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Diffstat (limited to 'Rx/NET/Source/System.Reactive.Linq/Reactive/Internal/HashSet.cs')
| -rw-r--r-- | Rx/NET/Source/System.Reactive.Linq/Reactive/Internal/HashSet.cs | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/Rx/NET/Source/System.Reactive.Linq/Reactive/Internal/HashSet.cs b/Rx/NET/Source/System.Reactive.Linq/Reactive/Internal/HashSet.cs new file mode 100644 index 0000000..f1fce24 --- /dev/null +++ b/Rx/NET/Source/System.Reactive.Linq/Reactive/Internal/HashSet.cs @@ -0,0 +1,45 @@ +// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information. + +#if NO_HASHSET +using System; +using System.Collections.Generic; + +namespace System.Reactive +{ + class HashSet<T> + { + private readonly Dictionary<T, object> _set; + private bool _hasNull; + + public HashSet(IEqualityComparer<T> comparer) + { + _set = new Dictionary<T, object>(comparer); + _hasNull = false; + } + + public bool Add(T value) + { + // + // Note: The box instruction in the IL will be erased by the JIT in case T is + // a value type. See GroupBy for more information. + // + if (value == null) + { + if (_hasNull) + return false; + + _hasNull = true; + return true; + } + else + { + if (_set.ContainsKey(value)) + return false; + + _set[value] = null; + return true; + } + } + } +} +#endif
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