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quiver/lib/src/iterables/infinite_iterable.dart

-// Copyright 2013 Google Inc. All Rights Reserved.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-part of quiver.iterables;
-
-/**
- * A base class for [Iterable]s of infinite length that throws
- * [UnsupportedError] for methods that would require the Iterable to terminate.
- */
-abstract class InfiniteIterable<T> extends IterableBase<T> {
-  bool get isEmpty => false;
-
-  bool get isNotEmpty => true;
-
-  T get last => throw new UnsupportedError('last');
-
-  int get length => throw new UnsupportedError('length');
-
-  T get single => throw new StateError('single');
-
-  bool every(bool f(T element)) => throw new UnsupportedError('every');
-
-  bool fold(initialValue, combine(previousValue, T element)) =>
-      throw new UnsupportedError('fold');
-
-  void forEach(void f(T element)) => throw new UnsupportedError('forEach');
-
-  String join([String separator = '']) => throw new UnsupportedError('join');
-
-  T lastWhere(bool test(T value), {T orElse()}) =>
-      throw new UnsupportedError('lastWhere');
-
-  T reduce(T combine(T value, T element)) =>
-      throw new UnsupportedError('reduce');
-
-  List<T> toList({bool growable: true}) => throw new UnsupportedError('toList');
-
-  Set<T> toSet() => throw new UnsupportedError('toSet');
-}