[dart-misc] Accessing static members of a type casted to dynamic

[Ryan Gonzalez]

TL;DR: try running this in DartPad:

class X {
static String x = 'this is X.x';
}

void main() {
print(X.x);
print((X as dynamic).x);
}

It will give:

this is X.x
Uncaught exception:
C.Type_X_P98.get$x is not a function

Is this a bug or known issue? Is there any way to work around it for the
time being?

In my scenario, I'm passing a type like the above to a function, and I need
to access a static property on it (the reasons are a bit complicated, but
it basically has to do with adding a static property in a builder). Right
now, I'm trying something like this:

void func(dynamic type) {
print(type.x);
}

func(X);

but it's not working, of course...
--
Ryan (ラむアン)
Yoko Shimomura, ryo (supercell/EGOIST), Hiroyuki Sawano >> everyone else
https://refi64.com/

[Matan Lurey]

Post by Ryan Gonzalez
class X {
static String x = 'this is X.x';
}
void main() {
print(X.x);
print((X as dynamic).x);
}
this is X.x
C.Type_X_P98.get$x is not a function
Is this a bug or known issue? Is there any way to work around it for the
time being?

No, the Dart language does not have dynamic access to static members
(static members are not part of the interface of a class - they are
basically just sugar instead of using top-level methods or fields).

Post by Ryan Gonzalez
In my scenario, I'm passing a type like the above to a function, and I
need to access a static property on it (the reasons are a bit complicated,
but it basically has to do with adding a static property in a builder).
void func(dynamic type) {
print(type.x);
}
func(X);
but it's not working, of course...

You'll need to restructure how you are writing your types. A popular way is
having two types:

class Builder<T> {
T build();
}

class X {
String x = 'This is X';
}

class XBuilder implements Builder<X> {
@override
T build() => new X();
}

Post by Ryan Gonzalez
--
Ryan (ラむアン)
Yoko Shimomura, ryo (supercell/EGOIST), Hiroyuki Sawano >> everyone else
https://refi64.com/
--
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