ager@google.com
02b566ee62
R=lrn@google.com BUG= Review URL: https://codereview.chromium.org//10974004 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@12770 260f80e4-7a28-3924-810f-c04153c831b5
75 lines
2.2 KiB
Dart
75 lines
2.2 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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/**
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* Everything in Dart is an [Object].
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*/
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class Object {
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/**
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* Creates a new [Object] instance.
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*
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* [Object] instances have no meaningful state, and are only useful
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* through their identity. An [Object] instance is equal to itself
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* only.
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*/
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const Object();
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/**
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* The equality operator.
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*
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* The default behavior for all [Object]s is to return true if and
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* only if [:this:] and [other] are the same object.
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*
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* If a subclass overrides the equality operator it should override
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* the [hashCode] method as well to maintain consistency.
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*/
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bool operator ==(other) => identical(this, other);
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/**
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* Get a hash code for this object.
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*
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* All objects have hash codes. Hash codes are guaranteed to be the
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* same for objects that are equal when compared using the equality
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* operator [:==:]. Other than that there are no guarantees about
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* the hash codes. They will not be consistent between runs and
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* there are no distribution guarantees.
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*
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* If a subclass overrides [hashCode] it should override the
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* equality operator as well to maintain consistency.
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*/
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external int hashCode();
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/**
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* Returns a string representation of this object.
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*/
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external String toString();
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/**
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* [noSuchMethod] is invoked when users invoke a non-existant method
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* on an object. The name of the method and the arguments of the
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* invocation are passed to [noSuchMethod]. If [noSuchMethod]
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* returns a value, that value becomes the result of the original
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* invocation.
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*
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* The default behavior of [noSuchMethod] is to throw a
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* [noSuchMethodError].
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*/
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external Dynamic noSuchMethod(String name, List args);
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/**
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* Returns a representation of the runtime type of the object.
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*/
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external Type runtimeType();
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}
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/**
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* Representation of a type.
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*/
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abstract class Type {}
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/**
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* Check whether two references are to the same object.
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*/
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bool identical(Object a, Object b) => a === b;
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