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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-...
Is it possible to figure out the parameter type and return type of a lambda?
...
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...
C# DLL config file
...
Background: I want to have my DAL.dll to have its own config file for database and DAL settings. I also need the app.config for Enterprise Library and its own configurations. So I need both the app.config and dll.config.
What I did not wanted to do is pass-through every property/setting from the a...
Getting individual colors from a color map in matplotlib
...at value, we can do
rgba = cmap(0.5,bytes=True)
So to simplify the code based on answer from Ffisegydd, the code would be like this:
#import colormap
from matplotlib import cm
#normalize item number values to colormap
norm = matplotlib.colors.Normalize(vmin=0, vmax=1000)
#colormap possible val...