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Defining an abstract class without any abstract methods
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Of course.
Declaring a class abstract only means that you don't allow it to be instantiated on its own.
Declaring a method abstract means that subclasses have to provide an implementation for that method.
The two are separate concepts, though obviously you can't have an abstract method ...
How to export revision history from mercurial or git to cvs?
...en we finish or maybe every once in a while we want to commit our code and all of our revision history to cvs. We don't have write access to the project's cvs repo so we can't commit very frequently. What tool can we use to export our revision history to cvs? Currently we were thinking of using git ...
Jump to matching XML tags in Vim
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There is a vim plugin called matchit.vim . You can find it here: http://www.vim.org/scripts/script.php?script_id=39 . It was created pretty much the exact purpose you describe.
Install that, place your cursor on the body of the tag (not the <&g...
Git - Pushing code to two remotes [duplicate]
...hes. However, you may add multiple pushurls for a given remote, which then allows you to push to multiple remotes using a single git push. You can verify this behavior below:
$ git clone git://original/repo.git
$ git remote -v
origin git://original/repo.git (fetch)
origin git://original/repo.git ...
PHP json_encode encoding numbers as strings
...e of the json_encode() function is a string. Regarding the MySQL returning all fields as strings, yes I have also encountered this specifically with PDO. The way I see it you should always cast values you expect to be numeric to integer (or float) in PHP to make sure, do not trust MySQL or any other...
How to pipe stdout while keeping it on screen ? (and not to a output file)
... /dev/tty | tee -a other.log | grep -i 'foo' >> foo.log to 1) get it all to the console, 2) get it all appended to another file, 3) get the foo lines to a different file.
– Jesse Chisholm
Mar 9 '17 at 16:05
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Swift performSelector:withObject:afterDelay: is unavailable [duplicate]
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Swift is statically typed so the performSelector: methods are to fall by the wayside.
Instead, use GCD to dispatch a suitable block to the relevant queue — in this case it'll presumably be the main queue since it looks like you're doing ...
how to exclude null values in array_agg like in string_agg using postgres?
...NC = fn_array_agg_notnull,
STYPE = ANYARRAY,
INITCOND = '{}'
);
Calling the second is (naturally) a little nicer looking than the first:
select array_agg_notnull(v) from x;
share
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im...
String vs. StringBuilder
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I like this answer a lot, especially the advice to code for clarity before performance. As developers, we spend as much or more time reading code as we do writing it.
– Scott Lawrence
Sep 16 '08 at 18:18
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Putting a simple if-then-else statement on one line [duplicate]
I'm just getting into Python and I really like the terseness of the syntax. However, is there an easier way of writing an if - then - else statement so it fits on one line?
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