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Delete/Reset all entries in Core Data?
...p;error]) {
// do something with the error
}
}
Note that in order to call self.persistentStoreCoordinator I declared a property in the Home View Controller. (Don't worry about the managedObjectContext that I use for saving and loading.)
@property (nonatomic, retain) NSManagedObjectCo...
Test for multiple cases in a switch, like an OR (||)
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理解和配置 Linux 下的 OOM Killer - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...on-rss:3744kB, file-rss:80kB
httpd invoked oom-killer: gfp_mask=0x201da, order=0, oom_adj=0, oom_score_adj=0
httpd cpuset=/ mems_allowed=0
Pid: 8911, comm: httpd Not tainted 2.6.32-279.1.1.el6.i686 #1
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21556 total pagecache pages
21049 pages in swap cache
Swap cache stats: add 12819...
java.util.regex - importance of Pattern.compile()?
...d reset a Matcher object that is only ever used by one thread at a time in order to reduce allocations.
– AndrewF
Jul 3 '19 at 20:40
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Check if a given key already exists in a dictionary and increment it
...ward suggests "the overhead in Exception handling in languages is always a order of magnitude greater than the hash table lookup that determines whether the item exists or not in the dictionary", while you are saying "It also avoids the duplicate key lookup in the dictionary ... if lookup is expensi...
How to append to a file in Node?
...tten by timestamp. You can test with example, set 1000 in place of 100000, order will be random, depends on access to file.
If you want to append to a file, you must use a writable stream like this:
var stream = fs.createWriteStream("append.txt", {flags:'a'});
console.log(new Date().toISOString())...
How to make gradient background in android
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Visual examples help with this kind of question.
Boilerplate
In order to create a gradient, you create an xml file in res/drawable. I am calling mine my_gradient_drawable.xml:
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android...
How to get the CPU Usage in C#?
...is required, but the high level summary is that you need to two samples in order to calculate the value, and you need to give the OS a time to get both of these.
– Cleggy
Jan 24 '12 at 1:48
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DatabaseError: current transaction is aborted, commands ignored until end of transaction block?
... I'm getting this error when doing syncdb - I think it's to do with the order django goes through the tables.
– Stuart Axon
May 9 '12 at 15:41
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Can I install Python 3.x and 2.x on the same Windows computer?
...ndows) which is then associated with py and pyw scripts, respectively.
In order to use the new launcher (without manually setting up your own associations to it), leave the "Register Extensions" option enabled. I'm not quite sure why, but on my machine it left Py 2.7 as the "default" (of the launc...