Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>Make your wrappers to be a data.<br> Create factory that will return either data or different wrappers. Here is what I mean. </p> <pre><code>class DataStructure { public: typedef int DataType; DataStructure( int id ): id_( id ) {} DataStructure( const DataStructure&amp; dataStructure ); virtual ~DataStructure(); virtual void Set( const DataType&amp; data ) { data_ = data; } virtual DataType Get() const { return data_; } int id() const { return id_; } private: DataType data_; int id_; }; class WrapperBase : public DataStructure { public: WrapperBase( DataStructure* dataStructure ): DataStructure( dataStructure-&gt;id() ), dataStructure_( dataStructure ) {} virtual void Set( const DataType&amp; data ); virtual DataType Get() const; protected: DataStructure* dataStructure_; }; class WrapperOne : public WrapperBase { public: WrapperOne( DataStructure* dataStructure ); virtual void Set( const DataType&amp; data ); virtual DataType Get() const; }; class WrapperTwo : public WrapperBase { public: WrapperTwo( DataStructure* dataStructure ); virtual void Set( const DataType&amp; data ); virtual DataType Get() const; }; DataStructure* getWrapper( DataStructure* dataStructure ) { switch ( dataStructure-&gt;id() ) { case 1: return new WrapperOne( dataStructure ); case 2: return new WrapperTwo( dataStructure ); default: return new DataStructure( *dataStructure ); } } void processData(DataStructure *dataStructure) { std::auto_ptr&lt;DataStructure&gt; wrapper( getWrapper( dataStructure ) ); processDataImpl( wrapper.get() ); } </code></pre>
    singulars
    1. This table or related slice is empty.
    1. POWrapping a data structure
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USMykola Golubyev
    1. USMykola Golubyev
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. POWrapping a data structure
      singulars
      1. PTQuestion
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTAcceptedByOriginator
    1. COYou're deriving from DataStructure and at the same time keeping a pointer to a DataStructure object in your wrappers. What's the point of doing that?
      singulars
      1. PO
      1. USdrby
    2. CODerive - to be able to pass wrapper instead of DataStructure. Keep pointer - to be able to implement get and set. In the trvial case it will be dataStructure_->Get(). It could be dataStructure_->Get() * 2;
      singulars
      1. PO
      1. USMykola Golubyev
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload