Kallen Tu
e3ca5ee6ba
Tests have both correct and erroneous implementations of variance. Change-Id: I49dd76f42399015dd6e3f9688e598c271ce7ab1c Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/119722 Commit-Queue: Kallen Tu <kallentu@google.com> Reviewed-by: Leaf Petersen <leafp@google.com> Reviewed-by: Dmitry Stefantsov <dmitryas@google.com>
59 lines
1.7 KiB
Dart
59 lines
1.7 KiB
Dart
// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file
|
|
// for details. All rights reserved. Use of this source code is governed by a
|
|
// BSD-style license that can be found in the LICENSE file.
|
|
|
|
// Tests subclass usage for the `out` variance modifier.
|
|
|
|
// SharedOptions=--enable-experiment=variance
|
|
|
|
typedef CovFunction<T> = T Function();
|
|
typedef ContraFunction<T> = void Function(T);
|
|
|
|
class LegacyCovariant<T> {}
|
|
class Covariant<out T> {}
|
|
class Contravariant<in T> {}
|
|
mixin MLegacyCovariant<T> {}
|
|
mixin MCovariant<out T> {}
|
|
|
|
class A<out T> extends LegacyCovariant<T> {}
|
|
class B<out T> implements LegacyCovariant<T> {}
|
|
class C<out T> with MLegacyCovariant<T> {}
|
|
|
|
class D<out T> extends Covariant<T> {}
|
|
class E<out T> implements Covariant<T> {}
|
|
class F<out T> with MCovariant<T> {}
|
|
|
|
class G<out T> extends Covariant<Covariant<T>> {}
|
|
class H<out T> extends Contravariant<Contravariant<T>> {}
|
|
|
|
class I<out T> extends Covariant<CovFunction<T>> {}
|
|
class J<out T> extends Covariant<ContraFunction<ContraFunction<T>>> {}
|
|
class K<out T> extends Contravariant<CovFunction<Contravariant<T>>> {}
|
|
|
|
class L<out T> extends Covariant<CovFunction<Covariant<T>>> {}
|
|
|
|
class M<out T> extends Covariant<Covariant<Covariant<T>>> {}
|
|
|
|
class N<out T> = Covariant<T> with MCovariant<T>;
|
|
class O<out T> = Contravariant<Contravariant<T>> with MCovariant<T>;
|
|
class P<out T> = Covariant<T> with MCovariant<Covariant<T>>;
|
|
|
|
main() {
|
|
A<num> a = A();
|
|
B<num> b = B();
|
|
C<num> c = C();
|
|
D<num> d = D();
|
|
E<num> e = E();
|
|
F<num> f = F();
|
|
G<num> g = G();
|
|
H<num> h = H();
|
|
I<num> i = I();
|
|
J<num> j = J();
|
|
K<num> k = K();
|
|
L<num> l = L();
|
|
M<num> m = M();
|
|
N<num> n = N();
|
|
O<num> o = O();
|
|
P<num> p = P();
|
|
}
|