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annotation_on_pointer_field

Fields in a struct class whose type is 'Pointer' shouldn't have any annotations.

Description

#

The analyzer produces this diagnostic when a field that's declared in a subclass of Struct and has the type Pointer also has an annotation associated with it.

For more information about FFI, see C interop using dart:ffi.

Example

#

The following code produces this diagnostic because the field p, which has the type Pointer and is declared in a subclass of Struct, has the annotation @Double():

dart
import 'dart:ffi';

final class C extends Struct {
  @Double()
  external Pointer<Int8> p;
}

Common fixes

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Remove the annotations from the field:

dart
import 'dart:ffi';

final class C extends Struct {
  external Pointer<Int8> p;
}