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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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Select datatype of the field in postgres
...ust way to write that WHERE clause considers that possibility: where table_catalog = ? and table_schema = ? and table_name = ?; But this information_schema view doesn't consider that the DDL might have used domains.
– Mike Sherrill 'Cat Recall'
Mar 20 '15 at 16...