arg arg, Args... args)
+ -> typename std::enable_if<!std::is_same<std::decay<Arg>, cxx::function_ref<void(T*)>>::value>::type
  {
  if(m_samplePtr != nullptr)
  {
- new (m_samplePtr.get()) T(std::forward<Args>(args)...);
+ new (m_samplePtr.get()) T(std::forward<Arg>(arg), std::forward<Args>(args)...);
  m_isEmpty = false;
  }
  }
- void emplace(cxx::function_ref<void(T*)> f)
+ void emplace(cxx::function_ref<void(T*)> f) noexcept
  {
  f(m_samplePtr.get());
  m_isEmpty = false;
  }
+// template <typename... Args>
+// void emplace(Args&&... args) noexcept
+// {
+// if(m_samplePtr != nullptr)
+// {
+// new (m_samplePtr.get()) T(std::forward<Args>(args)...);
+// m_isEmpty = false;
+// }
+// }
  void publish() noexcept
  {
  m_publisher.publish(std::move(*this));
  }
 private:
- const cxx::unique_ptr<T> m_samplePtr = nullptr;
  bool m_isEmpty = true;
+
+ cxx::unique_ptr<T> m_samplePtr = nullptr;
  Publisher<T>& m_publisher;
 };