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When should I use a struct instead of a class?
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They've probably recommended this because if the struct is immutable, then it won't matter that it has value semantics rather than reference semantics. The distinction only matters if you mutate the object/struct after making a copy.
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How to output only captured groups with sed?
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echo "$string" | grep -Po '(?<=\D )(\d+)'
The -P option enables Perl Compatible Regular Expressions. See man 3 pcrepattern or man
3 pcresyntax.
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How to generate a core dump in Linux on a segmentation fault?
...pends on what shell you are using. If you are using bash, then the ulimit command controls several settings relating to program execution, such as whether you should dump core. If you type
ulimit -c unlimited
then that will tell bash that its programs can dump cores of any size. You can specif...
Using printf with a non-null terminated string
...intf will print up to 11 characters or until it encounters NULL, whichever comes first; in your example NULL comes first. Specifying a maximum length does not make NULL lose its "end-of-string" meaning for printf.
– DarkDust
Feb 17 '19 at 8:59
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PHP random string generator
...ia, It's better "wasting" an extra variable as of calling an method in the compare condition of an loop.
– Rico Sonntag
Aug 16 '13 at 8:58
210
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Saving and loading objects and using pickle
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What is the difference between instanceof and Class.isAssignableFrom(…)?
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When using instanceof, you need to know the class of B at compile time. When using isAssignableFrom() it can be dynamic and change during runtime.
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How do I revert all local changes in Git managed project to previous state?
I have a project in which I ran git init .
After several commits, I did git status which told me everything was up to date and there were no local changes.
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Using sed and grep/egrep to search and replace
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Use this command:
egrep -lRZ "\.jpg|\.png|\.gif" . \
| xargs -0 -l sed -i -e 's/\.jpg\|\.gif\|\.png/.bmp/g'
egrep: find matching lines using extended regular expressions
-l: only list matching filenames
-R: search recursivel...