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Unified Diff: corelib/src/hashable.dart

Issue 10832401: Gentle start with removing explicit interfaces (Closed) Base URL: http://dart.googlecode.com/svn/branches/bleeding_edge/dart/
Patch Set: Created 8 years, 4 months ago
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Index: corelib/src/hashable.dart
===================================================================
--- corelib/src/hashable.dart (revision 11241)
+++ corelib/src/hashable.dart (working copy)
@@ -4,6 +4,10 @@
// Dart core library.
-interface Hashable {
- int hashCode();
+abstract class Hashable {
+ factory Hashable._uninstantiable() {
+ throw const UnsupportedOperationException(
+ "abstract class Hashable cannot be instantiated");
+ }
+ abstract int hashCode();
}
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