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When should I use the Visitor Design Pattern? [closed]
... a new feature, they would need to add that method to every feature in the base class. This is particularly hard when the base classes appear in a separate library, or are produced by a separate team.
(I have heard it argued that the Visitor pattern is in conflict with good OO practices, because it...
Running a cron every 30 seconds
... executing the "meat" of the job, /path/to/executable.
For other (non-cron-based) options, see the other answers here, particularly the ones mentioning fcron and systemd. These are probably preferable assuming your system has the ability to use them (such as installing fcron or having a distro with ...
git --git-dir not working as expected
...d ../..; git grep foo)
for d in d1 d2 d3; do (cd $d && git svn rebase); done
The methods shown above are acceptable for scripting but are too cumbersome for quick command line invocations.
With this new option, the above can be done with fewer keystrokes:
git -C ~/foo ...
Detecting that the browser has no mouse and is touch-only
...at works smoothly no matter the context of the user. Then make assumptions based on browser features/media queries to add functionality that will be relative in the assumed context. Presence of a mouse is just one of the multitudes of ways in which different users on different devices experience you...
conditional unique constraint
...HECK constraint "CheckActiveCountConstraint". The conflict occurred in database "TestSchema", table "dbo.CheckConstraint".
INSERT INTO CheckConstraint VALUES (2, 'Oh no!', 1);
SELECT * FROM CheckConstraint;
-- Id Name RecordStatus
-- ---- ------------ ------------
-- 1 No Problems 2
-...
What components are MVC in JSF MVC framework?
...nput from the user and instructs the model and viewport to perform actions based on that input." I doubt that FacesServlet "instructs the model", does it?
– yegor256
Feb 24 '11 at 12:13
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The purpose of Model View Projection Matrix
...u think of it deeply, you'll realise that eventhough the transformation is based on an object's origin (i.e. single point), all the vertices of the object (mesh/model formally) will undergo the transformation i.e. all 1000 vertices will be multiplied by the model matrix. Hence your point isn't well-...
Some questions about Automatic Reference Counting in iOS5 SDK
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@Brad The install base for iOS4 is already more than 95%. I think it's save to drop iOS3 support anyway.
– Henrik P. Hessel
Jun 20 '11 at 22:01
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Is it possible to figure out the parameter type and return type of a lambda?
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Funny, I've just written a function_traits implementation based on Specializing a template on a lambda in C++0x which can give the parameter types. The trick, as described in the answer in that question, is to use the decltype of the lambda's operator().
template <typename T&g...
How do I provide custom cast support for my class?
..., why, the compiler only looks for implicit/explicit casts at compile time based upon their compiled type. In this case the compiler sees name as an object rather than string, and thus doesn't use Role's overloaded operator.
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