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Difference between Covariance & Contra-variance
...th highly substitutable types. The key to get this consistency is sub type based conformance, if you work in a statically typed language. (We'll discuss the Liskov Substitution Principle (LSP) on a high level here.)
Practical examples (pseudo code/invalid in C#):
Covariance: Let's assume Birds ...
resizes wrong; appears to have unremovable `min-width: min-content`
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What is private bytes, virtual bytes, working set?
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Understanding the Use of ColorMatrix and ColorMatrixColorFilter to Modify a Drawable's Hue
...;jared.rummler@gmail.com>
*/
public class ColorFilterGenerator {
// Based off answer from StackOverflow
// See: http://stackoverflow.com/a/15119089/1048340
private ColorFilterGenerator() {
throw new AssertionError();
}
public static From from(Drawable drawable) {
return new ...
How to detect when an Android app goes to the background and come back to the foreground
...ssuming you have YourApplication and the MemoryBoss classes, in your class BaseActivity extends Activity (you will need to create one if you don't have one).
@Override
protected void onStart() {
super.onStart();
if (mApplication.wasInBackground()) {
// HERE YOU CALL THE CODE YOU WA...
What are some compelling use cases for dependent method types?
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Are PDO prepared statements sufficient to prevent SQL injection?
...ting this answer to talk about PDO...
The long answer isn't so easy. It's based off an attack demonstrated here.
The Attack
So, let's start off by showing the attack...
$pdo->query('SET NAMES gbk');
$var = "\xbf\x27 OR 1=1 /*";
$query = 'SELECT * FROM test WHERE name = ? LIMIT 1';
$stmt = $pd...
Why not use always android:configChanges=“keyboardHidden|orientation”?
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Understanding the meaning of the term and the concept - RAII (Resource Acquisition is Initialization
...ost everything fits right in terms of RAII: exception safety, mutexes, database connections, database requests, server connection, clocks, OS handles, etc., and last, but not least, memory.
The database part is not negligible, as, if you accept to pay the price, you can even write in a "transaction...
Why use prefixes on member variables in C++ classes
... Form to find an event - you have to scroll through hundreds of mysterious base class methods that you will never need to call to find the events. But if every event had an "e" prefix, they would automatically be listed in a group under "e". Thus, prefixing works to group the members, consts, events...