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What does -> mean in Python function definitions?
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It's a function annotation.
In more detail, Python 2.x has docstrings, which allow you to attach a metadata string to various types of object. This is amazingly handy, so Python 3 extends the feature by allowing you to attach metadata to functions describi...
check android application is in foreground or not? [duplicate]
... the current foreground application from a background task or service fore more information..
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How do you change the server header returned by nginx?
...n, replacing Nginx's standard HttpHeadersModule with the forked HttpHeadersMoreModule. Recompiling the standard module is still the quick fix, and makes sense if you want to use the standard module and won't be changing the server string often. But if you want more than that, the HttpHeadersMoreModu...
How do I create a unique ID in Java? [duplicate]
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Is it better to use std::memcpy() or std::copy() in terms to performance?
...was passed in to the function as a function parameter.
I did a little bit more testing to see what I could do to make std::copy faster again. The answer turned out to be simple: turn on link time optimization. These are my results with LTO turned on (option -flto in gcc):
Time (in seconds) to comp...
Rails: Is there a rails trick to adding commas to large numbers?
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What is the Swift equivalent to Objective-C's “@synchronized”?
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You can use GCD. It is a little more verbose than @synchronized, but works as a replacement:
let serialQueue = DispatchQueue(label: "com.test.mySerialQueue")
serialQueue.sync {
// code
}
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Find the Smallest Integer Not in a List
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Prevent HTML5 video from being downloaded (right-click saved)?
...o Save As, you only save a chunk, not the whole video. It would take a bit more effort to gather all the chunks and stitch them using some dedicated software.
Another technique is to paint <video> on <canvas>. In this technique, with a bit of JavaScript, what you see on the page is a &l...
Ball to Ball Collision - Detection and Handling
...ther balls on the boundaries of a section, so this may make your code much more complicated. Efficiency probably won't matter until you have several hundred balls though. For bonus points, you can run each section on a different core, or split up the processing of collisions within each section.
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