Robert Nystrom
48608ce9bc
Change-Id: I8e21f82dc241a63f78fb1f6a25669b1aa633788c Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/152080 Commit-Queue: Bob Nystrom <rnystrom@google.com> Auto-Submit: Bob Nystrom <rnystrom@google.com> Reviewed-by: Leaf Petersen <leafp@google.com>
43 lines
1.5 KiB
Dart
43 lines
1.5 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 variance usage multiple type parameters.
|
|
|
|
// SharedOptions=--enable-experiment=variance
|
|
|
|
typedef CovFunction<T> = T Function();
|
|
typedef ContraFunction<T> = void Function(T);
|
|
|
|
class Covariant<out T> {}
|
|
class Contravariant<in T> {}
|
|
|
|
class A<in T, out U> {}
|
|
class B<in T, out U, inout V> {}
|
|
|
|
class C<inout T, in U, out V> extends A<T, V> {}
|
|
class D<inout T, in U, out V> extends B<U, V, T> {}
|
|
class E<inout T, in U, out V> extends B<T, T, T> {}
|
|
|
|
class F<inout T, in U, out V> extends A<Contravariant<V>, Contravariant<U>> {}
|
|
class G<inout T, in U, out V> extends A<Covariant<Contravariant<V>>, Contravariant<Covariant<U>>> {}
|
|
class H<inout T, in U, out V> extends B<Covariant<U>, Covariant<V>, Covariant<T>> {}
|
|
|
|
class I<inout T, in U, out V> extends A<ContraFunction<V>, ContraFunction<U>> {}
|
|
class J<inout T, in U, out V> extends A<CovFunction<ContraFunction<V>>, ContraFunction<CovFunction<U>>> {}
|
|
class K<inout T, in U, out V> extends B<CovFunction<U>, CovFunction<V>, CovFunction<T>> {}
|
|
|
|
main() {
|
|
A<num, bool> a = A();
|
|
B<num, bool, String> b = B();
|
|
C<num, bool, String> c = C();
|
|
D<num, bool, String> d = D();
|
|
E<num, bool, String> e = E();
|
|
F<num, bool, String> f = F();
|
|
G<num, bool, String> g = G();
|
|
H<num, bool, String> h = H();
|
|
I<num, bool, String> i = I();
|
|
J<num, bool, String> j = J();
|
|
K<num, bool, String> k = K();
|
|
}
|