Add support for in-place instantiation of a shared message in the mes…

…sage pool

include/etl/reference_counted_message.h

@@ -72,9 +72,12 @@ namespace etl
     //***************************************************************************
     /// Constructor
     /// \param owner The message owner.
+    /// \param args  The constructor arguments.
     //***************************************************************************
-    reference_counted_message(etl::ireference_counted_message_pool& owner_)
-      : owner(owner_)
+    template <typename... Args>
+    reference_counted_message(etl::ireference_counted_message_pool& owner_, Args&&... args)
+      : rc_object(etl::forward<Args>(args)...)
+      , owner(owner_)
     {
     }
 

include/etl/reference_counted_message_pool.h

@@ -100,6 +100,33 @@ namespace etl
     {
     }
 
+    //*************************************************************************
+    /// Allocate a reference counted message from the pool.
+    //*************************************************************************
+    template <typename TMessage, typename... Args>
+    etl::reference_counted_message<TMessage, TCounter>* allocate(const TMessage*, Args&&... args)
+    {
+      ETL_STATIC_ASSERT((etl::is_base_of<etl::imessage, TMessage>::value), "Not a message type");
+
+      typedef etl::reference_counted_message<TMessage, TCounter> rcm_t;
+      typedef rcm_t* prcm_t;
+
+      prcm_t p = ETL_NULLPTR;
+
+      lock();
+      p = static_cast<prcm_t>(memory_block_allocator.allocate(sizeof(rcm_t), etl::alignment_of<rcm_t>::value));
+      unlock();
+
+      if (p != ETL_NULLPTR)
+      {
+        ::new(p) rcm_t(*this, etl::forward<Args>(args)...);
+      }
+
+      ETL_ASSERT((p != ETL_NULLPTR), ETL_ERROR(etl::reference_counted_message_pool_allocation_failure));
+
+      return p;
+    }
+
     //*************************************************************************
     /// Allocate a reference counted message from the pool.
     //*************************************************************************

include/etl/reference_counted_object.h

@@ -223,6 +223,15 @@ namespace etl
     {
     }
 
+    //***************************************************************************
+    /// Constructor.
+    //***************************************************************************
+    template <typename... Args>
+    reference_counted_object(Args&&... args)
+      : object(etl::forward<Args>(args)...)
+    {
+    }
+
     //***************************************************************************
     /// Get a reference to the counted object.
     //***************************************************************************

include/etl/shared_message.h

@@ -49,6 +49,16 @@ namespace etl
   {
   public:
 
+    //*************************************************************************
+    /// Creator for in-place instantiation
+    //*************************************************************************
+    template <typename TMessage, typename TPool, typename... Args>
+    static shared_message create(TPool& owner, Args&&... args)
+    {
+      const TMessage* msg = nullptr;
+      return shared_message(owner, msg, etl::forward<Args>(args)...);
+    }
+
     //*************************************************************************
     /// Constructor
     //*************************************************************************
@@ -59,7 +69,24 @@ namespace etl
       ETL_STATIC_ASSERT((etl::is_base_of<etl::imessage, TMessage>::value), "TMessage not derived from etl::imessage");
 
       p_rcmessage = owner.allocate(message);
-
+
+      if (p_rcmessage != ETL_NULLPTR)
+      {
+        p_rcmessage->get_reference_counter().set_reference_count(1U);
+      }
+    }
+
+    //*************************************************************************
+    /// Constructor
+    //*************************************************************************
+    template <typename TPool, typename TMessage, typename... Args>
+    shared_message(TPool& owner, const TMessage* message, Args&&... args)
+    {
+      ETL_STATIC_ASSERT((etl::is_base_of<etl::ireference_counted_message_pool, TPool>::value), "TPool not derived from etl::ireference_counted_message_pool");
+      ETL_STATIC_ASSERT((etl::is_base_of<etl::imessage, TMessage>::value), "TMessage not derived from etl::imessage");
+
+      p_rcmessage = owner.allocate(message, etl::forward<Args>(args)...);
+
       if (p_rcmessage != ETL_NULLPTR)
       {
         p_rcmessage->get_reference_counter().set_reference_count(1U);

test/test_shared_message.cpp

@@ -44,20 +44,41 @@ namespace
   constexpr etl::message_router_id_t RouterId1 = 1U;
   constexpr etl::message_router_id_t RouterId2 = 2U;
 
+  int_least_8_t message_1_instantiations = 0;
+
   //*************************************************************************
   struct Message1 : public etl::message<MessageId1>
   {
+    Message1()
+      : i(0)
+    {
+      ++message_1_instantiations;
+    }
+
     Message1(int i_)
       : i(i_)
     {
+      ++message_1_instantiations;
+    }
+
+    Message1(const Message1& msg)
+    : i(msg.i)
+    {
+      ++message_1_instantiations;
+    }
+
+    Message1(Message1&& msg)
+    : i(msg.i)
+    {
+      ++message_1_instantiations;
     }
 
     ~Message1()
     {
 
     }
 
-    int i;
+    int_least_8_t i;
   };
 
   //*************************************************************************
@@ -157,7 +178,22 @@ namespace
                                             pool_message_parameters::max_alignment,
                                             4U> memory_allocator;
 
-    etl::atomic_counted_message_pool message_pool(memory_allocator);
+    class atomic_counted_message_factory : public etl::atomic_counted_message_pool
+    {
+      public:
+        atomic_counted_message_factory(etl::imemory_block_allocator& memory_block_allocator_)
+          : etl::atomic_counted_message_pool(memory_block_allocator_)
+        {
+        }
+
+        template <typename TMessage, typename... Args>
+        etl::shared_message create_message(Args&&... args)
+        {
+          return etl::shared_message::create<TMessage>(*this, etl::forward<Args>(args)...);
+        }
+    };
+
+    atomic_counted_message_factory message_pool(memory_allocator);
 
     //*************************************************************************
     class Message2Allocator : public etl::ireference_counted_message_pool
@@ -180,12 +216,49 @@ namespace
     };
 
     //*************************************************************************
-    TEST(test_move_constructor)
+    TEST(test_move_constructor_with_default_constructed_message)
     {
 #include "etl/private/diagnostic_pessimizing_move_push.h"
-      etl::shared_message sm1(std::move(etl::shared_message(message_pool, Message1(1))));
+      etl::shared_message sm(std::move(etl::shared_message(message_pool, Message1())));
 #include "etl/private/diagnostic_pop.h"
-      CHECK_EQUAL(1, sm1.get_reference_count());
+
+      CHECK_EQUAL(1, sm.get_reference_count());
+    }
+
+    //*************************************************************************
+    TEST(test_move_constructor_with_default_constructed_message_inplace_in_message_pool)
+    {
+      message_1_instantiations = 0;
+
+#include "etl/private/diagnostic_pessimizing_move_push.h"
+      etl::shared_message sm (std::move(message_pool.create_message<Message1>()));
+#include "etl/private/diagnostic_pop.h"
+
+      CHECK_EQUAL(1, sm.get_reference_count());
+      CHECK_EQUAL(1, message_1_instantiations);
+    }
+
+    //*************************************************************************
+    TEST(test_move_constructor_with_parametrized_constructed_message)
+    {
+#include "etl/private/diagnostic_pessimizing_move_push.h"
+      etl::shared_message sm(std::move(etl::shared_message(message_pool, Message1(1))));
+#include "etl/private/diagnostic_pop.h"
+
+      CHECK_EQUAL(1, sm.get_reference_count());
+    }
+
+    //*************************************************************************
+    TEST(test_move_constructor_with_parametrized_constructed_message_inplace_in_message_pool)
+    {
+      message_1_instantiations = 0;
+
+#include "etl/private/diagnostic_pessimizing_move_push.h"
+      etl::shared_message sm (std::move(message_pool.create_message<Message1>(1)));
+#include "etl/private/diagnostic_pop.h"
+
+      CHECK_EQUAL(1, sm.get_reference_count());
+      CHECK_EQUAL(1, message_1_instantiations);
     }
 
     //*************************************************************************