Topic: std::unique_ptr for DB objects... or bad idea

[nullptr]

std::unique_ptr for DB objects... or bad idea lol

Code - C++: [Select]

template <class T>
class DBObjectDeleter
{
public:
    inline void operator()(T *p)
    {
        if (p != nullptr)
            return this->close(p);
    }
private:
    inline void close(T *p)
    {
        if (!p->objectId().isNull())
            p->close();
        else
            this->deleter(p);
    }
    inline void deleter(T *p)
    {
        delete p;
        p = nullptr;
    }
};
 
template<typename T>
using unique_dbo_ptr = std::unique_ptr<T, DBObjectDeleter<T>>;
 
typedef unique_dbo_ptr<AcDbLine> AcDbLineUPtr;
 

Code - C++: [Select]

    void quaz()
    {
        AcDbLineUPtr pLine(new AcDbLine());
        //...
    }
 

[nullptr]

along the same lines

Code - C++: [Select]

typedef std::unique_ptr<AcDbDictionaryIterator> AcDbDictionaryIteratorPtr;
typedef std::unique_ptr<AcDbBlockTableIterator> AcDbBlockTableIteratorPtr;
typedef std::unique_ptr<AcDbBlockTableRecordIterator> AcDbBlockTableRecordIteratorPtr;
 
inline AcDbBlockTableIteratorPtr createBlockTableIterator
(
    const AcDbBlockTable* pSrc,
    Acad::ErrorStatus *stat = nullptr,
    bool atBeginning = true,
    bool skipDeleted = true
)
{
    Acad::ErrorStatus _stat = eOk;
    AcDbBlockTableIterator *pIter = nullptr;
    if (pSrc != nullptr)
        _stat = pSrc->newIterator(pIter, atBeginning, skipDeleted);
    if (stat != nullptr)
        *stat = _stat;
    return AcDbBlockTableIteratorPtr(pIter);
}
 
inline AcDbBlockTableRecordIteratorPtr createBlockTableRecordIterator
(
    const AcDbBlockTableRecord* pSrc,
    Acad::ErrorStatus *stat = nullptr,
    bool atBeginning = true,
    bool skipDeleted = true
)
{
    Acad::ErrorStatus _stat = eOk;
    AcDbBlockTableRecordIterator *pIter = nullptr;
    if (pSrc != nullptr)
        _stat = pSrc->newIterator(pIter, atBeginning, skipDeleted);
    if (stat != nullptr)
        *stat = _stat;
    return AcDbBlockTableRecordIteratorPtr(pIter);
}
 

Code - C++: [Select]

   static void foo(void)
    {
        AcDbObjectId rid, id;
        AcDbDatabase *pDb = acdbHostApplicationServices()->workingDatabase();
        AcDbBlockTablePointer pBT(pDb->blockTableId());
        AcDbBlockTableIteratorPtr pBTIter = createBlockTableIterator(pBT);
        for (pBTIter->start(); !pBTIter->done(); pBTIter->step())
        {
            if (pBTIter->getRecordId(rid) == eOk)
            {
                AcDbBlockTableRecordPointer record(rid);
                AcDbBlockTableRecordIteratorPtr piter = createBlockTableRecordIterator(record);
                for (piter->start(); !piter->done(); piter->step())
                {
                    if (piter->getEntityId(id) == eOk)
                    {
                        AcDbEntityPointer pEnt(id);
                        //... yada yada 
                    }
                }
            }
        }
    }