Click here to Skip to main content
15,886,026 members
Search within:


Articles / Programming Languages / C++
 

Solution for Multiple enable_shared_from_this in Inheritance Tree

Rate me:
Please Sign up or sign in to vote.
4.73/5 (5 votes)
21 Nov 2011MIT5 min read 45.9K   378   9  
The initial implementation of enable_shared_from_this of STL or the one from Boost C++ causes crash if it appears more than once in the inheritance tree of a user class. This is a solution for the problem. (search tag: enable shared from this)
 
#ifndef SMARTPTRBUILDER_H_
#define SMARTPTRBUILDER_H_

#include "EnableSharedFromThis.h"
#include <memory>

namespace Generic
{

class SmartPtrBuilder
{
public:
  template< typename T0, typename T >
  static std::shared_ptr< T > CreateSharedPtr(T *iPtr);

  template< typename T0, typename T1, typename T >
  static std::shared_ptr< T > CreateSharedPtr(T *iPtr);

  template< typename T0, typename T1, typename T2, typename T >
  static std::shared_ptr< T > CreateSharedPtr(T *iPtr);

  template< typename T0, typename T1, typename T2, typename T3, typename T >
  static std::shared_ptr< T > CreateSharedPtr(T *iPtr);

  template< typename T0, typename T1, typename T2, typename T3, typename T4, typename T >
  static std::shared_ptr< T > CreateSharedPtr(T *iPtr);

  template< typename T0, typename T1, typename T2, typename T3, typename T4, typename T5, typename T >
  static std::shared_ptr< T > CreateSharedPtr(T *iPtr);

  template< typename T0, typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T >
  static std::shared_ptr< T > CreateSharedPtr(T *iPtr);

  template< typename T0, typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T >
  static std::shared_ptr< T > CreateSharedPtr(T *iPtr);

  template< typename T0, typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T8, typename T >
  static std::shared_ptr< T > CreateSharedPtr(T *iPtr);

  template< typename T0, typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T8, typename T9, typename T >
  static std::shared_ptr< T > CreateSharedPtr(T *iPtr);

  template< typename T0, typename T >
  static void AssignWeakPtr(std::shared_ptr< T > &ioSharedPtr);

  template< typename T0, typename T1, typename T >
  static void AssignWeakPtr(std::shared_ptr< T > &ioSharedPtr);

  template< typename T0, typename T1, typename T2, typename T >
  static void AssignWeakPtr(std::shared_ptr< T > &ioSharedPtr);

  template< typename T0, typename T1, typename T2, typename T3, typename T >
  static void AssignWeakPtr(std::shared_ptr< T > &ioSharedPtr);

  template< typename T0, typename T1, typename T2, typename T3, typename T4, typename T >
  static void AssignWeakPtr(std::shared_ptr< T > &ioSharedPtr);

  template< typename T0, typename T1, typename T2, typename T3, typename T4, typename T5, typename T >
  static void AssignWeakPtr(std::shared_ptr< T > &ioSharedPtr);

  template< typename T0, typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T >
  static void AssignWeakPtr(std::shared_ptr< T > &ioSharedPtr);

  template< typename T0, typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T >
  static void AssignWeakPtr(std::shared_ptr< T > &ioSharedPtr);

  template< typename T0, typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T8, typename T >
  static void AssignWeakPtr(std::shared_ptr< T > &ioSharedPtr);

  template< typename T0, typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T8, typename T9, typename T >
  static void AssignWeakPtr(std::shared_ptr< T > &ioSharedPtr);

private:
  SmartPtrBuilder();
};

template< typename T0, typename T >
inline std::shared_ptr< T > SmartPtrBuilder::CreateSharedPtr(T *iPtr)
{
  std::shared_ptr< T > wSharedPtr(iPtr);
  AssignWeakPtr< T0 >(wSharedPtr);
  return wSharedPtr;
}

template< typename T0, typename T1, typename T >
inline std::shared_ptr< T > SmartPtrBuilder::CreateSharedPtr(T *iPtr)
{
  std::shared_ptr< T > wSharedPtr(iPtr);
  AssignWeakPtr< T0, T1 >(wSharedPtr);
  return wSharedPtr;
}

template< typename T0, typename T1, typename T2, typename T >
inline std::shared_ptr< T > SmartPtrBuilder::CreateSharedPtr(T *iPtr)
{
  std::shared_ptr< T > wSharedPtr(iPtr);
  AssignWeakPtr< T0, T1, T2 >(wSharedPtr);
  return wSharedPtr;
}

template< typename T0, typename T1, typename T2, typename T3, typename T >
inline std::shared_ptr< T > SmartPtrBuilder::CreateSharedPtr(T *iPtr)
{
  std::shared_ptr< T > wSharedPtr(iPtr);
  AssignWeakPtr< T0, T1, T2, T3 >(wSharedPtr);
  return wSharedPtr;
}

template< typename T0, typename T1, typename T2, typename T3, typename T4, typename T >
inline std::shared_ptr< T > SmartPtrBuilder::CreateSharedPtr(T *iPtr)
{
  std::shared_ptr< T > wSharedPtr(iPtr);
  AssignWeakPtr< T0, T1, T2, T3, T4 >(wSharedPtr);
  return wSharedPtr;
}

template< typename T0, typename T1, typename T2, typename T3, typename T4, typename T5, typename T >
inline std::shared_ptr< T > SmartPtrBuilder::CreateSharedPtr(T *iPtr)
{
  std::shared_ptr< T > wSharedPtr(iPtr);
  AssignWeakPtr< T0, T1, T2, T3, T4, T5 >(wSharedPtr);
  return wSharedPtr;
}

template< typename T0, typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T >
inline std::shared_ptr< T > SmartPtrBuilder::CreateSharedPtr(T *iPtr)
{
  std::shared_ptr< T > wSharedPtr(iPtr);
  AssignWeakPtr< T0, T1, T2, T3, T4, T5, T6 >(wSharedPtr);
  return wSharedPtr;
}

template< typename T0, typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T >
inline std::shared_ptr< T > SmartPtrBuilder::CreateSharedPtr(T *iPtr)
{
  std::shared_ptr< T > wSharedPtr(iPtr);
  AssignWeakPtr< T0, T1, T2, T3, T4, T5, T6, T7 >(wSharedPtr);
  return wSharedPtr;
}

template< typename T0, typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T8, typename T >
inline std::shared_ptr< T > SmartPtrBuilder::CreateSharedPtr(T *iPtr)
{
  std::shared_ptr< T > wSharedPtr(iPtr);
  AssignWeakPtr< T0, T1, T2, T3, T4, T5, T6, T7, T8 >(wSharedPtr);
  return wSharedPtr;
}

template< typename T0, typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T8, typename T9, typename T >
inline std::shared_ptr< T > SmartPtrBuilder::CreateSharedPtr(T *iPtr)
{
  std::shared_ptr< T > wSharedPtr(iPtr);
  AssignWeakPtr< T0, T1, T2, T3, T4, T5, T6, T7, T8, T9 >(wSharedPtr);
  return wSharedPtr;
}

template< typename T0, typename T >
inline void SmartPtrBuilder::AssignWeakPtr(std::shared_ptr< T > &ioSharedPtr)
{
  ioSharedPtr->EnableSharedFromThis< T0 >::SetWeakPtr(ioSharedPtr, ioSharedPtr.get());
}

template< typename T0, typename T1, typename T >
inline void SmartPtrBuilder::AssignWeakPtr(std::shared_ptr< T > &ioSharedPtr)
{
  ioSharedPtr->EnableSharedFromThis< T0 >::SetWeakPtr(ioSharedPtr, ioSharedPtr.get());
  ioSharedPtr->EnableSharedFromThis< T1 >::SetWeakPtr(ioSharedPtr, ioSharedPtr.get());
}

template< typename T0, typename T1, typename T2, typename T >
inline void SmartPtrBuilder::AssignWeakPtr(std::shared_ptr< T > &ioSharedPtr)
{
  ioSharedPtr->EnableSharedFromThis< T0 >::SetWeakPtr(ioSharedPtr, ioSharedPtr.get());
  ioSharedPtr->EnableSharedFromThis< T1 >::SetWeakPtr(ioSharedPtr, ioSharedPtr.get());
  ioSharedPtr->EnableSharedFromThis< T2 >::SetWeakPtr(ioSharedPtr, ioSharedPtr.get());
}

template< typename T0, typename T1, typename T2, typename T3, typename T >
inline void SmartPtrBuilder::AssignWeakPtr(std::shared_ptr< T > &ioSharedPtr)
{
  ioSharedPtr->EnableSharedFromThis< T0 >::SetWeakPtr(ioSharedPtr, ioSharedPtr.get());
  ioSharedPtr->EnableSharedFromThis< T1 >::SetWeakPtr(ioSharedPtr, ioSharedPtr.get());
  ioSharedPtr->EnableSharedFromThis< T2 >::SetWeakPtr(ioSharedPtr, ioSharedPtr.get());
  ioSharedPtr->EnableSharedFromThis< T3 >::SetWeakPtr(ioSharedPtr, ioSharedPtr.get());
}

template< typename T0, typename T1, typename T2, typename T3, typename T4, typename T >
inline void SmartPtrBuilder::AssignWeakPtr(std::shared_ptr< T > &ioSharedPtr)
{
  ioSharedPtr->EnableSharedFromThis< T0 >::SetWeakPtr(ioSharedPtr, ioSharedPtr.get());
  ioSharedPtr->EnableSharedFromThis< T1 >::SetWeakPtr(ioSharedPtr, ioSharedPtr.get());
  ioSharedPtr->EnableSharedFromThis< T2 >::SetWeakPtr(ioSharedPtr, ioSharedPtr.get());
  ioSharedPtr->EnableSharedFromThis< T3 >::SetWeakPtr(ioSharedPtr, ioSharedPtr.get());
  ioSharedPtr->EnableSharedFromThis< T4 >::SetWeakPtr(ioSharedPtr, ioSharedPtr.get());
}

template< typename T0, typename T1, typename T2, typename T3, typename T4, typename T5, typename T >
inline void SmartPtrBuilder::AssignWeakPtr(std::shared_ptr< T > &ioSharedPtr)
{
  ioSharedPtr->EnableSharedFromThis< T0 >::SetWeakPtr(ioSharedPtr, ioSharedPtr.get());
  ioSharedPtr->EnableSharedFromThis< T1 >::SetWeakPtr(ioSharedPtr, ioSharedPtr.get());
  ioSharedPtr->EnableSharedFromThis< T2 >::SetWeakPtr(ioSharedPtr, ioSharedPtr.get());
  ioSharedPtr->EnableSharedFromThis< T3 >::SetWeakPtr(ioSharedPtr, ioSharedPtr.get());
  ioSharedPtr->EnableSharedFromThis< T4 >::SetWeakPtr(ioSharedPtr, ioSharedPtr.get());
  ioSharedPtr->EnableSharedFromThis< T5 >::SetWeakPtr(ioSharedPtr, ioSharedPtr.get());
}

template< typename T0, typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T >
inline void SmartPtrBuilder::AssignWeakPtr(std::shared_ptr< T > &ioSharedPtr)
{
  ioSharedPtr->EnableSharedFromThis< T0 >::SetWeakPtr(ioSharedPtr, ioSharedPtr.get());
  ioSharedPtr->EnableSharedFromThis< T1 >::SetWeakPtr(ioSharedPtr, ioSharedPtr.get());
  ioSharedPtr->EnableSharedFromThis< T2 >::SetWeakPtr(ioSharedPtr, ioSharedPtr.get());
  ioSharedPtr->EnableSharedFromThis< T3 >::SetWeakPtr(ioSharedPtr, ioSharedPtr.get());
  ioSharedPtr->EnableSharedFromThis< T4 >::SetWeakPtr(ioSharedPtr, ioSharedPtr.get());
  ioSharedPtr->EnableSharedFromThis< T5 >::SetWeakPtr(ioSharedPtr, ioSharedPtr.get());
  ioSharedPtr->EnableSharedFromThis< T6 >::SetWeakPtr(ioSharedPtr, ioSharedPtr.get());
}

template< typename T0, typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T >
inline void SmartPtrBuilder::AssignWeakPtr(std::shared_ptr< T > &ioSharedPtr)
{
  ioSharedPtr->EnableSharedFromThis< T0 >::SetWeakPtr(ioSharedPtr, ioSharedPtr.get());
  ioSharedPtr->EnableSharedFromThis< T1 >::SetWeakPtr(ioSharedPtr, ioSharedPtr.get());
  ioSharedPtr->EnableSharedFromThis< T2 >::SetWeakPtr(ioSharedPtr, ioSharedPtr.get());
  ioSharedPtr->EnableSharedFromThis< T3 >::SetWeakPtr(ioSharedPtr, ioSharedPtr.get());
  ioSharedPtr->EnableSharedFromThis< T4 >::SetWeakPtr(ioSharedPtr, ioSharedPtr.get());
  ioSharedPtr->EnableSharedFromThis< T5 >::SetWeakPtr(ioSharedPtr, ioSharedPtr.get());
  ioSharedPtr->EnableSharedFromThis< T6 >::SetWeakPtr(ioSharedPtr, ioSharedPtr.get());
  ioSharedPtr->EnableSharedFromThis< T7 >::SetWeakPtr(ioSharedPtr, ioSharedPtr.get());
}

template< typename T0, typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T8, typename T >
inline void SmartPtrBuilder::AssignWeakPtr(std::shared_ptr< T > &ioSharedPtr)
{
  ioSharedPtr->EnableSharedFromThis< T0 >::SetWeakPtr(ioSharedPtr, ioSharedPtr.get());
  ioSharedPtr->EnableSharedFromThis< T1 >::SetWeakPtr(ioSharedPtr, ioSharedPtr.get());
  ioSharedPtr->EnableSharedFromThis< T2 >::SetWeakPtr(ioSharedPtr, ioSharedPtr.get());
  ioSharedPtr->EnableSharedFromThis< T3 >::SetWeakPtr(ioSharedPtr, ioSharedPtr.get());
  ioSharedPtr->EnableSharedFromThis< T4 >::SetWeakPtr(ioSharedPtr, ioSharedPtr.get());
  ioSharedPtr->EnableSharedFromThis< T5 >::SetWeakPtr(ioSharedPtr, ioSharedPtr.get());
  ioSharedPtr->EnableSharedFromThis< T6 >::SetWeakPtr(ioSharedPtr, ioSharedPtr.get());
  ioSharedPtr->EnableSharedFromThis< T7 >::SetWeakPtr(ioSharedPtr, ioSharedPtr.get());
  ioSharedPtr->EnableSharedFromThis< T8 >::SetWeakPtr(ioSharedPtr, ioSharedPtr.get());
}

template< typename T0, typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T8, typename T9, typename T >
inline void SmartPtrBuilder::AssignWeakPtr(std::shared_ptr< T > &ioSharedPtr)
{
  ioSharedPtr->EnableSharedFromThis< T0 >::SetWeakPtr(ioSharedPtr, ioSharedPtr.get());
  ioSharedPtr->EnableSharedFromThis< T1 >::SetWeakPtr(ioSharedPtr, ioSharedPtr.get());
  ioSharedPtr->EnableSharedFromThis< T2 >::SetWeakPtr(ioSharedPtr, ioSharedPtr.get());
  ioSharedPtr->EnableSharedFromThis< T3 >::SetWeakPtr(ioSharedPtr, ioSharedPtr.get());
  ioSharedPtr->EnableSharedFromThis< T4 >::SetWeakPtr(ioSharedPtr, ioSharedPtr.get());
  ioSharedPtr->EnableSharedFromThis< T5 >::SetWeakPtr(ioSharedPtr, ioSharedPtr.get());
  ioSharedPtr->EnableSharedFromThis< T6 >::SetWeakPtr(ioSharedPtr, ioSharedPtr.get());
  ioSharedPtr->EnableSharedFromThis< T7 >::SetWeakPtr(ioSharedPtr, ioSharedPtr.get());
  ioSharedPtr->EnableSharedFromThis< T9 >::SetWeakPtr(ioSharedPtr, ioSharedPtr.get());
}

}

#endif /* SMARTPTRBUILDER_H_ */

// Copyright (C) 2011 by Philippe Cayouette
     
// 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.

By viewing downloads associated with this article you agree to the Terms of Service and the article's licence.

If a file you wish to view isn't highlighted, and is a text file (not binary), please let us know and we'll add colourisation support for it.

License

This article, along with any associated source code and files, is licensed under The MIT License


Written By
Philippe Cayouette
Software Developer (Senior) CAE Inc.
Canada Canada
This member has not yet provided a Biography. Assume it's interesting and varied, and probably something to do with programming.

Comments and Discussions

Permalink
Advertise
Privacy
Cookies
Terms of Use
Layout: fixed | fluid

Posted 21 Nov 2011

Article Copyright 2011 by Philippe Cayouette
Everything else Copyright © CodeProject, 1999-2024

Web02 2.8:2024-04-02:1