22,860 questions
0
votes
1
answer
69
views
A generic method for judge whether some parameter are attributes of one of enum value in an enum class
When I'm developing a SpringBoot project, I find that I'm often need to write code to judge whether the parameters from the API are my expected attribute of the enum value or not.
Such as:
@Getter
...
- 760k
0
votes
3
answers
54
views
Avoiding Numerous Declarations
I'm writing a class that is dependent on months and how many days each month has. At the beginning of my class, I've written:
static final int JAN = 1;
static final int FEB = 2;
...
static ...
- 347k
2226
votes
15
answers
1.1m
views
Comparing Java enum members: == or equals()?
I know that Java enums are compiled to classes with private constructors and a bunch of public static members. When comparing two members of a given enum, I've always used .equals(), e.g.
public ...
- 347k
Advice
0
votes
0
replies
23
views
Is it possible to generate string fields and const classes from nullable open enums in an OpenAPI spec?
I'm trying to generate a C# client from the OpenRouter OpenAPI spec:
https://github.com/OpenRouterTeam/typescript-sdk/blob/main/.speakeasy/in.openapi.yaml
Among other things there are some enums ...
- 1
1
vote
1
answer
104
views
Avoid boxing of generic enum type
Given the base class:
public abstract class EnumType<TEnum, TValue>
where TEnum : struct, IConvertible
where TValue : struct
{
public abstract TEnum GetEnumValue(TValue value);
}
...
- 78.5k
260
votes
22
answers
317k
views
Enums in Javascript with ES6
I'm rebuilding an old Java project in Javascript, and realized that there's no good way to do enums in JS.
The best I can come up with is:
const Colors = {
RED: Symbol("red"),
BLUE: ...
- 362
4419
votes
35
answers
1.1m
views
How can I enumerate an enum?
How can you enumerate an enum in C#?
E.g., the following code does not compile:
public enum Suit
{
Spades,
Hearts,
Clubs,
Diamonds
}
public void EnumerateAllSuitsDemoMethod()
{
...
- 3,950
149
votes
1
answer
116k
views
Python, what's the Enum type good for?
In Python 3.4, we got an Enum lib in the standard library: enum. We can get a backport for enum that works with Python 2.4 to 2.7 (and even 3.1 to 3.3), enum34 in pypi.
But we've managed to get along ...
- 46.8k
2
votes
3
answers
175
views
Can enum values be redeclared?
The C++ Coding guidelines, Enum.3: Prefer class enums over “plain” enums contains following example:
void Print_color(int color);
enum Web_color { red = 0xFF0000, green = 0x00FF00, blue = 0x0000FF };
...
- 3,482
0
votes
1
answer
236
views
Java style enums in C++
In Java, I can work with enums like classes. For example, I can create enum's constructor that take a value and init enum's value and class static function values() to list all enum's values.
How to ...
- 760k
0
votes
2
answers
1k
views
Proper way to add enum class to metaObject Qt 5.15
I'm tinkering a bit with Qt's meta-object system, and I've come across an issue with adding enum class to a meta-object. I have a struct that contain some variables, one of which is an enum class.
#...
- 8,795
63
votes
6
answers
47k
views
Does Perl have an enumeration type?
Does Perl have an enumeration type that adheres to best practices, or maybe more importantly, does it need one?
The project I am working one uses strings all over the place to denote things that ...
- 3,508
0
votes
2
answers
154
views
Any Clang diagnostic flag for preventing casting an invalid int value to an enum in C?
Clang's -Wassign-enum diagnostic flag will trigger a warning when using an int whose value is out of scope of an enum's cases:
typedef enum Foo {
FooA,
FooB,
} Foo;
void handleFoo(Foo foo);
...
- 17.6k
6
votes
6
answers
5k
views
can Enum contains other Enum?
Can Enum contains other Enum elements along with its own elements ?
public enum CardSuit
{
spades,
hearts,
diamonds,
clubs
}
public enum GameSuit
{
spades, // These ...
- 5,374
14
votes
3
answers
16k
views
What are commonly-used ways to iterate over an enum class in C++?
I am finding that all of my standard techniques for iterating over regular enums unfortunately do NOT work on enum classes since enum classes do not implicitly convert to integers.
NOT a duplicate of ...
- 19
2
votes
4
answers
177
views
What the best way to self-document "codes" in a SQL based application?
Is there any way to implement self-documenting enumerations in "standard SQL"?
EXAMPLE:
Column: PlayMode
Legal values: 0=Quiet, 1=League Practice, 2=League Play, 3=Open Play, 4=...
- 20.2k
7
votes
4
answers
7k
views
How can I display an enum in lowercase?
I have an enum:
pub enum BoxColour {
Red,
Blue,
}
I not only want to get this value as a string, but I want the value to be converted to lower case.
This works:
impl Display for BoxColour {
...
- 103
2
votes
3
answers
6k
views
Creating C-like Enum in Python
I'm trying to reproduce the following C enumeration list in Python:
enum Id
{
NONE = 0,
HEARTBEAT, //0x1
FLUID_TRANSFER_REQUEST,
FLUID_TRANSFER_STATUS_MSG,
FLUID_TRANSFER_ERROR_MSG,
...
- 24.2k
1
vote
0
answers
49
views
Static typing for an `Enum` that contains compiled regex patterns
I am in a scenario (that could be compared to writing an AST) where I compile multiple regex patterns that I want to reuse later, and for the sake of simplicity and readability I want to store them in ...
- 628
0
votes
5
answers
3k
views
TypeScript Enum alternative following the use of --erasableSyntaxOnly flag
TypeScript has added the erasableSyntaxOnly flag, that doesn't let you use Enums.
Have looked for several alternative options. Like:
What's the best practice to implement an alternative to ...
- 21
3
votes
1
answer
70
views
Trying to reduce the verboseness of __post_init__ in a python dataclass
I am writing a Python config script that creates an array of input files in a domain-specific language (DSL), so my use case is a bit unusual. In this scenario, we want medium-level users to be able ...
- 628
1
vote
1
answer
116
views
Enum object with guaranteed no duplicate values
I've been using this enum alternative composition:
const makeEnum = <const O extends Record<string, string>>(obj: O) => {
return {
map: obj,
values: (Object.keys(obj)...
- 339k
2
votes
2
answers
157
views
Niche optimization: why is `size_of::<Result<bool, bool>>()` 2 instead of 1?
Niche optimization allows Rust to store data in the invalid bit patterns of a type. The only valid values of a bool are 0 and 1 (one bit). And Result only has two variants (one bit). So why does ...
- 27.1k
44
votes
4
answers
83k
views
Creating enums with lombok
I am using project lombok with my application. I was creating an enum. If I use
@AllArgsConstructor
annotation with my enum, it doesn't recognise the constructor, enum throws and error that it ...
- 49.1k
3
votes
2
answers
292
views
FastAPI: How to generate a readable scheme from IntEnum in openapi.json with the correct keys, not digital ones?
My IntEnum class:
class Role(IntEnum):
client = 1
manager = 2
admin = 3
What I got in generated openapi.json:
{
enum: [1, 2, 3],
title: "Role",
type: "integer"
}
...
- 1,003