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void in C# generics?
...ou can use object: it is a little inconvenience because your would-be-void functions need to return null, but if it unifies your code, it should be a small price to pay.
This inability to use void as a return type is at least partially responsible for a split between the Func<...> and Action&...
Check existence of input argument in a Bash shell script
...tor. There are other expansion operators as well:
${varname:=word} which sets the undefined varname instead of returning the word value;
${varname:?message} which either returns varname if it's defined and is not null or prints the message and aborts the script (like the first example);
${varname:...
How to remove multiple indexes from a list at the same time? [duplicate]
...ping for delete ? Why if you loop in normal order it raise an undefined offset exception ?
– kitensei
Jun 20 '14 at 21:19
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Docker build “Could not resolve 'archive.ubuntu.com'” apt-get fails to install anything
...service docker restart
Delete any images which have cached the invalid DNS settings.
Build again and the problem should be solved.
Credit goes to Andrew SB
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Convert RGB to RGBA over white
...the limiting factor in the problem, so bind this to m:
m = min(r, g, b)
Set the corresponding output value, m', to zero, as we want to maximize transparency:
0 = (m - 1) / a' + 1
-1 = (m - 1) / a'
-a' = m - 1
a' = 1 - m
So, in javascript (translating from 1 to 255 along the way):
function rgb...
How to get the function name from within that function?
...throw away function names, to compress better; you may need to tweak their settings to avoid that.
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Get current directory name (without full path) in a Bash script
...from cding through symbolic links, whether bash has the -o physical option set, and so on. This used to get especially nasty around handling of automounted directories, where recording the physical path instead of the logical one would produce a path that, if used, would allow the automounter to sp...
Differences between numpy.random and random.random in Python
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Is there a performance difference between i++ and ++i in C++?
We have the question is there a performance difference between i++ and ++i in C?
17 Answers
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Python initializing a list of lists [duplicate]
I intend to initialize a list of list with length of n.
1 Answer
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