text: //
  // Copyright (c) 2008-2017 the Urho3D project. Copyright (c) 2018 the miniclib project.
  //
  // 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.
  //
  
  #pragma once
  
  #include <miniclib/miniclib.h>
  
  namespace miniclib
  {
  
  /// Reference count structure.
  struct RefCount
  {
      /// Construct.
      RefCount() :
          refs_(0),
          weakRefs_(0)
      {
      }
  
      /// Destruct.
      ~RefCount()
      {
          // Set reference counts below zero to fire asserts if this object is still accessed
          refs_ = -1;
          weakRefs_ = -1;
      }
  
      /// Reference count. If below zero, the object has been destroyed.
      int refs_;
      /// Weak reference count.
      int weakRefs_;
  };
  
  /// Base class for intrusively reference-counted objects. These are noncopyable and non-assignable.
  class MINICLIB_API RefCounted
  {
  public:
      /// Construct. Allocate the reference count structure and set an initial self weak reference.
      RefCounted();
      /// Destruct. Mark as expired and also delete the reference count structure if no outside weak references exist.
      virtual ~RefCounted();
  
      /// Increment reference count. Can also be called outside of a SharedPtr for traditional reference counting.
      void AddRef();
      /// Decrement reference count and delete self if no more references. Can also be called outside of a SharedPtr for traditional reference counting.
      void ReleaseRef();
      /// Return reference count.
      int Refs() const;
      /// Return weak reference count.
      int WeakRefs() const;
  
      /// Return pointer to the reference count structure.
      RefCount* RefCountPtr() { return refCount_; }
  
  private:
      /// Prevent copy construction.
      RefCounted(const RefCounted& rhs);
      /// Prevent assignment.
      RefCounted& operator =(const RefCounted& rhs);
  
      /// Pointer to the reference count structure.
      RefCount* refCount_;
  };
  
  }
  