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How do I check if a string is a number (float)?
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Which, not only is ugly and slow
I'd dispute both.
A regex or other string parsing method would be uglier and slower.
I'm not sure that anything much could be faster than the above. It calls the function and returns. Try/Catch doesn't introd...
How do you create a random string that's suitable for a session ID in PostgreSQL?
I'd like to make a random string for use in session verification using PostgreSQL. I know I can get a random number with SELECT random() , so I tried SELECT md5(random()) , but that doesn't work. How can I do this?
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Difference between
What is the difference between List<? super T> and List<? extends T> ?
14 Answers
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Are the shift operators () arithmetic or logical in C?
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When shifting left, there is no difference between arithmetic and logical shift. When shifting right, the type of shift depends on the type of the value being shifted.
(As background for those readers unfamiliar with the difference, a "logical" right shift by 1 bit shifts all the bits ...
Convert line-endings for whole directory tree (Git)
...ks to toolbear, here is a one-liner that recursively replaces line endings and properly handles whitespace, quotes, and shell meta chars.
find . -type f -exec dos2unix {} \;
If you're using dos2unix 6.0 binary files will be ignored.
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When do I use fabs and when is it sufficient to use std::abs?
I assume that abs and fabs are behaving different when using math.h . But when I use just cmath and std::abs , do I have to use std::fabs or fabs ? Or isn't this defined?
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How can I pipe stderr, and not stdout?
I have a program that writes information to stdout and stderr , and I need to grep through what's coming to stderr , while disregarding stdout .
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Best way to check for “empty or null value”
...red May 20 '14 at 18:47
Erwin BrandstetterErwin Brandstetter
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XDocument or XmlDocument
I am now learning XmlDocument but I've just ran into XDocument and when I try to search the difference or benefits of them I can't find something useful, could you please tell me why you would use one over another ?
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Why shouldn't all functions be async by default?
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First off, thank you for your kind words. It is indeed an awesome feature and I am glad to have been a small part of it.
If all my code is slowly turning async, why not just make it all async by default?
Well, you're exaggerating; all your code isn't turning async. When you add two "plain" in...