New class for internal container pool debugging

src/debug_count.h

@@ -0,0 +1,113 @@
+///\file
+
+/******************************************************************************
+The MIT License(MIT)
+
+Embedded Template Library.
+https://github.com/ETLCPP/etl
+http://www.etlcpp.com
+
+Copyright(c) 2017 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_DEBUG_COUNT__
+#define __ETL_DEBUG_COUNT__
+
+#include <stdint.h>
+#include <assert.h>
+
+///\defgroup debug_count debug count
+///\ingroup utilities
+
+namespace etl
+{
+  //***************************************************************************
+  /// Used to count instances.
+  /// Asserts if the count is decremented below zero.
+  /// Asserts if the count is not zero when destructed.
+  /// Does nothing in a non-debug build.
+  ///\ingroup reference
+  //***************************************************************************
+  class debug_count
+  {
+  public:
+    
+#if defined(_DEBUG) || defined(DEBUG)
+    inline debug_count()
+      : count(0)
+    {
+    }
+
+    inline ~debug_count()
+    {
+      assert(count == 0);
+    }
+
+    inline debug_count& operator ++()
+    {
+      ++count;
+      return *this;
+    }
+
+    inline debug_count& operator --()
+    {
+      --count;
+      assert(count >= 0);
+      return *this;
+    }
+
+    inline operator int32_t()
+    {
+      return count;
+    }
+
+  private:
+
+    int32_t count;
+#else
+    inline debug_count()
+    {
+    }
+
+    inline ~debug_count()
+    {
+    }
+
+    inline debug_count& operator ++()
+    {
+      return *this;
+    }
+
+    inline debug_count& operator --()
+    {
+      return *this;
+    }
+
+    inline operator int32_t()
+    {
+      return 0;
+    }
+#endif
+  };
+}
+
+#endif
+