Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

Create BitArray.HasAllSet() and .HasAnySet(). #81527

Merged
merged 8 commits into from
Feb 13, 2023
Merged

Create BitArray.HasAllSet() and .HasAnySet(). #81527

Show file tree
Hide file tree
Changes from 4 commits
Commits
Show all changes
8 commits
Select commit Hold shift + click to select a range
f0de0e0
Create BitArray.HasAllSet().
lateapexearlyspeed Feb 2, 2023
fa609c2
Fix comment: use span rather than vector directly.
lateapexearlyspeed Feb 3, 2023
aa04830
Create BitArray.HasAnySet().
lateapexearlyspeed Feb 3, 2023
c3460c0
Fix comment: alpha order ref methods.
lateapexearlyspeed Feb 3, 2023
8972678
Create tests.
lateapexearlyspeed Feb 9, 2023
a694d37
Fix comment: rename variable; check by '>= 0'.
lateapexearlyspeed Feb 9, 2023
64a273b
Add xml doc.
lateapexearlyspeed Feb 10, 2023
6694b7e
Fix comment: add cases of other bits besides of the last bit.
lateapexearlyspeed Feb 11, 2023
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Jump to
Jump to file
Failed to load files.
Diff view
Diff view
2 changes: 2 additions & 0 deletions src/libraries/System.Collections/ref/System.Collections.cs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -26,6 +26,8 @@ public sealed partial class BitArray : System.Collections.ICollection, System.Co
public void CopyTo(System.Array array, int index) { }
public bool Get(int index) { throw null; }
public System.Collections.IEnumerator GetEnumerator() { throw null; }
public bool HasAllSet() { throw null; }
public bool HasAnySet() { throw null; }
public System.Collections.BitArray LeftShift(int count) { throw null; }
public System.Collections.BitArray Not() { throw null; }
public System.Collections.BitArray Or(System.Collections.BitArray value) { throw null; }
Expand Down
50 changes: 50 additions & 0 deletions src/libraries/System.Collections/src/System/Collections/BitArray.cs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -910,6 +910,56 @@ public unsafe void CopyTo(Array array, int index)
}
}

public bool HasAllSet()
stephentoub marked this conversation as resolved.
Show resolved Hide resolved
{
Div32Rem(m_length, out int extraBits);
int intCount = GetInt32ArrayLengthFromBitLength(m_length);
if (extraBits != 0)
{
intCount--;
}

const int allSetInt = -1; // 0xFF_FF_FF_FF
if (m_array.AsSpan(0, intCount).IndexOfAnyExcept(allSetInt) != -1)
stephentoub marked this conversation as resolved.
Show resolved Hide resolved
{
return false;
}
stephentoub marked this conversation as resolved.
Show resolved Hide resolved
if (extraBits == 0)
{
return true;
}

Debug.Assert(GetInt32ArrayLengthFromBitLength(m_length) > 0);
Debug.Assert(intCount == GetInt32ArrayLengthFromBitLength(m_length) - 1);

int mask = (1 << extraBits) - 1;
return (m_array[intCount] & mask) == mask;
}

public bool HasAnySet()
{
Div32Rem(m_length, out int extraBits);
int intCount = GetInt32ArrayLengthFromBitLength(m_length);
if (extraBits != 0)
{
intCount--;
}

if (m_array.AsSpan(0, intCount).IndexOfAnyExcept(0) != -1)
stephentoub marked this conversation as resolved.
Show resolved Hide resolved
{
return true;
}
if (extraBits == 0)
{
return false;
}

Debug.Assert(GetInt32ArrayLengthFromBitLength(m_length) > 0);
Debug.Assert(intCount == GetInt32ArrayLengthFromBitLength(m_length) - 1);

return (m_array[intCount] & (1 << extraBits) - 1) != 0;
}

stephentoub marked this conversation as resolved.
Show resolved Hide resolved
public int Count => m_length;

public object SyncRoot => this;
Expand Down