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No-op ConcurrentStack.PushRange(T[]) if empty #62126

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Merged
merged 4 commits into from
Nov 30, 2021
Merged

No-op ConcurrentStack.PushRange(T[]) if empty #62126

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d8e1bfb
No-op ConcurrentStack.PushRange(T[]) if empty
martincostello Nov 29, 2021
f4e8a88
Add more bounds checks
martincostello Nov 29, 2021
b7729b4
Review feedback
martincostello Nov 29, 2021
069a9eb
Add extra test case
martincostello Nov 29, 2021
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6 changes: 5 additions & 1 deletion ...raries/System.Collections.Concurrent/src/System/Collections/Concurrent/ConcurrentStack.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -316,6 +316,11 @@ public void PushRange(T[] items)
{
throw new ArgumentNullException(nameof(items));
}

// No op if the length is zero
if (items.Length == 0)
return;

PushRange(items, 0, items.Length);
}

Expand Down Expand Up @@ -349,7 +354,6 @@ public void PushRange(T[] items, int startIndex, int count)
if (count == 0)
return;


Node head, tail;
head = tail = new Node(items[startIndex]);
for (int i = startIndex + 1; i < startIndex + count; i++)
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12 changes: 12 additions & 0 deletions src/libraries/System.Collections.Concurrent/tests/ConcurrentStackTests.cs
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Expand Up @@ -63,6 +63,16 @@ public void PushRange_NoItems_NothingAdded()
Assert.True(s.IsEmpty);
}

[Fact]
public void PushRange_NoItems_NothingAdded_NoRangeSpecified()
{
var s = new ConcurrentStack<int>();
Assert.True(s.IsEmpty);

s.PushRange(new int[0]);
Assert.True(s.IsEmpty);
}

[ConditionalTheory(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
[InlineData(8, 10)]
[InlineData(16, 100)]
Expand Down Expand Up @@ -131,6 +141,8 @@ public void PushRange_InvalidArguments_Throws()
var stack = new ConcurrentStack<int>();
Assert.Throws<ArgumentNullException>(() => stack.PushRange(null));
Assert.Throws<ArgumentNullException>(() => stack.PushRange(null, 0, 0));
Assert.Throws<ArgumentOutOfRangeException>(() => stack.PushRange(new int[0], 0, 0));
Assert.Throws<ArgumentOutOfRangeException>(() => stack.PushRange(new int[0], 0, 1));
Assert.Throws<ArgumentOutOfRangeException>(() => stack.PushRange(new int[1], 0, -1));
Assert.Throws<ArgumentOutOfRangeException>(() => stack.PushRange(new int[1], -1, 1));
Assert.Throws<ArgumentOutOfRangeException>(() => stack.PushRange(new int[1], 2, 1));
Expand Down