Questions tagged [associated-value]
34 questions
1
vote
1 answer
Generic Class with Enum with associated values
I'm trying to create a generic UITableViewCell that inherits from an enum with associated values.
This is what I tried:
Enum declaration:
enum Content: Equatable {
case text(String)
case image(UIImage)
case error(Error)
case…
Roi Mulia
- 5,626
- 11
- 54
- 105
1
vote
1 answer
Is there a clean way of making an enum with associated value conform to rawRepresentable?
I have this in my code and it works, however if I have other enums (not necessarily color) with a long list it gets tiresome. Is there a better way of having an enum with an associated value that also conforms to RawRepresentable?
public enum…
Aaron Bratcher
- 6,051
- 2
- 39
- 70
1
vote
1 answer
How to declare an `enum` of `enum` that allows for "flattened" `switch` statement?
Optional in Swift allows for magic where switch-ing over an optional enum flattens the cases into a single switch statement.
Given:
enum Foo {
case bar, baz
}
You can:
let foo: Foo? = .bar
switch foo {
case .bar:
break
case .baz:
…
Isaaс Weisberg
- 2,296
- 2
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- 28
1
vote
0 answers
Python panda multi-index dataframes: How to associate specific columns to a specific value from a new index
Python panda multi-index dataframes: How to associate specific columns to a specific value from a new index
I have meteorological data in a multi-index panda dataframe. For simplicity let’s limit the example to temperatures at different pressure…
isbjörnen
- 11
- 1
1
vote
1 answer
Swift - Nested enums - how to perform same action on all nested enums with associated values?
I want to print the raw value of nested enums. For example, if I have a top level Food enum with multiple cases (for simplicity let's just say two: fruit, veggie), each of which are string enums (Fruit: String, Vegetable: String, etc), is there a…
Nobadi
- 121
- 2
- 13
1
vote
1 answer
Unwrapping associated value for all cases in switch
I have an enum similar to this, where all cases contain the same associated value content:
enum RowType {
case single(_ content: [Any])
case double(_ content: [Any])
case triple(_ content: [Any])
...
}
I know I could just use a…
emmics
- 994
- 1
- 11
- 29
1
vote
1 answer
Enums associated values and generics
I have a enum like this, it contains different initial states:
enum InitialState {
case listTableView(ListTableViewState)
}
I want to use them like this:
var tableViewState: ListTableViewState?
let test = ListTableViewState(group: .large,…
PaFi
- 888
- 1
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1
vote
0 answers
In Swift declare protocol variable that has to conform to at least one protocol
How can I define a variable in a protocol in Swift4 that at least needs to conform to a protocol, but can also conform to other protocols as well?
For example I now get an error if the protocol declares that a variable should conform to protocol B…
Jeroen
- 11
- 3
1
vote
2 answers
How can you do a simple inline test for an enumeration's case that has associated values you don't care about?
Given this code:
class Item{}
func foo(item:Item){}
enum SelectionType{
case single(resultsHandler:(Item)->Void)
case multi(resultsHandler:([Item])->Void)
}
var selectionType:SelectionType = .single(resultsHandler:foo)
// This line won't…
Mark A. Donohoe
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0
votes
0 answers
What is a good way to retrieve the associated value from a struct's enum property when the associated value might have multiple possible types?
I have an array of structs that has been decoded from a JSON file. Each struct has a stored property that is a variable-dimension array stored in an enum associated value.
Some of the structs have property Enum.array2D([[Float]]) and others have…
whaleshark
- 65
- 6
0
votes
1 answer
Assign associated non mutable constant data to enum variants
Note:
My question is similar to this question, but doesn't seem to solve my use case.
Can enum variants have constant associated values?
Problem explanation
My server returns a country (very long list) which internally is mapped to an enum (there is…
Avba
- 14,822
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0
votes
0 answers
Using Enums’ associated values to link cases from first Enum to 2nd, then call an associated function value from the CaseIterable second
I’m building a weather app that will provide access to multiple weather providers from which I get slightly-to-very different data sets returned. I want to make the system that handles the setting up of the data to be as generic as possible to…
Barrrdi
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- 33
0
votes
1 answer
Cakephp4, how to load associated data in an Entity object?
I have a Users table and a Roles table.
A user has one role. So in UsersTable.php:
$this->belongsTo('Roles', [
'foreignKey' => 'role_id',
'joinType' => 'INNER',
]);
Now in User.php (Entity!!) I need the role name…
Ruud
- 45
- 4
0
votes
1 answer
Swift Enum How to conform to a protocol's variables' set & get?
my code:
public protocol ApiRequestBaseObjProtocol {
var param:[String:Any] { get set }
var path:String {get}
}
extension ApiRequestBaseObjProtocol {
var param: [String : Any] {
get {
var key = "\(self.path)"
…
0
votes
2 answers
Enumeration on enums with associated values - Swift
I have an enum with associated values. In addition, every value has a String description. How can I get description of all the cases?
enum MyEnum {
case caseA(data: [DataOfTypeA])
case caseB(data: [DataOfTypeB])
case caseC(data:…
Luda
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