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1 // Copyright 2013 Google Inc. All Rights Reserved. | |
2 // | |
3 // Licensed under the Apache License, Version 2.0 (the "License"); | |
4 // you may not use this file except in compliance with the License. | |
5 // You may obtain a copy of the License at | |
6 // | |
7 // http://www.apache.org/licenses/LICENSE-2.0 | |
8 // | |
9 // Unless required by applicable law or agreed to in writing, software | |
10 // distributed under the License is distributed on an "AS IS" BASIS, | |
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
12 // See the License for the specific language governing permissions and | |
13 // limitations under the License. | |
14 | |
15 part of quiver.iterables; | |
16 | |
17 /// A base class for [Iterable]s of infinite length that throws | |
18 /// [UnsupportedError] for methods that would require the Iterable to terminate. | |
19 abstract class InfiniteIterable<T> extends IterableBase<T> { | |
20 bool get isEmpty => false; | |
21 | |
22 bool get isNotEmpty => true; | |
23 | |
24 T get last => throw new UnsupportedError('last'); | |
25 | |
26 int get length => throw new UnsupportedError('length'); | |
27 | |
28 T get single => throw new StateError('single'); | |
29 | |
30 bool every(bool f(T element)) => throw new UnsupportedError('every'); | |
31 | |
32 bool fold(initialValue, combine(previousValue, T element)) => | |
33 throw new UnsupportedError('fold'); | |
34 | |
35 void forEach(void f(T element)) => throw new UnsupportedError('forEach'); | |
36 | |
37 String join([String separator = '']) => throw new UnsupportedError('join'); | |
38 | |
39 T lastWhere(bool test(T value), {T orElse()}) => | |
40 throw new UnsupportedError('lastWhere'); | |
41 | |
42 T reduce(T combine(T value, T element)) => | |
43 throw new UnsupportedError('reduce'); | |
44 | |
45 List<T> toList({bool growable: true}) => throw new UnsupportedError('toList'); | |
46 | |
47 Set<T> toSet() => throw new UnsupportedError('toSet'); | |
48 } | |
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