StackOverflow2013

Note that there are some explanatory texts on larger screens.

plurals

PO
primarykey
Id
2206960
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2010-02-05T11:54:10.807
FavoriteCount
0
LastActivityDate
2010-02-05T11:54:10.807
LastEditDate
LastEditorUserId
0
OwnerUserId
266978
ParentId
2203388
PostTypeId
2
Score
2
ViewCount
0
LastEditorDisplayName
text
Body
It is possible to create an inheritance tree for containers, reflecting the inheritance tree of the data. If you have the following data: <pre><code>class Interface { public: virtual ~Interface() {} virtual void print() = 0; }; class Number : public Interface { public: Number(int value) : x( value ) {} int get() const { return x; } void print() { std::printf( "%d\n", get() ); }; private: int x; }; class String : public Interface { public: String(const std::string & value) : x( value ) {} const std::string &get() const { return x; } void print() { std::printf( "%s\n", get().c_str() ); } private: std::string x; }; </code></pre> You could also have the following containers: <pre><code>class GenericContainer { public: GenericContainer() {} ~GenericContainer() { v.clear(); } virtual void add(Interface &obj) { v.push_back( &obj ); } Interface &get(unsigned int i) { return *v[ i ]; } unsigned int size() const { return v.size(); } private: std::vector<Interface *> v; }; class NumericContainer : public GenericContainer { public: virtual void add(Number &obj) { GenericContainer::add( obj ); } Number &get(unsigned int i) { return (Number &) GenericContainer::get( i ); } }; class TextContainer : public GenericContainer { public: virtual void add(String &obj) { GenericContainer::add( obj ); } String &get(unsigned int i) { return (String &) GenericContainer::get( i ); } }; </code></pre> This is not the best performing code; it is just to give an idea. The only problem with this approach is that every time you add a new Data class, you have to also create a new Container. Apart from that, you have polymorphism "working again". You can be specific or general: <pre><code>void print(GenericContainer & x) { for(unsigned int i = 0; i < x.size(); ++i) { x.get( i ).print(); } } void printNumbers(NumericContainer & x) { for(unsigned int i = 0; i < x.size(); ++i) { printf( "Number: " ); x.get( i ).print(); } } int main() { TextContainer strContainer; NumericContainer numContainer; Number n( 345 ); String s( "Hello" ); numContainer.add( n ); strContainer.add( s ); print( strContainer ); print( numContainer ); printNumbers( numContainer ); } </code></pre>
Tags
Title
singulars
PostAcceptedAnswerId
1. This table or related slice is empty.
PostParentId
1. POC++ Templates polymorphism
 singulars
 PostTypePostTypeId
 PTQuestion
PostTypePostTypeId
1. PTAnswer
UserLastEditorUserId
1. This table or related slice is empty.
UserOwnerUserId
1. USBaltasarq
plurals
PostLinksPostIdRelatedPostId
1. This table or related slice is empty.
PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
PostsAcceptedAnswerId
1. This table or related slice is empty.
PostsParentIdCreationDate
1. This table or related slice is empty.
VotesPostIdCreationDate
1. VO
 singulars
 PostPostId
 PO
 UserUserId
 This table or related slice is empty.
 VoteTypeVoteTypeId
 VTUpMod
2. VO
 singulars
 PostPostId
 PO
 UserUserId
 This table or related slice is empty.
 VoteTypeVoteTypeId
 VTUpMod
CommentsPostId
1. This table or related slice is empty.

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.