StackOverflow2013

Note that there are some explanatory texts on larger screens.

plurals

PO
primarykey
Id
11058650
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
1
CommunityOwnedDate
CreationDate
2012-06-15T21:51:10.393
FavoriteCount
0
LastActivityDate
2012-06-15T21:51:10.393
LastEditDate
LastEditorUserId
0
OwnerUserId
570445
ParentId
11058402
PostTypeId
2
Score
5
ViewCount
0
LastEditorDisplayName
text
Body
In your output sequence, the pointers are alternating between <code>0xc1e048</code> and <code>0x696828</code>, implying that <code>0xc1e048</code> is the first item in the list and <code>0x696828</code> is the second. Based on that, it looks like the object at <code>0xc1e048</code> is getting unlinked while <code>GameTurn::GameTurn</code> is in the middle of the loop, most likely in the call to <code>timeobject->mapobject_->Tick()</code>, or by another thread as mentioned by @hmjd. Removing an object from the list makes the iterator pointing to the object invalid. Assuming the code is single threaded and the call to <code>Tick</code> is causing the problem, then something like this might work: <pre><code>void GameTime::GameTurn(uint16_t _time) { tick_ += _time; for(std::list<TimeObject*>::iterator it = TimeObject::list_.begin(); it != TimeObject::list_.end(); ) { TimeObject *timeobject = *it; ++it; printf("GameTurn %p\n", timeobject); if(timeobject == NULL) { printf("continue\n"); continue; } timeobject->time_ += _time; if(timeobject->speed_ && timeobject->time_ >= timeobject->speed_) { while(timeobject->timeobject_flags_.linked_ && timeobject->time_ - timeobject->speed_ > 0) { timeobject->time_ -= timeobject->speed_; if(timeobject->mapobject_) { timeobject->mapobject_->Tick(); } } } } } </code></pre> (The only difference is the the increment of <code>it</code> is moved from the <code>for</code> statement to the loop body after assigning <code>it</code> to <code>timeobject</code>. Advancing <code>it</code> before it can be invalidated should fix the problem. If your code is multithreaded, you will need a mutex.
Tags
Title
singulars
PostAcceptedAnswerId
1. This table or related slice is empty.
PostParentId
1. POstd::list of pointers becomes invalid on entry removal
 singulars
 PostTypePostTypeId
 PTQuestion
PostTypePostTypeId
1. PTAnswer
UserLastEditorUserId
1. This table or related slice is empty.
UserOwnerUserId
1. USwrdieter
plurals
PostLinksPostIdRelatedPostId
1. This table or related slice is empty.
PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
PostsAcceptedAnswerId
1. POstd::list of pointers becomes invalid on entry removal
 singulars
 PostTypePostTypeId
 PTQuestion
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
3. VO
 singulars
 PostPostId
 PO
 UserUserId
 This table or related slice is empty.
 VoteTypeVoteTypeId
 VTUpMod
CommentsPostId
1. COI ended up going with something quite similar. Even though it is single threaded I redesigned it so that it could be multithreaded.
 singulars
 PostPostId
 PO
 UserUserId
 USShawn Buckley

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.