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What is an example of the Liskov Substitution Principle?
...o base classes must be
able to use objects of derived classes
without knowing it.
At its heart LSP is about interfaces and contracts as well as how to decide when to extend a class vs. use another strategy such as composition to achieve your goal.
The most effective way I have seen to illustr...
Android - styling seek bar
...
Google have made this easier in SDK 21. Now we have attributes for specifying the thumb tint colors:
android:thumbTint
android:thumbTintMode
android:progressTint
http://developer.android.com/reference/android/widget/AbsSeekBar.html#attr_android:thumbTint
http://...
What does the [Flags] Enum Attribute mean in C#?
...the runtime performance of this, but all the same, I do think its nice to know that this isn't going to be inserting bitshifts anywhere you use the enum. More of a 'that's neat' thing rather than anything related to performance
– Orion Edwards
Feb 15 '13 at 19:...
When do I really need to use atomic instead of bool? [duplicate]
...ult (the constraints are a bit more complicated, but that's sufficient for now).
You can deal with each of these three problems on your own by making assumptions about how the types you are using are implemented, by explicitly flushing caches, and by using compiler-specific options to prevent reord...
Django CharField vs TextField
...ike maybe the body of a blog) but are meant to hold large chunks of text. Now most of this depends on the DB Engine and like in Postgres it does not matter.
Even if it does not matter, if you use ModelForms you get a different type of editing field in the form. The ModelForm will generate an HTML...
Displaying better error message than “No JSON object could be decoded”
...ew error message format. I don’t have time to track exact releases right now however.
– Martijn Pieters♦
Mar 14 at 0:29
1
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How can I transition height: 0; to height: auto; using CSS?
...
Now it does: jsfiddle.net/gNDX3/1 Basically you need to style your elements according to what you need. There is no silver bullet or widget like behavior in CSS/HTML.
– dotnetCarpenter
A...
Unicode, UTF, ASCII, ANSI format differences
...e encoded as surrogate pairs. These used to be relatively rarely used, but now many consumer applications will need to be aware of non-BMP characters in order to support emojis.
UTF-8: Variable length encoding, 1-4 bytes per code point. ASCII values are encoded as ASCII using 1 byte.
UTF-7: Usually ...
Importing CSV with line breaks in Excel 2007
...ng what you have got already in your clipboard) --> automagically works now.
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Can't install RMagick 2.13.1. Can't find MagickWand.h.
....h There are no workarounds. It looks like sticking with ImageMagick 6 for now.
On Mac OS X (I tested on Sierra), I used HomeBrew's versions tap like:
brew tap homebrew/versions
brew install imagemagick@6
Then, use the path shown on above installation:
PKG_CONFIG_PATH=/usr/local/opt/imagemagick...