¿Cómo utilizar clases de enumeración en lugar de tipos de enumeración?

How to use enum classes instead of enum types?

Enum Alternatives in C# CardType.cs. Sample Enumeration class in eShopOnContainers. SmartEnum. Ardalis – Classes to help produce strongly typed smarter enums in .NET.

If you have an enum member and need its name or value: Having two enum members with the same name is invalid: >>> class Shape(Enum): SQUARE = 2 SQUARE = 3 Traceback (most recent call last): TypeError: Attempted to reuse key: ‘SQUARE’ However, two enum members are allowed to have the same value.

you can use to pass int as extras then pull it from enum using its value. I like simple. The Fred activity has two modes — HAPPY and SAD. Create a static IntentFactory that creates your Intent for you. Pass it the Mode you want. The IntentFactory uses the name of the Mode class as the name of the extra.

– Oderik Mar 22 ’13 at 12:45 The fact that in general cases (such as db storage), ordinal () is not safe is not relevant for Android parcels. Parcels are not for long-term (persistent) storage. They die with the app. So when you add/rename an enum, you’ll get new parcels. – noamtm Jun 14 ’16 at 13:01 You can pass an enum through as a string.

The enum declaration defines a class (called an enum type ). The enum class body can include methods and other fields. The compiler automatically adds some special methods when it creates an enum. For example, they have a static values method that returns an array containing all of the values of the enum in the order they are declared.

Enumify implements .toString (): Enumify sets up two static properties – .enumKeys and .enumValues: It provides the inheritable static method .enumValueOf (): And it implements inheritable iterability:

The enum pattern and Enumify are based on public static fields. Support for them currently looks as follows: MDN lists support for public static fields in various JavaScript engines. Babel has the plugin plugin-proposal-class-properties for public static fields.

Technically one could indeed view enums as a class with a bunch of typed constants, and this is in fact how enum constants are implemented internally. Using an enum however gives you useful methods ( Enum javadoc) that you would otherwise have to implement yourself, such as Enum.valueOf.

Using enums for control flow or more robust abstractions can be a code smell. This type of usage leads to fragile code with many control flow statements checking values of the enum. Instead, you can create Enumeration classes that enable all the rich features of an object-oriented language.

The enum constants are always public static final by default. When an enum class is created, the compiler will also create instances (objects) of each enum constants. In the above example, we have created an enum class Size. It has four constants SMALL, MEDIUM, LARGE and EXTRALARGE.

If we use typedef directly when declaring the enum, we can omit the tag name and then use the type without the enum keyword: But in this latter case we cannot use it as enum color, because we didn’t use the tag name in the definition. One common convention is to use both, such that the same name can be used with or without enum keyword.

Recently I picked up the habit of typedef ing various types within template classes, as is done in the standard library. For example, a container class might look something along the lines of:

The first is to use a tag name just after the enum keyword. This enumeration must then always be used with the keyword and the tag like this: If we use typedef directly when declaring the enum, we can omit the tag name and then use the type without the enum keyword: