For some use cases, you can use the using syntax to help define a custom scope. For example, you can define the following class to execute code in a specific culture.
public class CultureContext : IDisposable
{
private readonly CultureInfo originalCulture;
public CultureContext(string ...
.default-settings() {
padding: 4px;
margin: 4px;
font-size: 16px;
border: 1px solid gray;
}
#demo {
.default-settings;
}
The above example when compiled would only produce the following output. The .default-settings() mixin definition would not be output in the compiled CSS fi...
An interface is declared like a class, but without access modifiers (public, private, ...). Also, no definitions are allowed, so variables and constants can't be used.
Interfaces should always have an Unique Identifier, which can be generated by pressing Ctrl + Shift + G.
IRepository = interface
...
The most important consequence of the One Definition Rule is that non-inline functions with external linkage should only be defined once in a program, although they can be declared multiple times. Therefore, such functions should not be defined in headers, since a header can be included multiple tim...
SoundEffect.Play() plays the sound effect in a "fire-and-forget" fashion. The sound plays once and its lifetime is managed by the framework. You are not able to change the properties (volume, pan, pitch) of the sound during playback, loop it, position it in 3D or pause it.
You can hold a ...
A defer statement consists of a block of code, which will be executed when a function returns and should be used for cleanup.
As Swift's guard statements encourage a style of early return, many possible paths for a return may exist. A defer statement provides cleanup code, which then does not need ...
When using a defer-statement, make sure the code remains readable and the execution order remains clear. For example, the following use of the defer-statement makes the execution order and the function of the code hard to comprehend.
postfix func ++ (inout value: Int) -> Int {
defer { value...
ActiveRecord includes default_scope, to automatically scope a model by default.
class Post
default_scope ->{ where(published: true).order(created_at: :desc) }
end
The above code will serve posts which are already published when you perform any query on the model.
Post.all # will only lis...
In order to be able to use a class as the key in a map, all that is required of the key is that it be copiable and assignable.
The ordering within the map is defined by the third argument to the
template (and the argument to the constructor, if used). This
defaults to std::less<KeyType>, w...
Typed holes can make it easier to define functions, through an interactive process.
Say you want to define a class instance Foo Bar (for your custom Bar type, in order to use it with some polymorphic library function that requires a Foo instance). You would now traditionally look up the documentati...
First define an ExitActivity in the AndroidManifest.xml
<activity
android:name="com.your_example_app.activities.ExitActivity"
android:autoRemoveFromRecents="true"
android:theme="@android:style/Theme.NoDisplay" />
Afterwards the ExitA...
Sometimes it may be useful to have a specific asBoolean definition in your own program for some kind of objects.
/** an oversimplified robot controller */
class RunController {
def complexCondition
int position = 0
def asBoolean() {
return complexCondition(this...
Quick start
A rule describes when and how certain files (rule's targets) are created. It can also serve to update a target file if any of the files required for its creation (target's prerequisites) are newer than the target.
Rules follow the syntax below: (Note that commands following a rule are ...
The change the definition of a db column, the query below can be used for example, if we have this db schema
users (
firstname varchar(20),
lastname varchar(20),
age char(2)
)
To change the type of age column from char to int, we use the query below:
ALTER TABLE users CHANGE age...
You can create and configure build types in the module-level build.gradle file inside the android {} block.
android {
...
defaultConfig {...}
buildTypes {
release {
minifyEnabled true
proguardFiles getDefaultProguar...
