AutoPointer.h

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//     ____   ______ __
//    / __ \ / ____// /
//   / /_/ // /    / /
//  / ____// /___ / /___   PixInsight Class Library
// /_/     \____//_____/   PCL 2.4.7
// ----------------------------------------------------------------------------
// pcl/AutoPointer.h - Released 2020-12-17T15:46:29Z
// ----------------------------------------------------------------------------
// This file is part of the PixInsight Class Library (PCL).
// PCL is a multiplatform C++ framework for development of PixInsight modules.
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// ----------------------------------------------------------------------------

#ifndef __PCL_AutoPointer_h
#define __PCL_AutoPointer_h


#include <pcl/Defs.h>
#include <pcl/Diagnostics.h>

#include <pcl/Utility.h>

namespace pcl
{

// ----------------------------------------------------------------------------

template <typename T>
class PCL_CLASS StandardDeleter
{
public:

   typedef T         value_type;

   typedef T*        pointer;

   void operator()( pointer p ) const
   {
      PCL_PRECONDITION( p != nullptr )
      delete p;
   }
};

// ----------------------------------------------------------------------------

template <class T, class D = StandardDeleter<T> >
class PCL_CLASS AutoPointer
{
public:

   typedef T         value_type;

   typedef T*        pointer;

   typedef const T*  const_pointer;

   typedef D         deleter;

   AutoPointer( bool autoDelete = true, const deleter& d = deleter() )
      : m_deleter( d )
      , m_autoDelete( autoDelete )
   {
   }

   AutoPointer( pointer p, bool autoDelete = true, const deleter& d = deleter() )
      : m_deleter( d )
      , m_autoDelete( autoDelete )
   {
      m_pointer = p;
   }

   AutoPointer( AutoPointer& x )
      : m_deleter( x.m_deleter )
      , m_autoDelete( x.m_autoDelete )
   {
      m_pointer = x.Release();
   }

   AutoPointer( AutoPointer&& x )
      : m_deleter( std::move( x.m_deleter ) )
      , m_autoDelete( x.m_autoDelete )
   {
      m_pointer = x.Release();
   }

   virtual ~AutoPointer()
   {
      Reset();
   }

   void SetPointer( pointer p )
   {
      if ( m_pointer != p )
      {
         if ( m_autoDelete )
            if ( m_pointer != nullptr )
               m_deleter( Release() ); // in case m_deleter throws
         m_pointer = p;
      }
   }

   void Reset()
   {
      if ( m_pointer != nullptr )
      {
         pointer p = Release(); // in case m_deleter throws
         if ( m_autoDelete )
            m_deleter( p );
      }
   }

   void Destroy()
   {
      Reset();
   }

   pointer Release()
   {
      pointer p = m_pointer;
      m_pointer = nullptr;
      return p;
   }

   const_pointer Pointer() const
   {
      return m_pointer;
   }

   pointer Pointer()
   {
      return m_pointer;
   }

   const_pointer Ptr() const
   {
      return m_pointer;
   }

   pointer Ptr()
   {
      return m_pointer;
   }

   bool IsNull() const
   {
      return m_pointer == nullptr;
   }

   bool IsValid() const
   {
      return !IsNull();
   }

   bool IsAutoDelete() const
   {
      return m_autoDelete;
   }

   void EnableAutoDelete( bool enable = true )
   {
      m_autoDelete = enable;
   }

   void DisableAutoDelete( bool disable = true )
   {
      EnableAutoDelete( !disable );
   }

   const deleter& Deleter() const
   {
      return m_deleter;
   }

   deleter& Deleter()
   {
      return m_deleter;
   }

   AutoPointer& operator =( AutoPointer& x )
   {
      SetPointer( x.Release() );
      m_deleter = x.m_deleter;
      m_autoDelete = x.m_autoDelete;
      return *this;
   }

   AutoPointer& operator =( AutoPointer&& x )
   {
      SetPointer( x.Release() );
      m_deleter = std::move( x.m_deleter );
      m_autoDelete = x.m_autoDelete;
      return *this;
   }

   AutoPointer& operator =( pointer p )
   {
      SetPointer( p );
      return *this;
   }

   operator const_pointer() const
   {
      return m_pointer;
   }

   operator pointer()
   {
      return m_pointer;
   }

   const_pointer operator ->() const
   {
      PCL_PRECONDITION( m_pointer != nullptr )
      return m_pointer;
   }

   pointer operator ->()
   {
      PCL_PRECONDITION( m_pointer != nullptr )
      return m_pointer;
   }

   const value_type& operator *() const
   {
      PCL_PRECONDITION( m_pointer != nullptr )
      return *m_pointer;
   }

   value_type& operator *()
   {
      PCL_PRECONDITION( m_pointer != nullptr )
      return *m_pointer;
   }

   operator bool() const
   {
      return !IsNull();
   }

   friend void Swap( AutoPointer& x1, AutoPointer& x2 )
   {
      pcl::Swap( x1.m_pointer, x2.m_pointer );
      pcl::Swap( x1.m_deleter, x2.m_deleter );
      bool b = x1.m_autoDelete; x1.m_autoDelete = x2.m_autoDelete; x2.m_autoDelete = b;
   }

protected:

   pointer m_pointer = nullptr;
   deleter m_deleter;
   bool    m_autoDelete = true;
};

// ----------------------------------------------------------------------------

#define ASSERT_COPIABLE_T() \
   static_assert( std::is_copy_constructible<T>::value, "AutoPointerCloner<> requires a copy-constructible type." )

template <class T, class D = StandardDeleter<T> >
class PCL_CLASS AutoPointerCloner : public AutoPointer<T,D>
{
public:

   typedef AutoPointer<T,D>                  base_type;

   typedef typename base_type::value_type    value_type;

   typedef typename base_type::pointer       pointer;

   typedef typename base_type::const_pointer const_pointer;

   typedef typename base_type::deleter       deleter;

   AutoPointerCloner( bool autoDelete = true, const deleter& d = deleter() )
      : base_type( autoDelete, d )
   {
      ASSERT_COPIABLE_T();
   }

   AutoPointerCloner( pointer p, bool autoDelete = true, const deleter& d = deleter() )
      : base_type( p, autoDelete, d )
   {
      ASSERT_COPIABLE_T();
   }

   AutoPointerCloner( const base_type& x )
      : base_type( nullptr )
   {
      ASSERT_COPIABLE_T();
      this->m_pointer = x ? new value_type( *x ) : nullptr;
      this->m_deleter = x.m_deleter;
      this->m_autoDelete = x || x.m_autoDelete;
   }

   AutoPointerCloner( const AutoPointerCloner& x )
      : base_type( nullptr )
   {
      ASSERT_COPIABLE_T();
      this->m_pointer = x ? new value_type( *x ) : nullptr;
      this->m_deleter = x.m_deleter;
      this->m_autoDelete = x || x.m_autoDelete;
   }

   AutoPointerCloner( base_type&& x )
      : base_type( std::move( x ) )
   {
   }

   AutoPointerCloner& operator =( const base_type& x )
   {
      this->SetPointer( x ? new value_type( *x ) : nullptr );
      this->m_deleter = x.m_deleter;
      this->m_autoDelete = x || x.m_autoDelete;
      return *this;
   }

   AutoPointerCloner& operator =( const AutoPointerCloner& x )
   {
      this->SetPointer( x ? new value_type( *x ) : nullptr );
      this->m_deleter = x.m_deleter;
      this->m_autoDelete = x || x.m_autoDelete;
      return *this;
   }

   AutoPointerCloner& operator =( base_type&& x )
   {
      (void)base_type::operator =( std::move( x ) );
      return *this;
   }

   AutoPointerCloner& operator =( pointer p )
   {
      this->SetPointer( p );
      return *this;
   }
};

#undef ASSERT_COPIABLE_T

// ----------------------------------------------------------------------------

} // pcl

#endif  // __PCL_AutoPointer_h

// ----------------------------------------------------------------------------
// EOF pcl/AutoPointer.h - Released 2020-12-17T15:46:29Z