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'typeid' versus 'typeof' in C++
...eof keyword.
typeid is a C++ language operator which returns type identification information at run time. It basically returns a type_info object, which is equality-comparable with other type_info objects.
Note, that the only defined property of the returned type_info object has is its being equal...
What's the difference between “groups” and “captures” in .NET regular expressions?
... will hold {S}, i.e. only the last matching group. However, and here's the catch, if you want to find the other two catches, they're in Captures, which contains all intermediary captures for {Q} {R} and {S}.
If you ever wondered how you could get from the multiple-capture, which only shows last mat...
OS X Bash, 'watch' command
I'm looking for the best way to duplicate the Linux 'watch' command on Mac OS X. I'd like to run a command every few seconds to pattern match on the contents of an output file using 'tail' and 'sed'.
...
JavaScript blob filename without link
...me of a blob file in JavaScript when force downloading it through window.location?
8 Answers
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How to round an average to 2 decimal places in PostgreSQL?
...s not define round(double precision, integer). For reasons @Mike Sherrill 'Cat Recall' explains in the comments, the version of round that takes a precision is only available for numeric.
regress=> SELECT round( float8 '3.1415927', 2 );
ERROR: function round(double precision, integer) does not ...
Command line CSV viewer? [closed]
... following example demonstrates how to use sed to insert a placeholder:
$ cat data.csv
1,2,3,4,5
1,,,,5
$ sed 's/,,/, ,/g;s/,,/, ,/g' data.csv | column -s, -t
1 2 3 4 5
1 5
$ cat data.csv
1,2,3,4,5
1,,,,5
$ column -s, -t < data.csv
1 2 3 4 5
1 5
$ sed 's/,,/, ,/g;s/,,/, ,/g' d...
How to print an exception in Python?
...Thus I strongly prefer printing the traceback as in the solution below by @Cat Plus Plus! E.g. I had an issue with an invalid unicode character during XML parsing and printing the exception showed only "invalid character" or so. Not very helpful. The full trace showed "UnicodeEncodeError: character...
Regex - how to match everything except a particular pattern
...word B. For example:
If you have a text:
1. I have a two pets - dog and a cat
2. I have a pet - dog
If you want to search for lines of text that HAVE a dog for a pet and DOESN'T have cat you can use this regular expression:
^(?=.*?\bdog\b)((?!cat).)*$
It will find only second line:
2. I have ...
Renaming files in a folder to sequential numbers
...
Beauty in one line:
ls -v | cat -n | while read n f; do mv -n "$f" "$n.ext"; done
You can change .ext with .png, .jpg, etc.
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C/C++ with GCC: Statically add resource files to executable/library
...of the executable file:
g++ foo.c -o foo0
zip -r resources.zip resources/
cat foo0 resources.zip >foo
This works, because a) Most executable image formats don't care if there's extra data behind the image and b) zip stores the file signature at the end of the zip file. This means, your executa...