Dart 2: How to access a class's type?
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2
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In Swift 4, I used to do something like this to locally store objects of variable classes:
class Repo {
var mediaType : MyBaseClass.Type
func doSomething() {
mediaType.someStaticMethod();
}
}
class SpecificClass : MyBaseClass {
static func someStaticMethod() -> void {
// Stuff
}
}
repo = Repo(SpecificClass.self)
repo.doSomething(); // Executes `Stuff`
Moving to Dart 2, this is the closest I've gotten, yet the error specified at the bottom is blocking me.
class Repo {
Type mediaType;
void doSomething() {
mediaType.someStaticMethod();
}
}
class SpecificClass extends MyBaseClass {
static void someStaticMethod() {
// Whatever
}
}
repo = Repo(SpecificClass)
repo.doSomething() // Should execute `Whatever`, but for the error
Which generates this error:
The method 'someStaticMethod' isn't defined for the class 'Type'
Is this sort of trick feasible with Dart 2?
dart asked Nov 11 at 18:15
Craig Labenz
1,17521112
add a comment |
up vote
2
down vote
favorite
In Swift 4, I used to do something like this to locally store objects of variable classes:
class Repo {
var mediaType : MyBaseClass.Type
func doSomething() {
mediaType.someStaticMethod();
}
}
class SpecificClass : MyBaseClass {
static func someStaticMethod() -> void {
// Stuff
}
}
repo = Repo(SpecificClass.self)
repo.doSomething(); // Executes `Stuff`
Moving to Dart 2, this is the closest I've gotten, yet the error specified at the bottom is blocking me.
class Repo {
Type mediaType;
void doSomething() {
mediaType.someStaticMethod();
}
}
class SpecificClass extends MyBaseClass {
static void someStaticMethod() {
// Whatever
}
}
repo = Repo(SpecificClass)
repo.doSomething() // Should execute `Whatever`, but for the error
Which generates this error:
The method 'someStaticMethod' isn't defined for the class 'Type'
Is this sort of trick feasible with Dart 2?
dart asked Nov 11 at 18:15
Craig Labenz
1,17521112
Instead ofType mediaType;, just useMyBaseClass mediaType;. It should work.
– tenhobi
Nov 11 at 18:19
UsingMyBaseClass mediaTypeexpects an instance ofBaseMediaType, whereas I want to pass the class itself.
– Craig Labenz
Nov 11 at 18:24
After a bit of search, it seems it is not possible in Dart: github.com/dart-lang/sdk/issues/34131
– tenhobi
Nov 11 at 18:36
It seems it's that.Typeand subsequent.selffrom Swift that are missing Dart equivalents and would seemingly easily allow for this.
– Craig Labenz
Nov 11 at 19:02
You can use something like github.com/google/built_value.dart/blob/… to pass type information and you can closurize the constructor to pass it around() => MyClass(). It's a bit more boilerplate but otherwise there is hardly anything you can't do.
– Günter Zöchbauer
Nov 11 at 20:54
add a comment |
up vote
2
down vote
favorite
up vote
2
down vote
favorite
In Swift 4, I used to do something like this to locally store objects of variable classes:
class Repo {
var mediaType : MyBaseClass.Type
func doSomething() {
mediaType.someStaticMethod();
}
}
class SpecificClass : MyBaseClass {
static func someStaticMethod() -> void {
// Stuff
}
}
repo = Repo(SpecificClass.self)
repo.doSomething(); // Executes `Stuff`
Moving to Dart 2, this is the closest I've gotten, yet the error specified at the bottom is blocking me.
class Repo {
Type mediaType;
void doSomething() {
mediaType.someStaticMethod();
}
}
class SpecificClass extends MyBaseClass {
static void someStaticMethod() {
// Whatever
}
}
repo = Repo(SpecificClass)
repo.doSomething() // Should execute `Whatever`, but for the error
Which generates this error:
The method 'someStaticMethod' isn't defined for the class 'Type'
Is this sort of trick feasible with Dart 2?
dart asked Nov 11 at 18:15
Craig Labenz
1,17521112
In Swift 4, I used to do something like this to locally store objects of variable classes:
class Repo {
var mediaType : MyBaseClass.Type
func doSomething() {
mediaType.someStaticMethod();
}
}
class SpecificClass : MyBaseClass {
static func someStaticMethod() -> void {
// Stuff
}
}
repo = Repo(SpecificClass.self)
repo.doSomething(); // Executes `Stuff`
Moving to Dart 2, this is the closest I've gotten, yet the error specified at the bottom is blocking me.
class Repo {
Type mediaType;
void doSomething() {
mediaType.someStaticMethod();
}
}
class SpecificClass extends MyBaseClass {
static void someStaticMethod() {
// Whatever
}
}
repo = Repo(SpecificClass)
repo.doSomething() // Should execute `Whatever`, but for the error
Which generates this error:
The method 'someStaticMethod' isn't defined for the class 'Type'
Is this sort of trick feasible with Dart 2?
dart dart asked Nov 11 at 18:15
Craig Labenz
1,17521112
asked Nov 11 at 18:15
Craig Labenz
1,17521112
asked Nov 11 at 18:15
Craig Labenz
1,17521112
asked Nov 11 at 18:15
Craig Labenz
1,17521112
asked Nov 11 at 18:15
Craig Labenz
1,17521112
1,17521112
Instead ofType mediaType;, just useMyBaseClass mediaType;. It should work.
– tenhobi
Nov 11 at 18:19
UsingMyBaseClass mediaTypeexpects an instance ofBaseMediaType, whereas I want to pass the class itself.
– Craig Labenz
Nov 11 at 18:24
After a bit of search, it seems it is not possible in Dart: github.com/dart-lang/sdk/issues/34131
– tenhobi
Nov 11 at 18:36
It seems it's that.Typeand subsequent.selffrom Swift that are missing Dart equivalents and would seemingly easily allow for this.
– Craig Labenz
Nov 11 at 19:02
You can use something like github.com/google/built_value.dart/blob/… to pass type information and you can closurize the constructor to pass it around() => MyClass(). It's a bit more boilerplate but otherwise there is hardly anything you can't do.
– Günter Zöchbauer
Nov 11 at 20:54
add a comment |
Instead ofType mediaType;, just useMyBaseClass mediaType;. It should work.
– tenhobi
Nov 11 at 18:19
UsingMyBaseClass mediaTypeexpects an instance ofBaseMediaType, whereas I want to pass the class itself.
– Craig Labenz
Nov 11 at 18:24
After a bit of search, it seems it is not possible in Dart: github.com/dart-lang/sdk/issues/34131
– tenhobi
Nov 11 at 18:36
It seems it's that.Typeand subsequent.selffrom Swift that are missing Dart equivalents and would seemingly easily allow for this.
– Craig Labenz
Nov 11 at 19:02
You can use something like github.com/google/built_value.dart/blob/… to pass type information and you can closurize the constructor to pass it around() => MyClass(). It's a bit more boilerplate but otherwise there is hardly anything you can't do.
– Günter Zöchbauer
Nov 11 at 20:54
Instead of
Type mediaType;, just use MyBaseClass mediaType;. It should work.– tenhobi
Nov 11 at 18:19
Instead of
Type mediaType;, just use MyBaseClass mediaType;. It should work.– tenhobi
Nov 11 at 18:19
Using
MyBaseClass mediaType expects an instance of BaseMediaType, whereas I want to pass the class itself.– Craig Labenz
Nov 11 at 18:24
Using
MyBaseClass mediaType expects an instance of BaseMediaType, whereas I want to pass the class itself.– Craig Labenz
Nov 11 at 18:24
After a bit of search, it seems it is not possible in Dart: github.com/dart-lang/sdk/issues/34131
– tenhobi
Nov 11 at 18:36
After a bit of search, it seems it is not possible in Dart: github.com/dart-lang/sdk/issues/34131
– tenhobi
Nov 11 at 18:36
It seems it's that
.Type and subsequent .self from Swift that are missing Dart equivalents and would seemingly easily allow for this.– Craig Labenz
Nov 11 at 19:02
It seems it's that
.Type and subsequent .self from Swift that are missing Dart equivalents and would seemingly easily allow for this.– Craig Labenz
Nov 11 at 19:02
You can use something like github.com/google/built_value.dart/blob/… to pass type information and you can closurize the constructor to pass it around
() => MyClass(). It's a bit more boilerplate but otherwise there is hardly anything you can't do.– Günter Zöchbauer
Nov 11 at 20:54
You can use something like github.com/google/built_value.dart/blob/… to pass type information and you can closurize the constructor to pass it around
() => MyClass(). It's a bit more boilerplate but otherwise there is hardly anything you can't do.– Günter Zöchbauer
Nov 11 at 20:54
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Instead of
Type mediaType;, just useMyBaseClass mediaType;. It should work.– tenhobi
Nov 11 at 18:19
Using
MyBaseClass mediaTypeexpects an instance ofBaseMediaType, whereas I want to pass the class itself.– Craig Labenz
Nov 11 at 18:24
After a bit of search, it seems it is not possible in Dart: github.com/dart-lang/sdk/issues/34131
– tenhobi
Nov 11 at 18:36
It seems it's that
.Typeand subsequent.selffrom Swift that are missing Dart equivalents and would seemingly easily allow for this.– Craig Labenz
Nov 11 at 19:02
You can use something like github.com/google/built_value.dart/blob/… to pass type information and you can closurize the constructor to pass it around
() => MyClass(). It's a bit more boilerplate but otherwise there is hardly anything you can't do.– Günter Zöchbauer
Nov 11 at 20:54