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What is NSZombie?
...nabled then whenever an object reaches retain count 0, rather than being deallocated it morphs itself into an NSZombie instance. Whenever such a zombie receives a message, it logs a warning rather than crashing or behaving in an unpredictable way. As such, you can debug subtle over-release/autorelea...
Iteration over std::vector: unsigned vs signed index variable
...yClass]’
instantiated from here
dependent-name ‘std::vector<T*,std::allocator<T*> >::iterator’ is parsed as a non-type, but instantiation yields a type
note: say ‘typename std::vector<T*,std::allocator<T*> >::iterator’ if a type is meant
The solution is using the ...
Change UICollectionViewCell size on different device orientations
...ically in -viewDidLoad
self.portraitLayout = [[UICollectionViewFlowLayout alloc] init];
self.landscapeLayout = [[UICollectionViewFlowLayout alloc] init];
UIInterfaceOrientation orientationOnLunch = [[UIApplication sharedApplication] statusBarOrientation];
if (UIInterfaceOrientationIsPortrait(orie...
How do I calculate tables size in Oracle
...
You might be interested in this query. It tells you how much space is allocated for each table taking into account the indexes and any LOBs on the table. Often you are interested to know "How much spaces the the Purchase Order table take, including any indexes" rather than just the table itsel...
jquery IDs with spaces
...or this is simple, space character is not a valid for ID attribute.
ID tokens must begin with a letter
([A-Za-z]) and may be followed by any
number of letters, digits ([0-9]),
hyphens ("-"), underscores ("_"),
colons (":"), and periods (".").
But if you don't care about standards try $...
Android Center text on canvas
...Bounds(Rect) instead. (Do not use Canvas.getClipBounds().getHeight() as it allocates memory for a Rect.)
For reasons of performance, you should allocate objects before they are used in onDraw(). As drawCenter() will be called within onDraw() the object Rect r is preallocated as a field here.
I ...
Identity increment is jumping in SQL Server database
... since SQL Server 2012.
It now by default uses a cache size of 1,000 when allocating IDENTITY values for an int column and restarting the service can "lose" unused values (The cache size is 10,000 for bigint/numeric).
This is mentioned in the documentation
SQL Server might cache identity valu...
Supabase扩展能实现实时推送吗？源码级Realtime能力分析 - App应用开发 - ...
.../realtime/v1/websocket
2. 连接时携带apikey和可选的 Authorization token
3. 连接建立后进入 Phoenix Channels 交互
Phoenix Channels 消息格式
所有消息都是 JSON，包含以下字段：
- topic：频道名称（如 "realtime:public"）
- event：事件类型（...
Generating random number between 1 and 10 in Bash Shell Script [duplicate]
...
I get a syntax error: syntax error near unexpected token `+' on Linux
– Spaceghost
Aug 19 '13 at 17:57
40
...
What is JavaScript garbage collection?
...ier
post.)
At this point we know that all the
memory still marked is allocated
memory which cannot be reached by any
path from any in-scope variable. All
of those objects are instructed to
tear themselves down, which destroys
any circular references.
The main purpose of garbage...