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How to “perfectly” override a dict?
...nstance(_, dict) == True ? Or do you just use Mutable Mapping to construct then subclass?
– Andy Hayden
Mar 19 '14 at 0:01
5
...
When is memoization automatic in GHC Haskell?
...ct $ unlines . (show . map f . read) . lines; compile with or without -O2; then echo 1 | ./main. If you write a test like main = print (f 5), then y can be garbage collected as it is used and there is no difference between the two fs.
– Reid Barton
Oct 17 '10 ...
iOS: Modal ViewController with transparent background
...
modalViewController.modalPresentationStyle = UIModalPresentationCustom;
Then you have to implement two protocol methods
- (id<UIViewControllerAnimatedTransitioning>)animationControllerForPresentedController:(UIViewController *)presented presentingController:(UIViewController *)presenting s...
What is the easiest way to duplicate an activerecord record?
..._record = old_record.clone
#rails >= 3.1
new_record = old_record.dup
Then you can change whichever fields you want.
ActiveRecord overrides the built-in Object#clone to give you a new (not saved to the DB) record with an unassigned ID.
Note that it does not copy associations, so you'll have to...
The communication object, System.ServiceModel.Channels.ServiceChannel, cannot be used for communicat
...erything's fine
}
else
{
// channel faulted - re-create your client and then try again
}
If it is, all you can do is dispose of it and re-create the client side proxy again and then try again
share
|
...
wkhtmltopdf: cannot connect to X server
...
/usr/local/bin/wkhtmltopdf http://www.google.com test.pdf
If it works, then you are done. If you get the error "Cannot connect to X server" then continue to number 7.
We need to run it headless on a 'virtual' x server. We will do this with a package called xvfb.
sudo apt-get install xvfb
We n...
What is a good use case for static import of methods?
...ndling this. If you never would have dreamed of extending some.package.DA, then this is probably a poor use of static imports. Don't use it just to save a few characters when typing.
Import individual members. Say import static some.package.DA.save instead of DA.*. That will make it much easier to f...
Should I put the Google Analytics JS in the or at the end of ?
...lding up the tracking code. If a visitor to your site hits the
page, and then leaves it before the tracking code fires the Pageview,
then you lose that visitor. They now become a new direct visit to
whatever page of the site they landed on. This can make all sorts of
data on your site incorr...
Is it possible to change the location of packages for NuGet?
...s are relative to the solution so if your projects are at different levels then it won't work.
– Nine Tails
Jul 21 '15 at 15:49
2
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How to check if hex color is “too black”?
...
You have to extract the three RGB components individually, and then use a standard formula to convert the resulting RGB values into their perceived brightness.
Assuming a six character colour:
var c = c.substring(1); // strip #
var rgb = parseInt(c, 16); // convert rrggbb to dec...