It's important to let finalization ignore managed resources. The finalizer runs on another thread -- it's possible that the managed objects don't exist anymore by the time the finalizer runs. Implementing a protected Dispose(bool) method is a common practice to ensure managed resources do not have t...
git config --global merge.conflictstyle diff3
Sets the diff3 style as default: instead of the usual format in conflicted sections, showing the two files:
<<<<<<< HEAD
left
=======
right
>>>>>>> master
it will include an additional section containi...
It is undefined behavior to access an index that is out of bounds for an array (or standard library container for that matter, as they are all implemented using a raw array):
int array[] = {1, 2, 3, 4, 5};
array[5] = 0; // Undefined behavior
It is allowed to have a pointer pointing to the en...
In Swift, structures use a simple “dot syntax” to access their members.
For example:
struct DeliveryRange {
var range: Double
let center: Location
}
let storeLocation = Location(latitude: 44.9871,
longitude: -93.2758)
var pizzaRange = DeliveryRange(range: 200...
Sometimes, programmers who are new Java will use primitive types and wrappers interchangeably. This can lead to problems. Consider this example:
public class MyRecord {
public int a, b;
public Integer c, d;
}
...
MyRecord record = new MyRecord();
record.a = 1; // OK
...
Using the Android API 23 or higher, very often such situation can be seen:
This situation is caused by the structural change of the Android API regarding getting the resources.
Now the function:
public int getColor(@ColorRes int id, @Nullable Theme theme) throws NotFoundException
should ...
The dexcount plugin counts methods and class resource count after a successful build.
Add the plugin in the app/build.gradle:
apply plugin: 'com.android.application'
buildscript {
repositories {
mavenCentral() // or jcenter()
}
dependencies {
classpath 'com.ge...
A reference is a scalar variable (one prefixed by $ ) which “refers to” some other data.
my $value = "Hello";
my $reference = \$value;
print $value; # => Hello
print $reference; # => SCALAR(0x2683310)
To get the referred-to data, you de-reference it.
say ${$reference}...
Array References are scalars ($) which refer to Arrays.
my @array = ("Hello"); # Creating array, assigning value from a list
my $array_reference = \@array;
These can be created more short-hand as follows:
my $other_array_reference = ["Hello"];
Modifying / Using array ref...
If you need to roll for a true or false in an "x% chance" situation, use:
function roll(chance:Number):Boolean {
return Math.random() >= chance;
}
Used like:
var success:Boolean = roll(0.5); // True 50% of the time.
var again:Boolean = roll(0.25); // True 25% of the time.
...
When running from the CLI, PHP exhibits some different behaviours than when run from a web server. These differences should be kept in mind, especially in the case where the same script might be run from both environments.
No directory change When running a script from a web server, the current w...
Access ModifierVisibilityInheritancePrivateClass onlyCan't be inheritedNo modifier / PackageIn packageAvailable if subclass in packageProtectedIn packageAvailable in subclassPublicEverywhereAvailable in subclass
There was once a private protected (both keywords at once) modifier that could be appli...
Here is how to make a Heads Up Notification for capable devices, and use a Ticker for older devices.
// Tapping the Notification will open up MainActivity
Intent i = new Intent(this, MainActivity.class);
// an action to use later
// defined as an app constant:
// public static final String ME...
To access pixel values in an OpenCV cv::Mat object, you first have to know the type of your matrix.
The most common types are:
CV_8UC1 for 8-bit 1-channel grayscale images;
CV_32FC1 for 32-bit floating point 1-channel grayscale images;
CV_8UC3 for 8-bit 3-channel color images; and
CV_32FC3 ...
One of the more popular .NET providers for Postgresql is Npgsql, which is ADO.NET compatible and is used nearly identically as other .NET database providers.
A typical query is performed by creating a command, binding parameters, and then executing the command. In C#:
var connString = "Host=m...
In this example, we modify the "Simple class" example to allow access to the speed property. Typescript accessors allow us to add additional code in getters or setters.
class Car {
public position: number = 0;
private _speed: number = 42;
private _MAX_SPEED = 100
...
A resource is a special type of variable that references an external resource, such as a file, socket, stream, document, or connection.
$file = fopen('/etc/passwd', 'r');
echo gettype($file);
# Out: resource
echo $file;
# Out: Resource id #2
There are different (sub-)types of resource. Y...
There are situations when you need to calculate something really large in your Flash application, while not interrupting the user's experience. For this, you need to devise your lengthy process as a multi-step process with saved state between iterations. For example, you need to perform a background...
