If you know that a value is of a specific type, you can explicitly cast it to that type in order to use it in a context where that type is needed.
object value = -1;
int number = (int) value;
Console.WriteLine(Math.Abs(number));
If we tried passing value directly to Math.Abs(), we would get a ...
If you aren't sure whether a value is of the type you think it is, you can safely cast it using the as operator. If the value is not of that type, the resulting value will be null.
object value = "-1";
int? number = value as int?;
if(number != null)
{
Console.WriteLine(Math.Abs(nu...
A value will automatically be cast to the appropriate type if the compiler knows that it can always be converted to that type.
int number = -1;
object value = number;
Console.WriteLine(value);
In this example, we didn't need to use the typical explicit casting syntax because the compiler knows...
If you need to know whether a value's type extends or implements a given type, but you don't want to actually cast it as that type, you can use the is operator.
if(value is int)
{
Console.WriteLine(value + "is an int");
}
Prerequisites
The Windows version of Elasticsearch can be obtained from this link: https://www.elastic.co/downloads/elasticsearch. The latest stable release is always at the top.
As we are installing on Windows, we need the .ZIP archive. Click the link in the Downloads: section and save the file t...
class sample{
public static function add_action_func(){
//note __CLASS__ will also include any namespacing
add_action('init', array(__CLASS__, 'samp') );
}
public static function samp(){
echo 'i did something';
}
}
sample::add_a...
OpenSSL is an open source project that provides a robust, commercial-grade, and full-featured toolkit for the Transport Layer Security (TLS) and Secure Sockets Layer (SSL) protocols. It is also a general-purpose cryptography library.
The OpenSSL toolkit is licensed under an Apache-style license, wh...
A Stream of items that are in turn streamable can be flattened into a single continuous Stream:
Array of List of Items can be converted into a single List.
List<String> list1 = Arrays.asList("one", "two");
List<String> list2 = Arrays.asList("three"...
The .split() method splits a string into an array of substrings. By default .split() will break the string into substrings on spaces (" "), which is equivalent to calling .split(" ").
The parameter passed to .split() specifies the character, or the regular expression, to use for...
@org.junit.Test
public void should_$name$() {
$END$
}
Make sure to check the Shorted FQ names box when creating this template.
When you type "should" (the abbreviation),
this will add the necessary import org.junit.Test; statement at the top of the file, and this code:
@Test...
mutable modifier in this context is used to indicate that a data field of a const object may be modified without affecting the externally-visible state of the object.
If you are thinking about caching a result of expensive computation, you should probably use this keyword.
If you have a lock (for ...
Maps and keyword lists have different application. For instance, a map cannot have two keys with the same value and it's not ordered. Conversely, a Keyword list can be a little bit hard to use in pattern matching in some cases.
Here's a few use cases for maps vs keyword lists.
Use keyword lists wh...
The code listing below attempts to classify handwritten digits from the MNIST dataset. The digits look like this:
The code will preprocess these digits, converting each image into a 2D array of 0s and 1s, and then use this data to train a neural network with upto 97% accuracy (50 epochs).
"...
Initializing std::array<T, N>, where T is a scalar type and N is the number of elements of type T
If T is a scalar type, std::array can be initialized in the following ways:
// 1) Using aggregate-initialization
std::array<int, 3> a{ 0, 1, 2 };
// or equivalently
std::array<int, 3...
