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What is a “callback” in C and how are they implemented?
From the reading that I have done, Core Audio relies heavily on callbacks (and C++, but that's another story).
9 Answers
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PostgreSQL return result set as JSON array?
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The json_agg function produces this result out of the box. It automatically figures out how to convert its input into JSON and aggregates it into an array.
SELECT json_agg(t) FROM t
There is no jsonb (introduced in 9.4) version of json_agg. You can either aggregate the rows into an array and...
Access properties file programmatically with Spring?
...ine, and has two more votes AND posted second...
– Zoidberg
Nov 20 '09 at 16:07
3
Beats me, I did...
Wrapping chained method calls on a separate line in Eclipse for Java
I haven't been successful in figuring out how to wrap each method call in Eclipse . For example, I have this:
7 Answers
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What is the session's “secret” option?
...ething like topsecret. The secret should be a random string of characters. Ideally you would also change it periodically in case it has been discovered. However, this requires support for secret rotation so you don't immediately invalidate existing sessions. That is, two session secrets should be co...
How can I know when an EditText loses focus?
...catch when an EditText loses focus, I've searched other questions but I didn't find an answer.
5 Answers
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Spring - @Transactional - What happens in background?
...vides a way for Spring to inject behaviors before, after, or around method calls into the object being proxied. Transaction management is just one example of the behaviors that can be hooked in. Security checks are another. And you can provide your own, too, for things like logging. So when you anno...
Execute the setInterval function without delay the first time
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It's simplest to just call the function yourself directly the first time:
foo();
setInterval(foo, delay);
However there are good reasons to avoid setInterval - in particular in some circumstances a whole load of setInterval events can arrive im...
Style disabled button with CSS
...nge the style of a button with an embedded image as seen in the following Fiddle:
11 Answers
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Why do this() and super() have to be the first statement in a constructor?
Java requires that if you call this() or super() in a constructor, it must be the first statement. Why?
19 Answers
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