John Messerly
29 lines
695 B
Dart
29 lines
695 B
Dart
// Copyright (c) 2013, 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 B<T> {
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}
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class A<T> {
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var field;
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A(this.field);
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asTypeVariable() => field as T;
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asBOfT() => field as B<T>;
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}
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main() {
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Expect.equals(42, new A<int>(42).asTypeVariable());
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Expect.throws(
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() => new A<String>(42).asTypeVariable(),
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(e) => e is CastError);
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var b = new B<int>();
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Expect.equals(b, new A<int>(b).asBOfT());
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Expect.throws(
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() => new A<String>(b).asBOfT(),
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(e) => e is CastError);
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}
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