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What is the difference between Amazon SNS and Amazon SQS?
I don't understand when I would use SNS versus SQS, and why are they always coupled together?
6 Answers
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Why is SSE scalar sqrt(x) slower than rsqrt(x) * x?
...hen an approximation suffices, but speed is required. If you read Intel's documentation, you will also find an instruction sequence (reciprocal square-root approximation followed by a single Newton-Raphson step) that gives nearly full precision (~23 bits of accuracy, if I remember properly), and is...
Days between two dates? [duplicate]
...y to see how many full days have passed between two dates?
Here's what I'm doing now.
4 Answers
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How can I get Git to follow symlinks?
...as per comment since Git 1.6.1. Git used to behave this way, and no longer does.
Git by default attempts to store symlinks instead of following them (for compactness, and it's generally what people want).
However, I accidentally managed to get it to add files beyond the symlink when the symlink ...
difference between #if defined(WIN32) and #ifdef(WIN32)
...s that #ifdef can only use a single condition,
while #if defined(NAME) can do compound conditionals.
For example in your case:
#if defined(WIN32) && !defined(UNIX)
/* Do windows stuff */
#elif defined(UNIX) && !defined(WIN32)
/* Do linux stuff */
#else
/* Error, both can't be defi...
get and set in TypeScript
...and getter pair is overkill. You can always add them later if you need to do something, like logging, whenever the property is read or written.
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what is faster: in_array or isset? [closed]
...using an array with values (10,000 in the test below), forcing in_array to do more searching.
isset: 0.009623
in_array: 1.738441
This builds on Jason's benchmark by filling in some random values and occasionally finding a value that exists in the array. All random, so beware that times will fl...
In pure functional languages, is there an algorithm to get the inverse function?
...t least one of the g j is indistinguishable from f, and since inv f hadn't done either of these evaluations, inv could not possibly have told it apart – short of doing some runtime-measurements on its own, which is only possible in the IO Monad.
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How are parameters sent in an HTTP POST request?
...tead, which has a different format. It's more complicated, but you usually don't need to care what it looks like, so I won't show an example, but it can be good to know that it exists.
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Git for beginners: The definitive practical guide
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How do you create a new project/repository?
A git repository is simply a directory containing a special .git directory.
This is different from "centralised" version-control systems (like subversion), where a "repository" is hoste...