Robert Nystrom
2bf3259005
Change-Id: I582fa00eb713282c3bd6fc1607efc0242ce9076f Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/146686 Commit-Queue: Bob Nystrom <rnystrom@google.com> Auto-Submit: Bob Nystrom <rnystrom@google.com> Reviewed-by: Erik Ernst <eernst@google.com>
43 lines
1.2 KiB
Dart
43 lines
1.2 KiB
Dart
// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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import "package:expect/expect.dart";
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class A<X, Y, Z> {
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shift() => new A<Z, X, Y>();
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swap() => new A<Z, Y, X>();
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first() => new A<X, X, X>();
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last() => new A<Z, Z, Z>();
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wrap() => new A<A<X, X, X>, A<Y, Y, Y>, A<Z, Z, Z>>();
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}
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class B extends A<U, V, W> {}
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class C<T> extends A<U, T, W> {}
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class D<X, Y, Z> extends A<Y, Z, X> {}
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class U {}
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class V {}
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class W {}
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sameType(a, b) => Expect.equals(a.runtimeType, b.runtimeType);
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main() {
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A a = new A<U, V, W>();
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sameType(new A<W, U, V>(), a.shift());
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sameType(new A<W, V, U>(), a.swap());
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sameType(new A<U, U, U>(), a.first());
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sameType(new A<W, W, W>(), a.last());
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sameType(new A<A<U, U, U>, A<V, V, V>, A<W, W, W>>(), a.wrap());
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B b = new B();
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sameType(new A<A<U, U, U>, A<V, V, V>, A<W, W, W>>(), b.wrap());
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C c = new C<V>();
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sameType(new A<A<U, U, U>, A<V, V, V>, A<W, W, W>>(), c.wrap());
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D d = new D<U, V, W>();
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sameType(new A<A<V, V, V>, A<W, W, W>, A<U, U, U>>(), d.wrap());
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}
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