Counter type for intrusive containers.

Specializations for slow and fast count types.

src/private/counter_type.h

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+///\file
+
+/******************************************************************************
+The MIT License(MIT)
+
+Embedded Template Library.
+https://github.com/ETLCPP/etl
+http://www.etlcpp.com
+
+Copyright(c) 2016 jwellbelove
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files(the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and / or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions :
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+******************************************************************************/
+
+#ifndef __ETL_COUNTER_TYPE__
+#define __ETL_COUNTER_TYPE__
+
+#include <stddef.h>
+
+#include "../intrusive_links.h"
+
+namespace etl
+{
+  //*************************************************************************
+  /// Counter type based on intrusive link count option.
+  //*************************************************************************
+  template <const size_t OPTION>
+  class counter_type
+  {
+  };
+
+  //*************************************************************************
+  /// Slow type.
+  //*************************************************************************
+  template <>
+  class counter_type<etl::count_option::SLOW_COUNT>
+  {
+  public:
+
+    counter_type& operator ++()
+    {
+      return *this;
+    }
+
+    counter_type& operator --()
+    {
+      return *this;
+    }
+
+    counter_type& operator =(size_t new_count)
+    {
+      return *this;
+    }
+
+    counter_type& operator +=(size_t diff)
+    {
+      return *this;
+    }
+
+    counter_type& operator -=(size_t diff)
+    {
+      return *this;
+    }
+
+    size_t get_count() const
+    {
+      return 0;
+    }
+  };
+
+  //*************************************************************************
+  /// Fast type.
+  //*************************************************************************
+  template <>
+  class counter_type<etl::count_option::FAST_COUNT>
+  {
+  public:
+
+    counter_type()
+      : count(0)
+    {
+    }
+
+    counter_type& operator ++()
+    {
+      ++count;
+      return *this;
+    }
+
+    counter_type& operator --()
+    {
+      --count;
+      return *this;
+    }
+
+    counter_type& operator =(size_t new_count)
+    {
+      count = new_count;
+      return *this;
+    }
+
+    counter_type& operator +=(size_t diff)
+    {
+      count += diff;
+      return *this;
+    }
+
+    counter_type& operator -=(size_t diff)
+    {
+      count -= diff;
+      return *this;
+    }
+
+    size_t get_count() const
+    {
+      return count;
+    }
+
+    size_t count;
+  };
+}
+
+#endif