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Why doesn't GCC optimize a*a*a*a*a*a to (a*a*a)*(a*a*a)?
I am doing some numerical optimization on a scientific application. One thing I noticed is that GCC will optimize the call pow(a,2) by compiling it into a*a , but the call pow(a,6) is not optimized and will actually call the library function pow , which greatly slows down the performance. (In ...
Why is this inline-block element pushed downward?
Following is my code and I want to understand that why #firstDiv is being pushed downward by all browsers. I really want to understand the inner workings of the fact that why its being pushed downward rather than pulling it upward by one way or another. (and I know how to align their tops :))
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Re-raise exception with a different type and message, preserving existing information
... CaughtException as e:
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raise NewException(e)
But most of the time, I think it would be simpler to catch the exception, handle it, and either raise the original exception (and preserve the traceback) or raise NewException(). If I were calling your code, and I received one of your custo...
Need to reset git branch to origin version
... I have used the git reset --hard origin/mybranch command several times when I didn't care about any local changes and just wanted a clean copy that matched the origin. However, today, this didn't work -- I still had a handful of new, unstaged files, and git kept promising me that it was a...
Why should hash functions use a prime number modulus?
A long time ago, I bought a data structures book off the bargain table for $1.25. In it, the explanation for a hashing function said that it should ultimately mod by a prime number because of "the nature of math".
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Truly understanding the difference between procedural and functional
I'm really having a hard time understanding the difference between procedural and functional programming paradigms.
9 A...
Boost Statechart vs. Meta State Machine
...eady mentioned, one of the key differences between the two libraries is runtime performance. While MSM probably offers the best you can get here, Statechart consciously trades memory and processor cycles towards better scalability.
With Boost.Statechart you can spread the layout (i.e. states, trans...
Ruby custom error classes: inheritance of the message attribute
I can't seem to find much information about custom exception classes.
4 Answers
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Can I run javascript before the whole page is loaded?
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You can run javascript code at any time. AFAIK it is executed at the moment the browser reaches the <script> tag where it is in. But you cannot access elements that are not loaded yet.
So if you need access to elements, you should wait until the DOM is ...
How and when to use ‘async’ and ‘await’
... line. Since b, c, d, and e all started executing at almost the exact same time as a (due to lack of the await), they should finish at roughly the same time in this case.
In the example below, the second block is starting a task and waiting for it to finish (that is what await does) before starting...