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How do I use extern to share variables between source files?
...is informed that a
variable exists (and this is its type); it does not allocate the
storage for the variable at that point.
A variable is defined when the compiler allocates the storage for
the variable.
You may declare a variable multiple times (though once is sufficient);
you may only define it...
How to convert an enum type variable to a string?
... unnoticed, because the related printing facility is only used by the application debugging code. 2 month later, you are the first one to actually execute that debug code: it then gives you the wrong information, so you lose half a day building assumptions based on this wrong information, before rea...
Use RSA private key to generate public key?
...A key generated by the openssl command above run the following (output truncated to labels here):
openssl rsa -in private.pem -text -noout | less
modulus - n
privateExponent - d
publicExponent - e
prime1 - p
prime2 - q
exponent1 - d mod (p-1)
exponent2 - d mo...
Using IPython notebooks under version control
.../ipynb_output_filter.py
git config --global filter.dropoutput_ipynb.smudge cat
Done!
Limitations:
it works only with git
in git, if you are in branch somebranch and you do git checkout otherbranch; git checkout somebranch, you usually expect the working tree to be unchanged. Here instead you w...
Detect if stdin is a terminal or pipe?
...S S_ISCHR
./test ≺ test.cc /dev/tty OK NO S_ISREG
cat test.cc | ./test /dev/tty OK NO S_ISFIFO
echo ./test | at now /dev/tty FAIL NO S_ISREG
The results are from a Ubuntu Linux 11.04 system using following program:
#include <stdio.h>
#inclu...
Saving utf-8 texts in json.dumps as UTF8, not as \u escape sequence
...(d, ensure_ascii=False, encoding='utf8')
json_file.write(unicode(data))
cat filename
{"keyword": "bad credit çredit cards"}
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Optimistic vs. Pessimistic locking
...rity than optimistic locking but requires you to be careful with your application design to avoid Deadlocks. To use pessimistic locking you need either a direct connection to the database (as would typically be the case in a two tier client server application) or an externally available transaction...
What techniques can be used to define a class in JavaScript, and what are their trade-offs?
...Self)
multimethod-based OO (first introduced by CommonLoops, I think)
predicate-based OO (no idea)
And probably others I don't know about.
JavaScript implements prototype-based OO. In prototype-based OO, new objects are created by copying other objects (instead of being instantiated from a class ...
How to find and return a duplicate value in array
...
@Kalanamith you can get duplicated values using this a.select {|e| a.count(e) > 1}.uniq
– Naveed
Jul 12 '13 at 16:34
...
gunicorn autoreload on source change
....js" --recursive --command='echo "${watch_src_path}" && kill -HUP `cat gunicorn.pid`' . &
python manage.py run_gunicorn 127.0.0.1:80 --pid=gunicorn.pid
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