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Is #pragma once a safe include guard?
...ine. The one caveat is that GCC didn't support #pragma once before version 3.4.
I also found that, at least on GCC, it recognizes the standard #ifndef include guard and optimizes it, so it shouldn't be much slower than #pragma once.
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How can I validate a string to only allow alphanumeric characters in it?
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183
Use the following expression:
^[a-zA-Z0-9]*$
ie:
using System.Text.RegularExpressions;
Rege...
How to add multiple columns to a table in Postgres?
...o I add multiple columns in one query statement in PostgreSQL using pgadmin3?
2 Answers
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Javascript object Vs JSON
... alert('hello');
}
}); // returns the string "{"foo":"2011-11-28T10:21:33.939Z"}"
For parsing a JSON string, is the method below recommended? var javascriptObj = JSON.parse(jSonString);
Yes, but older browsers don't support JSON natively (IE <8). To support these, you should include jso...
Are static fields open for garbage collection?
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113
Static variables cannot be elected for garbage collection while the class is loaded. They can be...
How to select first and last TD in a row?
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383
You could use the :first-child and :last-child pseudo-selectors:
tr td:first-child,
tr td:las...
Random row selection in Pandas dataframe
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jpp
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answered Apr 10 '13 at 10:55
eumiroeumiro
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How to find if div with specific id exists in jQuery?
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553
You can use .length after the selector to see if it matched any elements, like this:
if($("#" +...
Is it possible to center text in select box?
I tried this: http://jsfiddle.net/ilyaD/KGcC3/
20 Answers
20
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Git alias with positional parameters
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371
The most obvious way is to use a shell function:
[alias]
files = "!f() { git diff --name-...