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Is there a performance difference between i++ and ++i in C?
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Taking a leaf from Scott Meyers, More Effective c++ Item 6: Distinguish between prefix and postfix forms of increment and decrement operations.
The prefix version is always preferred over the postfix in regards to objects, especially in regards to iterators.
The reason for t...
Go Error Handling Techniques [closed]
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Your code is idiomatic and in my opinion it is the best practice available. Some would disagree for sure, but I would argue that this is the style seen all over the standard libraries in Golang. In other words, Go authors write error handling in this way.
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iOS Remote Debugging
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Update:
This is not the best answer anymore, please follow gregers' advice.
New answer:
Use Weinre.
Old answer:
You can now use Safari for remote debugging. But it requires iOS 6.
Here is a quick translation of http://html5-mobile.de/blog/ios6-...
How to check if running as root in a bash script
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A few answers have been given, but it appears that the best method is to use is:
id -u
If run as root, will return an id of 0.
This appears to be more reliable than the other methods, and it seems that it return an id of 0 even if the script is run through sudo.
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How can I convert tabs to spaces in every file of a directory?
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Simple replacement with sed is okay but not the best possible solution. If there are "extra" spaces between the tabs they will still be there after substitution, so the margins will be ragged. Tabs expanded in the middle of lines will also not work correctly. In bash, we...
How do I apply a perspective transform to a UIView?
... that's the left pane in Xcode. Just below Info.plist is fine.
Check "Copy items if needed" then click Finish.
Xcode will prompt you with the message "Would you like to configure an Objective-C bridging header?" Click "Create Bridging Header"
You should see a new file in your project, named YourProj...
How do I select elements of an array given condition?
...This could mean that an intermediate result is being cached.
100000 loops, best of 3: 1.15 µs per loop
>>> %timeit np.logical_and(a < b, b < c)
The slowest run took 32.59 times longer than the fastest. This could mean that an intermediate result is being cached.
1000000 loops, best ...
dd: How to calculate optimal blocksize? [closed]
...&stats))
{
printf("%u\n", stats.st_blksize);
}
}
The best way may be to experiment: copy a gigabyte with various block sizes and time that. (Remember to clear kernel buffer caches before each run: echo 3 > /proc/sys/vm/drop_caches).
However, as a rule of thumb, I've found t...
Decimal number regular expression, where digit after decimal is optional
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Best because it matches a number followed by a period (42.). However there is a bug/false positive as it matches this: 3....3 which can be fixed by adding two more parenthesis to enforce ^$ beginning and end characters: /^([...
Can I find out the return value before returning while debugging in Intellij?
... have to click on the Settings icon (the gear, right above the yellow menu item on the 2nd image), an a menu shows that includes "Show Method Return Values". No need to restart anything: after the next return from a method, its ObjectClassName.methodName() appears in the Variables view right below t...