大约有 44,000 项符合查询结果（耗时：0.0518秒） [XML]
Is PHP's count() function O(1) or O(n) for arrays?
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As a follow up you might want to read josephscott.org/archives/2010/01/php-count-performance It basically details how getting the array length is o(1) and the impact of the repeated function calls.
– TheClair
Apr 29 '11...
Private and Protected Members : C++
...he derived class writer could do to the hierarchy. Protected methods are already a potential problem. I am not convinced aggravating this by using protected state is the right approach.
– paercebal
Oct 11 '16 at 21:05
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Is there a way to measure how sorted a list is?
... I am a simpleton. I don't even know what correlation ratio is. When I read that Wikipedia article, right at the top, I'm asked to learn what "statistical dispersion" is, then "standard deviation", then "variation", then "interclass correlation coefficient". I learnt all of that, several times, ...
Creating an object: with or without `new` [duplicate]
This is probably a basic question, and might have already been asked (say, here ); yet I still don't understand it. So, let me ask it.
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How to express a One-To-Many relationship in Django
... the problem above? I'm probably just missing it completely, but I've been reading the Django documentation for some time now and am still unclear as to how to create this kind of relationship.
– Naftuli Kay
Aug 3 '11 at 15:44
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Send message to specific client with socket.io and node.js
...9AiCND_ZhdAAAC"].emit("socketFromServer", info); ^ TypeError: Cannot read property 'emit' of undefined
– Raz
Jan 11 '18 at 8:58
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How to view the assembly behind the code using Visual C++?
I was reading another question pertaining the efficiency of two lines of code, and the OP said that he looked at the assembly behind the code and both lines were identical in assembly. Digression aside, how could I view the assembly code created when a program is compiled.
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Meaning of “[: too many arguments” error from if [] (square brackets)
...nds contain both of two words):
find /usr/share/doc -name '*.txt' | while read file; do \
a1=$(grep -H "description" $file); \
a2=$(grep -H "changes" $file); \
[ ! -z "$a1" -a ! -z "$a2" ] && echo -e "$a1 \n $a2" ; \
done
Edit 12 Aug 2013: related problem note:
Note that when c...
Conveniently map between enum and int / String
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Really and truly read the question. If you're dealing with a legacy database or external system that has defined integers that you don't want to propagate through your own code, then this is exactly one of those cases. The ordinal is an ext...
Command line: piping find results to rm
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Thanks. I read the man page and gave that flag a try. I'm passing a full path but getting back "/usr/www2/bar/htdocs/foo/rsync/httpdocs/db_backups/: relative path potentially not safe". Any idea why?
– jerrygarc...