StackOverflow2013

Note that there are some explanatory texts on larger screens.

plurals

PO
primarykey
Id
6307577
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
2
CommunityOwnedDate
CreationDate
2011-06-10T14:14:15.683
FavoriteCount
0
LastActivityDate
2011-06-10T14:14:15.683
LastEditDate
LastEditorUserId
0
OwnerUserId
670027
ParentId
6307261
PostTypeId
2
Score
0
ViewCount
0
LastEditorDisplayName
text
Body
I am not quite sure what you are asking, but I can tell you a way to access individual bits in a byte, which is perhaps what bitsets do. Mind you that the following code is not my own and is Microsoft spec (!). Create a struct as such: <pre><code>struct Byte { bool bit1:1; bool bit2:1; bool bit3:1; bool bit4:1; bool bit5:1; bool bit6:1; bool bit7:1; bool bit8:1; } </code></pre> The ':1' part of this code are bitfields. <a href="http://msdn.microsoft.com/en-us/library/ewwyfdbe(v=vs.80).aspx" rel="nofollow">http://msdn.microsoft.com/en-us/library/ewwyfdbe(v=vs.80).aspx</a> They define how many bits a variable is desired to occupy, so in this struct, there are 8 bools that occupy 1 bit each. In total, the 'Byte' struct is therefore 1 byte in size. Now if you have a byte of data, such as a char, you can store this data in a Byte object as follows: <pre><code>char a = 'a'; Byte oneByte; oneByte = *(Byte*)(&a); // Get the address of a (a pointer, basically), cast this // char* pointer to a Byte*, // then use the reference operator to store the data that // this points to in the variable oneByte. </code></pre> Now you can access (and alter) the individual bits by accessing the bool member variables of oneByte. In order to store the altered data in a char again, you can do as follows: <pre><code>char b; b = *(char*)(&oneByte); // Basically, this is the reverse of what you do to // store the char in a Byte. </code></pre> I'll try to find the source of this technique, to give credit where credit is due. Also, again I am not entirely sure whether this answer is of any use to you. I interpreted your question as being 'how would access to individual bits be handled internally?'.
Tags
Title
singulars
PostAcceptedAnswerId
1. This table or related slice is empty.
PostParentId
1. POBitset Reference
 singulars
 PostTypePostTypeId
 PTQuestion
PostTypePostTypeId
1. PTAnswer
UserLastEditorUserId
1. This table or related slice is empty.
UserOwnerUserId
1. USRycul
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. This table or related slice is empty.
CommentsPostId
1. COThe question is about the classes `std::bitset` and `std::bitset::reference` of the C++ standard library.
 singulars
 PostPostId
 PO
 UserUserId
 USMatteo Italia
2. CO@Matteo Italia: I know that much, I interpreted the question as though being asked how these classes' access to bits are implemented internally.
 singulars
 PostPostId
 PO
 UserUserId
 USRycul

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.