Discussion :

[Darktib]

Bonjour,

J'ai très récemment téléchargé Boost pour tester, on ne m'en disais que du bien. Après un petit tour dans la doc, et donc après avoir vu des choses plutot impressionnantes, je me suis mis à réécrire un projet C++ avec des conteneurs intrusifs (le projet était avant avec std::list).

Et il se trouve que ca ne compile pas...

Le code:

Code :

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    class EqualRefSystem : public boost::intrusive::list_base_hook< boost::intrusive::link_mode<boost::intrusive::normal_link> >
 
    {
 
        public:
 
            //! Constructor
 
            EqualRefSystem()
 
            :Target(0),RefCount(0) {}
 
 
 
            //! Destructor
 
            /** Safe destructor : all references and target are reseted. **/
 
            virtual ~EqualRefSystem()
 
            {
 
                resetTarget();
 
                unlink();
 
            }
 
 
 
            //! Returns the targeted object
 
            /** \return A pointer to the object targeted by this EqualRefSystem. **/
 
            EqualRefSystem* getTarget() const
 
            { return Target; }
 
 
 
            //! Sets the target
 
            /** \param tgt : The new target. 0 means 'no target'. If tgt == this, the target is set to 0. **/
 
            void setTarget(EqualRefSystem* tgt)
 
            {
 
                if(tgt == Target) return;
 
                if(tgt == this) tgt = 0;
 
                if(Target) Target->dereference(this);
 
                Target = tgt;
 
                if(Target) Target->reference(this);
 
            }
 
 
 
            //! Resets the target
 
            /** This function is a synonym for setTarget(0). **/
 
            void resetTarget()
 
            {
 
                if(Target) Target->dereference(this);
 
                Target = 0;
 
            }
 
 
 
            //! Returns whether a target is set or not
 
            /** This function is a synonym for (getTarget() != 0).
 
                \return True if a target is set, else false. **/
 
            bool hasTarget() const
 
            { return Target != 0; }
 
 
 
            //! Unlink from all objects which targets this one
 
            /** This function resets the target of all objects targeting this EqualRefSystem. **/
 
            void unlink()
 
            {
 
                while(!ReferencedBy.empty()) ReferencedBy.begin()->resetTarget();
 
                RefCount = 0;
 
            }
 
 
 
            //! Returns the number of objects targeting this one
 
            /** \return The number of objects targeting this EqualRefSystem. Constant-time. **/
 
            unsigned int getNumberOfReferences() const
 
            { return RefCount; }
 
 
 
        private:
 
            //! Reference an object in this EqualRefSystem
 
            void reference(const EqualRefSystem* toRef)
 
            {
 
                if(!toRef || toRef == this) return;
 
                ReferencedBy.push_back(*toRef);
 
                RefCount++;
 
            }
 
 
 
            //! Dereference an object from this EqualRefSystem
 
            void dereference(const EqualRefSystem* toDeref)
 
            {
 
                if(!toDeref || toDeref == this) return;
 
                ReferencedBy.erase(ReferencedBy.iterator_to(*toDeref));
 
                RefCount--;
 
            }
 
 
 
            //! Targeted object
 
            EqualRefSystem* Target;
 
 
 
            //! Objects that reference this EqualRefSystem
 
            boost::intrusive::list<EqualRefSystem,
 
                    boost::intrusive::list_base_hook< boost::intrusive::link_mode<boost::intrusive::normal_link> >,
 
                    boost::intrusive::constant_time_size<false> > ReferencedBy;
 
 
 
            //! Number of references
 
            unsigned int RefCount;
 
    };

MinGW GCC 4.4.0 me sort:

-------------- Build: Debug in equalrefsystem ---------------



Compiling: main.cpp

In file included from D:\Boost/boost/intrusive/list_hook.hpp:22,

from D:\Boost/boost/intrusive/list.hpp:20,

from D:\ReferenceSystem\equalrefsystem\/src\EqualRefSystem.h:3,

from D:\ReferenceSystem\equalrefsystem\main.cpp:5:

D:\Boost/boost/intrusive/options.hpp: In instantiation of 'boost::intrusive::do_pack<boost::intrusive::list_defaults<base::EqualRefSystem>, boost::intrusive::list_base_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0u>, boost::intrusive::none, boost::intrusive::none> >':

D:\Boost/boost/intrusive/options.hpp:639: instantiated from 'boost::intrusive::pack_options<boost::intrusive::list_defaults<base::EqualRefSystem>, boost::intrusive::list_base_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0u>, boost::intrusive::none, boost::intrusive::none>, boost::intrusive::constant_time_size<false>, boost::intrusive::none, boost::intrusive::none, boost::intrusive::none, boost::intrusive::none, boost::intrusive::none, boost::intrusive::none, boost::intrusive::none, boost::intrusive::none, boost::intrusive::none>'

D:\Boost/boost/intrusive/list.hpp:1414: instantiated from 'boost::intrusive::make_list<base::EqualRefSystem, boost::intrusive::list_base_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0u>, boost::intrusive::none, boost::intrusive::none>, boost::intrusive::constant_time_size<false>, boost::intrusive::none>'

D:\Boost/boost/intrusive/list.hpp:1447: instantiated from 'boost::intrusive::list<base::EqualRefSystem, boost::intrusive::list_base_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0u>, boost::intrusive::none, boost::intrusive::none>, boost::intrusive::constant_time_size<false>, boost::intrusive::none>'

D:\ReferenceSystem\equalrefsystem\/src\EqualRefSystem.h:106: instantiated from here

D:\Boost/boost/intrusive/options.hpp:577: error: no class template named 'pack' in 'class boost::intrusive::list_base_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0u>, boost::intrusive::none, boost::intrusive::none>'

In file included from D:\ReferenceSystem\equalrefsystem\main.cpp:5:

D:\ReferenceSystem\equalrefsystem\/src\EqualRefSystem.h: In member function 'void base::EqualRefSystem::unlink()':

D:\ReferenceSystem\equalrefsystem\/src\EqualRefSystem.h:74: error: 'class boost::intrusive::list<base::EqualRefSystem, boost::intrusive::list_base_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0u>, boost::intrusive::none, boost::intrusive::none>, boost::intrusive::constant_time_size<false>, boost::intrusive::none>' has no member named 'empty'

D:\ReferenceSystem\equalrefsystem\/src\EqualRefSystem.h:74: error: 'class boost::intrusive::list<base::EqualRefSystem, boost::intrusive::list_base_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0u>, boost::intrusive::none, boost::intrusive::none>, boost::intrusive::constant_time_size<false>, boost::intrusive::none>' has no member named 'begin'

D:\ReferenceSystem\equalrefsystem\/src\EqualRefSystem.h: In member function 'void base::EqualRefSystem::reference(const base::EqualRefSystem*)':

D:\ReferenceSystem\equalrefsystem\/src\EqualRefSystem.h:88: error: 'class boost::intrusive::list<base::EqualRefSystem, boost::intrusive::list_base_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0u>, boost::intrusive::none, boost::intrusive::none>, boost::intrusive::constant_time_size<false>, boost::intrusive::none>' has no member named 'push_back'

D:\ReferenceSystem\equalrefsystem\/src\EqualRefSystem.h: In member function 'void base::EqualRefSystem::dereference(const base::EqualRefSystem*)':

D:\ReferenceSystem\equalrefsystem\/src\EqualRefSystem.h:96: error: 'class boost::intrusive::list<base::EqualRefSystem, boost::intrusive::list_base_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0u>, boost::intrusive::none, boost::intrusive::none>, boost::intrusive::constant_time_size<false>, boost::intrusive::none>' has no member named 'erase'

D:\ReferenceSystem\equalrefsystem\/src\EqualRefSystem.h:96: error: 'class boost::intrusive::list<base::EqualRefSystem, boost::intrusive::list_base_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0u>, boost::intrusive::none, boost::intrusive::none>, boost::intrusive::constant_time_size<false>, boost::intrusive::none>' has no member named 'iterator_to'

Process terminated with status 1 (0 minutes, 2 seconds)

6 errors, 0 warnings

J'ai regardé la source (list.hpp) mais je n'ai pas compris d'où venait l'erreur.
Je précise, le fichier boost/intrusive/list.hpp est bien inclus dans le code ci-dessus.

Ce pourquoi je vous demande votre aide.

Merci d'avance,

~Darktib

[Darktib]

C'est résolu, l'erreur était débile. Je met la solution si d'autres rencontrent le même problème:
il faut changer le

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            boost::intrusive::list<EqualRefSystem,
 
                    boost::intrusive::list_base_hook< boost::intrusive::link_mode<boost::intrusive::normal_link> >,
 
                    boost::intrusive::constant_time_size<false> > ReferencedBy;

en

Code :

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            boost::intrusive::list<EqualRefSystem,
 
                    boost::intrusive::base_hook<boost::intrusive::list_base_hook< boost::intrusive::link_mode<boost::intrusive::normal_link> > >,
 
                    boost::intrusive::constant_time_size<false> > ReferencedBy;

(le base_hook<...> manquait)

Et il faut virer le const dans les arguments de reference.