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Selectors in Objective-C?
First, I'm not sure I really understand what a selector is. From my understanding, it's the name of a method, and you can assign it to a class of type 'SEL' and then run methods such as respondToSelector to see if the receiver implements that method. Can someone offer up a better explanation?
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Unix shell script to truncate a large file
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: > filename
: is a no-op in bash (POSIX-compliant), so this essentially just opens the file for writing (which of course truncates the file) and then immediately closes it.
EDIT: as shellter commented, you don't actually need a command to go along with the redirection:
$ echo foo > foo....
LINQ: “contains” and a Lambda query
I have a List<BuildingStatus> called buildingStatus . I'd like to check whether it contains a status whose char code (returned by GetCharCode() ) equals some variable, v.Status .
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How to increase scrollback buffer size in tmux?
...t (at least temporarily) changing history-limit (though show-option (especially in 1.7 and later) can help with retrieving the current value so that you restore it later).
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Java Reflection Performance
Does creating an object using reflection rather than calling the class constructor result in any significant performance differences?
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Understanding reference counting with Cocoa and Objective-C
...view to playing with the iPhone SDK. I'm reasonably comfortable with C's malloc and free concept, but Cocoa's references counting scheme has me rather confused. I'm told it's very elegant once you understand it, but I'm just not over the hump yet.
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How to git-svn clone the last n revisions from a Subversion repository?
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You've already discovered the simplest way to specify a shallow clone in Git-SVN, by specifying the SVN revision number that you want to start your clone at ( -r$REV:HEAD).
For example: git svn clone -s -r1450:HEAD some/svn/repo
Git's data structure is based on pointers in a dir...
How to have an auto incrementing version number (Visual Studio)? [duplicate]
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BTW, you don't really have to edit and add in the assembly info file. A much easier way will be to go to project properties, application tab, click on "Assembly Information" and enter major version, minor version as you like and enter * in th...
What is the difference among col-lg-*, col-md-* and col-sm-* in Bootstrap?
...a new -xl- size, see this demo. Also the -xs- infix has been removed, so smallest columns are simply col-1, col-2.. col-12, etc..
col-* - 0 (xs)
col-sm-* - 576px
col-md-* - 768px
col-lg-* - 992px
col-xl-* - 1200px
Bootstrap 4 Grid Demo
Additionally, Bootstrap 4 includes new auto-layout columns. Thes...
What are the pros and cons of the leading Java HTML parsers? [closed]
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General
Almost all known HTML parsers implements the W3C DOM API (part of the JAXP API, Java API for XML processing) and gives you a org.w3c.dom.Document back which is ready for direct use by JAXP API. The major differences are usually to b...