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Is Meyers' implementation of the Singleton pattern thread safe?
... The snippet from the standard addresses construction but not destruction. Does the standard prevent the object from being destructed on one thread while (or before) another thread tries to access it at program termination?
– stewbasic
Jul 10 '17 at 0:50
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NSDefaultRunLoopMode vs NSRunLoopCommonModes
...n the background, and update your view main thread layer after doing this. does this sound reasonable?
– nebillo
Jul 3 '14 at 11:18
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Are there any SHA-256 javascript implementations that are generally considered trustworthy?
...bally) but also re-hashing it with a random session salt every login which DOES provide a little extra security over the network against sniffing. If the server gets compromised it's game over, but that's true for anything not truely p2p anyways.
– Hatagashira
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How to change the default collation of a table?
... What are the implications of changing the default character set? Does it update existing data and therefore need to run through the table and make updates, locking it, etc.?
– grant
Nov 3 '15 at 21:12
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How to do an INNER JOIN on multiple columns
...ghts f INNER JOIN airports a ON a.code = f.fairport OR a.code = f.tairport Does it make any difference? What do you think?
– Ankur-m
Oct 22 '13 at 7:26
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Difference between .tagName and .nodeName
...ame which suffers from this behaviour across all
versions of IE
IE 5.5 doesn’t support nodeName for the document element or for attributes. Neither of these should be a concern for most practical
purposes but should be kept in mind in any case
Konqueror ignores comment nodes when using thi...
PHP Timestamp into DateTime
...timestamp in order to create the DateTime object (in fact, its constructor doesn't even allow you to do this, as you can tell). You can simply feed your date string into the DateTime constructor as-is:
// Assuming $item->pubDate is "Mon, 12 Dec 2011 21:17:52 +0000"
$dt = new DateTime($item->...
How to plot two histograms together in R?
... is an even simpler solution using base graphics and alpha-blending (which does not work on all graphics devices):
set.seed(42)
p1 <- hist(rnorm(500,4)) # centered at 4
p2 <- hist(rnorm(500,6)) # centered at 6
plot( p1, col=rgb(0,0,1,1/4), xlim=c(0,10))...
How do I get the opposite (negation) of a Boolean in Python?
...ecause bool is a subclass of int the result could be unexpected because it doesn't return the "inverse boolean", it returns the "inverse integer":
>>> ~True
-2
>>> ~False
-1
That's because True is equivalent to 1 and False to 0 and bitwise inversion operates on the bitwise repre...
Caching a jquery ajax response in javascript/browser
...n the response from there; if not make a fresh call.
Smartjax plugin also does similar things; but as your requirement is just saving the call response, you can write your code inside your jQuery ajax success function to save the response. And before making call just check if the response is alread...