diff --git a/include/rosa/deluxe/DeluxeContext.hpp b/include/rosa/deluxe/DeluxeContext.hpp
index a1a5588..24f86fb 100755
--- a/include/rosa/deluxe/DeluxeContext.hpp
+++ b/include/rosa/deluxe/DeluxeContext.hpp
@@ -1,292 +1,296 @@
 //===-- rosa/deluxe/DeluxeContext.hpp ---------------------------*- C++ -*-===//
 //
 //                                 The RoSA Framework
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file rosa/deluxe/DeluxeContext.hpp
 ///
 /// \author David Juhasz (david.juhasz@tuwien.ac.at)
 ///
 /// \date 2017
 ///
 /// \brief Public interface for the *deluxe interface* for working with agent
 ///        systems.
 ///
 //===----------------------------------------------------------------------===//
 
 #ifndef ROSA_DELUXE_DELUXECONTEXT_HPP
 #define ROSA_DELUXE_DELUXECONTEXT_HPP
 
 #include "rosa/deluxe/DeluxeSystem.hpp"
 
 #include "rosa/support/types.hpp"
 
 #include <iterator>
 #include <memory>
 #include <set>
 
 /// Local helper macro to log and return a
 /// \c rosa::deluxe::DeluxeContext::ErrorCode value.
 ///
 /// Creates a debug message with the stringified value and returns the value.
 ///
 /// \param Err \c rosa::deluxe::DeluxeContext::ErrorCode value to log and
 /// return
 #define DCRETERROR(Err)                                                        \
   {                                                                            \
     LOG_DEBUG(#Err);                                                           \
     return Err;                                                                \
   }
 
 namespace rosa {
 namespace deluxe {
 
 /// Defines the *deluxe interface*.
 class DeluxeContext {
 
   /// A system owned by \p this object.
   ///
   /// \note The reference is kept in a \c std::shared_ptr because of the member
   /// function \c rosa::deluxe::DeluxeContext::getSystem.
   std::shared_ptr<DeluxeSystem> System;
 
   /// References to all *sensors* and *agents* created by \p this object.
   std::set<AgentHandle> DeluxeUnits;
 
 public:
 
   /// Errors that may be resulted by some of the member functions of the class.
   enum struct ErrorCode {
     NoError,
     TypeMismatch,
     NotSensor,
     NotAgent,
     WrongPosition,
     AlreadyHasSlave,
     AlreadyHasMaster,
     AlreadyHasValueStream
   };
 
   /// Returns a new instance of \c rosa::deluxe::DeluxeContext.
   ///
   /// \param Name name of the underlying \c rosa::DeluxeSystem
   ///
   /// \return \c std::unique_ptr for the new instance of
   /// \c rosa::deluxe::DeluxeContext with a new, empty \c rosa::DeluxeSystem
   static std::unique_ptr<DeluxeContext>
   create(const std::string &Name) noexcept;
 
 private:
   /// Creates a new instance.
   ///
   /// \note Private constructor restricts instantiation to member functions of
   /// the class.
   ///
   /// \param Name name of the underlying \c rosa::MessagingSystem
   DeluxeContext(const std::string &Name) noexcept;
 
 public:
   /// Destroys \p this object.
   ~DeluxeContext(void) noexcept;
 
   /// Returns a reference for the underlying \c rosa::MessagingSystem.
   ///
   /// \note One cannot do much with a \c rosa::MessagingSystem currently, this
   /// is for future use.
   ///
   /// \return reference for the underlying \c rosa::MessagingSystem.
   std::weak_ptr<MessagingSystem> getSystem(void) const noexcept;
 
   /// Creates a new *sensor* in the context of \p this object.
   ///
   /// \tparam T type of data the new *sensor* operates on
   ///
   /// \param Name name of the new *sensor*
   /// \param F function for the new *sensor* to generate the next value with
   /// during normal operation
   ///
   /// \note \p F is not used during simulation, in which case
   /// \c rosa::deluxe::DeluxeContext::registerSensorValues is used to register
   /// an alternative simulation data source with
   /// \c rosa::deluxe::DeluxeSensor::registerSimulationDataSource. One may
   /// safely keep relying on the default value of \p F as long as only
   /// simulation of the system is to be done.
   ///
   /// \return \c rosa::AgentHandle for the new *sensor*
   template <typename T>
   AgentHandle createSensor(const std::string &Name,
                            DeluxeSensor::D<T> &&F = [](void) {
                              return T();
                            }) noexcept;
 
   /// Creates a new *agent* in the context of \p this object.
   ///
   /// \tparam T type of data the new *agent* outputs
   /// \tparam A type of mandatory first input the new *agent* takes
   /// \tparam As types of futher optional inputs the new *agent* takes
   ///
   /// \param Name name of the new *agent*
   /// \param F function for the new *agent* to process input values and
   /// generate output with
   ///
   /// \return \c rosa::AgentHandle for the new *agent*
   template <typename T, typename A, typename... As>
   AgentHandle createAgent(const std::string &Name,
                           DeluxeAgent::D<T, A, As...> &&F) noexcept;
 
   /// Connectes a *sensor* to an *agent* in the context of \p this object.
   ///
   /// \param Agent the *agent* to connect to
   /// \param Pos the index of slot of \p Agent to connect \p Sensor to
   /// \param Sensor the *sensor* to connect
   /// \param Description optional textual description of the connection
   ///
   /// \return how successfull connecting \p Sensor to \p Agent at slot index
   /// \p Pos was
   ///
   /// \note The function may return the following
   /// \c rosa::deluxe::DeluxeContext::ErrorCode values:
   /// `ErrorCode`        | Comment
   /// -----------        | -------
   /// `NoError`          | Success
   /// `NotAgent`         | Referred \p Agent is not \c rosa::deluxe::DeluxeAgent
   /// `NotSensor`        | Referred \p Sensor is not \c rosa::deluxe::DeluxeSensor
   /// `WrongPosition`    | \p Pos is not a valid input position of \p Agent
   /// `TypeMismatch`     | Expected input type at position \p Pos of \p Agent is other than the output type of \p Sensor
   /// `AlreadyHasSlave`  | \p Agent at position \p Pos already has a *slave* registered
   /// `AlreadyHasMaster` | \p Sensor already has a *master* registered
   ErrorCode connectSensor(AgentHandle Agent, const size_t Pos,
                           AgentHandle Sensor,
                           const std::string &Description = "") noexcept;
 
   /// Connectes two *agents* in the context of \p this object.
   ///
   /// \param Master the *agent* to connect to
   /// \param Pos the index of slot of \p Master to connect \p Slave to
   /// \param Slave the *agent* to connect
   /// \param Description optional textual description of the connection
   ///
   /// \return how succesfull connecting \p Slave to \p Master at slot index
   /// \p Pos was
   ///
   /// \note The function may return the following
   /// \c rosa::deluxe::DeluxeContext::ErrorCode values:
   /// `ErrorCode`        | Comment
   /// -----------        | -------
   /// `NoError`          | Success
   /// `NotAgent`         | Referred \p Master or \p Slave is not \c rosa::deluxe::DeluxeAgent
   /// `WrongPosition`    | \p Pos is not a valid input position of \p Master
   /// `TypeMismatch`     | Expected input type at position \p Pos of \p Master is other than the output type of \p Slave
   /// `AlreadyHasSlave`  | \p Master at position \p Pos already has a *slave* registered
   /// `AlreadyHasMaster` | \p Slave already has a *master* registered
   ErrorCode connectAgents(AgentHandle Master, const size_t Pos,
                           AgentHandle Slave,
                           const std::string &Description = "") noexcept;
 
   /// Initializes \c this object and others managed by \p this object for
   /// setting up and performing simulation.
   ///
   /// \see \c rosa::deluxe::DeluxeContext::registerSensorValues,
   /// \c rosa::deluxe::DeluxeContext::simulate
   ///
   /// Need to clear simulation data sources from all the *sensors*.
   void initializeSimulation(void) noexcept;
 
   /// Registers a stream providing values for a *sensor* during simulation.
   ///
   /// \tparam Iterator type of iterator providing values for \p Sensor
   /// \tparam T type of values \p Sensor is operating on, always use default!
   ///
   /// \param Sensor the *sensor* to register values for
   /// \param Start provides values for \p Sensor
   /// \param End denotes the end of stream of values
   /// \param Default value to be used when input stream is depleted during
   /// simulation
   ///
   /// \return how successful registering \p Source for \p Sensor
   ///
   /// \note The function may return the following
   /// \c rosa::deluxe::DeluxeContext::ErrorCode values:
   /// `ErrorCode`             | Comment
   /// -----------             | -------
   /// `NoError`               | Success
   /// `TypeMismatch`          | \p Sensor generates values of a type other than \p T
   /// `NotSensor`             | Referred \p Sensor is not \c rosa::deluxe::DeluxeSensor
   /// `AlreadyHasValueStream` | \p Sensor already has simulation data source set
   template <typename Iterator, typename T = typename Iterator::value_type>
   ErrorCode registerSensorValues(AgentHandle Sensor, Iterator &&Start,
                                  const Iterator &End, T Default = {}) noexcept;
 
   /// Performs the system contained by \p this object.
   ///
   /// The function performs \p NumCycles cycle of simulation. In each cycle,
   /// all the *agents* and *sensors* registered in
   /// \c rosa::deluxe::DeluxeContext::DeluxeUnits are trigged for execution.
   ///
   /// \param NumCycles number of cycles to perform
   ///
   /// \pre All the *sensors* in the system contained by \p this object generate
   /// their output from simulation data sources.
   void simulate(const size_t NumCycles) const noexcept;
 };
 
 template <typename T>
 AgentHandle DeluxeContext::createSensor(const std::string &Name,
                                         DeluxeSensor::D<T> &&F) noexcept {
   AgentHandle H = System->createSensor<T>(Name, std::move(F));
   DeluxeUnits.emplace(H);
   return H;
 }
 
 template <typename T, typename A, typename... As>
 AgentHandle
 DeluxeContext::createAgent(const std::string &Name,
                            DeluxeAgent::D<T, A, As...> &&F) noexcept {
   AgentHandle H = System->createAgent(Name, std::move(F));
   DeluxeUnits.emplace(H);
   return H;
 }
 
 template <typename Iterator, typename T>
 DeluxeContext::ErrorCode
 DeluxeContext::registerSensorValues(AgentHandle Sensor, Iterator &&Start,
                                     const Iterator &End, T Default) noexcept {
   // Get the type of values provided by \p Iterator.
   STATIC_ASSERT((std::is_same<T, typename Iterator::value_type>::value),
                 "type mismatch");
 
   // Make sure preconditions are met.
   if (!System->isDeluxeSensor(Sensor)) {
     DCRETERROR(ErrorCode::NotSensor);
   }
   auto S = System->getDeluxeSensor(Sensor);
   ASSERT(S); // Sanity check.
   if (S->OutputType != TypeNumberOf<T>::Value) {
     DCRETERROR(ErrorCode::TypeMismatch);
   } else if (S->simulationDataSourceIsSet()) {
     DCRETERROR(ErrorCode::AlreadyHasValueStream);
   }
 
   // Register input stream.
-  S->registerSimulationDataSource(DeluxeSensor::D<T>([&](void) noexcept {
-    if (Start != End) {
-      LOG_TRACE("Reading next value for sensor '" + S->FullName + "'");
-      return *Start++;
-    } else {
-      LOG_TRACE("Providing default value for sensor '" + S->FullName + "'");
-      return Default;
-    }
-  }));
+  // \note Need to capture parameters by value so having local copies.
+  S->registerSimulationDataSource(
+      DeluxeSensor::D<T>([=](void) mutable noexcept {
+        if (Start != End) {
+          LOG_TRACE_STREAM << "Reading next value for sensor '" << S->FullName
+                           << "': " << *Start << '\n';
+          return *Start++;
+        } else {
+          LOG_TRACE_STREAM << "Providing default value for sensor '"
+                           << S->FullName << "': " << Default << '\n';
+          return Default;
+        }
+      }));
   return ErrorCode::NoError;
 }
 
 } // End namespace deluxe
 } // End namespace rosa
 
 // Undef local macro if not used in the corresponding implementation.
 #ifndef ROSA_LIB_DELUXE_DELUXECONTEXT_CPP
 #undef DCRETERROR
 #endif
 
 #endif // ROSA_DELUXE_DELUXECONTEXT_HPP