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When do I really need to use atomic instead of bool? [duplicate]
Isn't atomic<bool> redundant because bool is atomic by nature? I don't think it's possible to have a partially modified bool value. When do I really need to use atomic<bool> instead of bool ?
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onActivityResult() & onResume() [duplicate]
...() occurs as part of restarting an app that has been flushed out of memory by the OS (because onResume() would not have been called prior to onActivityResult()).
In this situation, onActivityResult() would have to be prepared to perform such initializations for any such variables that are used by o...
How to gracefully handle the SIGKILL signal in Java
...ERM. Programs can handle that signal. The program should handle the signal by doing a controlled, but rapid, shutdown. When a computer shuts down, the final stage of the shutdown process sends every remaining process a SIGTERM, gives those processes a few seconds grace, then sends them a SIGKILL.
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Easy idiomatic way to define Ordering for a simple case class
...our go-to for any sorting scenario involving a composite sort key:
as.sortBy(a => (a.tag, a.load))
As this answer has proven popular I would like to expand on it, noting that a solution resembling the following could under some circumstances be considered enterprise-grade™:
case class Emplo...
How can I select rows with most recent timestamp for each key value?
... MAX(timestamp) FROM sensorTable s2 WHERE s1.sensorID = s2.sensorID)
ORDER BY sensorID, timestamp;
Pretty self-explaining I think, but here's more info if you wish, as well as other examples. It's from the MySQL manual, but above query works with every RDBMS (implementing the sql'92 standard).
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How is Perl's @INC constructed? (aka What are all the ways of affecting where Perl modules are searc
...der listed in this answer, e.g. default @INC is last in the list, preceded by PERL5LIB, preceded by -I, preceded by use lib and direct @INC manipulation, the latter two mixed in whichever order they are in Perl code.
References:
perldoc perlmod
perldoc lib
Perl Module Mechanics - a great guide co...
Font from origin has been blocked from loading by Cross-Origin Resource Sharing policy
...s
Header add Access-Control-Allow-Origin "*"
even better, as suggested by @david thomas, you can use a specific domain value, e.g.
Header add Access-Control-Allow-Origin "your-domain.com"
share
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When to use valueChangeListener or f:ajax listener?
...hen using <f:ajax listener> instead of valueChangeListener, it would by default executed during the HTML DOM change event already. Inside UICommand components and input components representing a checkbox or radiobutton, it would be by default executed during the HTML DOM click event only.
<...
Catch-22 prevents streamed TCP WCF service securable by WIF; ruining my Christmas, mental health
...se out the message with the usual hash function and xml signature required by ws-security. If it has to read the entire stream to sign the single message (which is not really a message, but it's a single continuous stream) then you can see the problem here. WCF will have to stream it once "locally" ...
Rails: Why does find(id) raise an exception in rails? [duplicate]
...e architects intended find(id) to work, as indicated in the RDoc:
Find by id - This can either be a specific id (1), a list of ids (1, 5, 6), or an array of ids ([5, 6, 10]). If no record can be found for all of the listed ids, then RecordNotFound will be raised.
If you don't want the exceptio...