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Use C# 8.0 switch expression #1037

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merged 2 commits into from Sep 23, 2019
Merged

Use C# 8.0 switch expression #1037

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ecd22ed
Use C# 8.0 switch expression
bartdesmet Sep 23, 2019
36d59e3
Merge branch 'master' into dev/bartde/switch_expr
bartdesmet Sep 23, 2019
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13 changes: 5 additions & 8 deletions Ix.NET/Source/System.Linq.Async/System/Linq/Operators/Concat.cs
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Expand Up @@ -46,15 +46,12 @@ internal override ConcatAsyncIterator<TSource> Concat(IAsyncEnumerable<TSource>

internal override IAsyncEnumerable<TSource>? GetAsyncEnumerable(int index)
{
switch (index)
return index switch
{
case 0:
return _first;
case 1:
return _second;
default:
return null;
}
0 => _first,
1 => _second,
_ => null,
};
}
}

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16 changes: 6 additions & 10 deletions Ix.NET/Source/System.Linq.Async/System/Linq/Operators/Count.cs
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Expand Up @@ -16,17 +16,13 @@ public static ValueTask<int> CountAsync<TSource>(this IAsyncEnumerable<TSource>
if (source == null)
throw Error.ArgumentNull(nameof(source));

switch (source)
return source switch
{
case ICollection<TSource> collection:
return new ValueTask<int>(collection.Count);
case IAsyncIListProvider<TSource> listProv:
return listProv.GetCountAsync(onlyIfCheap: false, cancellationToken);
case ICollection collection:
return new ValueTask<int>(collection.Count);
}

return Core(source, cancellationToken);
ICollection<TSource> collection => new ValueTask<int>(collection.Count),
IAsyncIListProvider<TSource> listProv => listProv.GetCountAsync(onlyIfCheap: false, cancellationToken),
ICollection collection => new ValueTask<int>(collection.Count),
_ => Core(source, cancellationToken),
};

static async ValueTask<int> Core(IAsyncEnumerable<TSource> source, CancellationToken cancellationToken)
{
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39 changes: 15 additions & 24 deletions Ix.NET/Source/System.Linq.Async/System/Linq/Operators/Select.cs
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Expand Up @@ -17,15 +17,12 @@ public static partial class AsyncEnumerable
if (selector == null)
throw Error.ArgumentNull(nameof(selector));

switch (source)
return source switch
{
case AsyncIterator<TSource> iterator:
return iterator.Select(selector);
case IList<TSource> list:
return new SelectIListIterator<TSource, TResult>(list, selector);
}

return new SelectEnumerableAsyncIterator<TSource, TResult>(source, selector);
AsyncIterator<TSource> iterator => iterator.Select(selector),
IList<TSource> list => new SelectIListIterator<TSource, TResult>(list, selector),
_ => new SelectEnumerableAsyncIterator<TSource, TResult>(source, selector),
};
}

public static IAsyncEnumerable<TResult> Select<TSource, TResult>(this IAsyncEnumerable<TSource> source, Func<TSource, int, TResult> selector)
Expand Down Expand Up @@ -60,15 +57,12 @@ await foreach (var element in source.WithCancellation(cancellationToken).Configu
if (selector == null)
throw Error.ArgumentNull(nameof(selector));

switch (source)
return source switch
{
case AsyncIterator<TSource> iterator:
return iterator.Select(selector);
case IList<TSource> list:
return new SelectIListIteratorWithTask<TSource, TResult>(list, selector);
}

return new SelectEnumerableAsyncIteratorWithTask<TSource, TResult>(source, selector);
AsyncIterator<TSource> iterator => iterator.Select(selector),
IList<TSource> list => new SelectIListIteratorWithTask<TSource, TResult>(list, selector),
_ => new SelectEnumerableAsyncIteratorWithTask<TSource, TResult>(source, selector),
};
}

#if !NO_DEEP_CANCELLATION
Expand All @@ -79,15 +73,12 @@ await foreach (var element in source.WithCancellation(cancellationToken).Configu
if (selector == null)
throw Error.ArgumentNull(nameof(selector));

switch (source)
return source switch
{
case AsyncIterator<TSource> iterator:
return iterator.Select(selector);
case IList<TSource> list:
return new SelectIListIteratorWithTaskAndCancellation<TSource, TResult>(list, selector);
}

return new SelectEnumerableAsyncIteratorWithTaskAndCancellation<TSource, TResult>(source, selector);
AsyncIterator<TSource> iterator => iterator.Select(selector),
IList<TSource> list => new SelectIListIteratorWithTaskAndCancellation<TSource, TResult>(list, selector),
_ => new SelectEnumerableAsyncIteratorWithTaskAndCancellation<TSource, TResult>(source, selector),
};
}
#endif

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11 changes: 5 additions & 6 deletions Ix.NET/Source/System.Linq.Async/System/Linq/Operators/Single.cs
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Expand Up @@ -21,13 +21,12 @@ static async ValueTask<TSource> Core(IAsyncEnumerable<TSource> source, Cancellat
{
if (source is IList<TSource> list)
{
switch (list.Count)
return list.Count switch
{
case 0: throw Error.NoElements();
case 1: return list[0];
}

throw Error.MoreThanOneElement();
0 => throw Error.NoElements(),
1 => list[0],
_ => throw Error.MoreThanOneElement(),
};
}

await using var e = source.GetConfiguredAsyncEnumerator(cancellationToken, false);
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11 changes: 5 additions & 6 deletions Ix.NET/Source/System.Linq.Async/System/Linq/Operators/SingleOrDefault.cs
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Expand Up @@ -21,13 +21,12 @@ static async ValueTask<TSource> Core(IAsyncEnumerable<TSource> source, Cancellat
{
if (source is IList<TSource> list)
{
switch (list.Count)
return list.Count switch
{
case 0: return default!;
case 1: return list[0];
}

throw Error.MoreThanOneElement();
0 => default!,
1 => list[0],
_ => throw Error.MoreThanOneElement(),
};
}

await using (var e = source.GetConfiguredAsyncEnumerator(cancellationToken, false))
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13 changes: 5 additions & 8 deletions Ix.NET/Source/System.Linq.Async/System/Linq/Operators/ToAsyncEnumerable.cs
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Expand Up @@ -16,15 +16,12 @@ public static IAsyncEnumerable<TSource> ToAsyncEnumerable<TSource>(this IEnumera
if (source == null)
throw Error.ArgumentNull(nameof(source));

switch (source)
return source switch
{
case IList<TSource> list:
return new AsyncIListEnumerableAdapter<TSource>(list);
case ICollection<TSource> collection:
return new AsyncICollectionEnumerableAdapter<TSource>(collection);
}

return new AsyncEnumerableAdapter<TSource>(source);
IList<TSource> list => new AsyncIListEnumerableAdapter<TSource>(list),
ICollection<TSource> collection => new AsyncICollectionEnumerableAdapter<TSource>(collection),
_ => new AsyncEnumerableAdapter<TSource>(source),
};
}

private sealed class AsyncEnumerableAdapter<T> : AsyncIterator<T>, IAsyncIListProvider<T>
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14 changes: 6 additions & 8 deletions Ix.NET/Source/System.Linq.Async/System/Linq/Operators/Union.cs
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Expand Up @@ -219,15 +219,13 @@ public UnionAsyncIterator2(IAsyncEnumerable<TSource> first, IAsyncEnumerable<TSo
internal override IAsyncEnumerable<TSource>? GetEnumerable(int index)
{
Debug.Assert(index >= 0 && index <= 2);
switch (index)

return index switch
{
case 0:
return _first;
case 1:
return _second;
default:
return null;
}
0 => _first,
1 => _second,
_ => null,
};
}

internal override UnionAsyncIterator<TSource> Union(IAsyncEnumerable<TSource> next)
Expand Down