enums

问题 I am currently working on a Swagger documentation for Ruby on Rails API. The API has lots of enumerators (enums) which are included in various models. The enums are stored as hashes and not arrays in the app/models/concerns directory so that they can be modified without issues later. State Enum (state.rb) module State extend ActiveSupport::Concern included do enum state: { state1: 'State 1', state2: 'State 2', state3: 'State 3', state4: 'State 4', state5: 'State 5' } end end However, when I

问题 I am currently working on a Swagger documentation for Ruby on Rails API. The API has lots of enumerators (enums) which are included in various models. The enums are stored as hashes and not arrays in the app/models/concerns directory so that they can be modified without issues later. State Enum (state.rb) module State extend ActiveSupport::Concern included do enum state: { state1: 'State 1', state2: 'State 2', state3: 'State 3', state4: 'State 4', state5: 'State 5' } end end However, when I

问题 I have this struct below struct foo { char *name; int (*validate)(u8_t *data, size_t size); u8_t value; u8_t changed; foo_id id; }; typedef struct foo foo_t; I wish I to create an array of foo_t in compiling time through defines, like this: int my_validate(u8_t *data, size_t size) {...} FOO_CREATE(my_name, my_validate, 0, 0); FOO_CREATE(my_name2, NULL, 0, 0); and in compiling time the result be: enum { MY_NAME_FOO = 0, MY_NAME2_FOO, FOO_COUNT } foo_id; static foo_t foo[FOO_COUNT] = { { .name

问题 I have C API defined like this: typedef enum Foo { A = 0, B = 1 } Foo; typedef struct Bar { int a; Foo foo; } Bar; How can I use Foo enum in Swift directly? I know, that I can do var data: Foo = A , but I dont like this syntax, where A seems to be some global variable. I would rather have var data: Foo = Foo.A or something similar like with standard enums. Is there a way? 回答1: C enumerations are imported into Swift as an enum if they are defined via the NS_ENUM or CF_ENUM macro, see for

问题 Enum is basically a special class type, and can have methods and fields just like any other class. Any one know about the Enums Template Methods. Please give a real example for Template Methods on Enums. And can you explain about Enum Reverse Lookups. 回答1: Java 5.0 Enum tricks, specially have a look on the video. Here is a simple example of a "command" enumeration: public enum Toy { DOLL() { @Override public void execute() { System.out.println("I'm a doll."); } }, SOLDIER() { @Override public

问题 Why is it that, in Powershell, the System.DayOfWeek enum can be referred to like [System.DayOfWeek] , whereas the System.Environment.SpecialFolder enum must be referred to like [System.Environment+SpecialFolder] (note the plus character)? My guess is because SpecialFolder is part of the static Environment class and DayOfWeek is sitting directly in the System namespace, but I'm having trouble finding any information on this. Normally static members would use the "static member operator", but

问题 i have a question about enums that the codes are below: namespace space { public enum MyEnums { Enum1,Enum2,... } } namespace space { public class MyClass { public enum MyEnums { Enum1,Enum2,... } } } whats difference and how to use them? 回答1: Well syntactically the only difference is that you'd preface the enum type with the containing class: MyClass.MyEnums.Enum1 versus just MyEnums.Enum1 (in both cases the namespace is assumed to be covered with a using directive) However, containing it

问题 I have a model class of which I want two fields to be a choice fields, so to populate those choices I am using an enum as listed below #models.py class Transaction(models.Model): trasaction_status = models.CharField(max_length=255, choices=TransactionStatus.choices()) transaction_type = models.CharField(max_length=255, choices=TransactionType.choices()) #enums.py class TransactionType(Enum): IN = "IN", OUT = "OUT" @classmethod def choices(cls): print(tuple((i.name, i.value) for i in cls))

问题 In Python, you can use the Flag class to represent combinations of values. class Color(Flag): Red = auto() Green = auto() Blue = auto() White = Red | Green | Blue These implicitly convert to strings so you can print them. >>> print(Color.Red, Color.White, Color.Red|Color.Green) Color.Red Color.White Color.Green|Red The name property gives you can even nicer way to print, but it doesn't work for unnamed combined values. >>> print(Color.Red.name, Color.White.name, (Color.Red|Color.Green).name)

问题 I must write the value from the enum enumeration to the database. An error occurs during compilation. What am I doing wrong? Cannot figure out how to save this field into database. You can consider adding a type converter for it. @ColumnInfo(name = "state_of_health") @TypeConverters(HealthConverter::class) var health: Health enum class Health(val value: Int){ NONE(-1), VERY_BAD(0), ... } class HealthConverter{ @TypeConverter fun fromHealth(value: Health): Int{ return value.ordinal }