oliverbooth/X10D
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X10D
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perf: stackalloc single char span, instead of using ToString, for .NET 7 

This removes the allocations caused by ToString(). Unfortunately, the ReadOnlySpan<char> overload is only available from .NET 7, and so this is a conditional performance gain. Shame.
This commit is contained in:
Oliver Booth 2023-08-27 01:26:37 +01:00
parent cfe70a7923
commit bd823ba818
Signed by: oliverbooth
GPG Key ID: B89D139977693FED
2 changed files with 8 additions and 1 deletions
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1
CHANGELOG.md
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@ -38,6 +38,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
BigEndian/LittleEndian methods. BigEndian/LittleEndian methods.
- X10D: `Stream.GetHash<>` and `Stream.TryWriteHash<>` now throw ArgumentException in lieu of - X10D: `Stream.GetHash<>` and `Stream.TryWriteHash<>` now throw ArgumentException in lieu of
TypeInitializationException. TypeInitializationException.
- X10D: `char.IsEmoji` no longer allocates for .NET 7.
### Removed ### Removed

8
X10D/src/Text/CharExtensions.cs
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@ -18,7 +18,13 @@ public static class CharExtensions
[MethodImpl(CompilerResources.MethodImplOptions)] [MethodImpl(CompilerResources.MethodImplOptions)]
public static bool IsEmoji(this char value) public static bool IsEmoji(this char value)
{ {
return value.ToString().IsEmoji(); #if NET7_0_OR_GREATER
Span<char> chars = stackalloc char[1];
chars[0] = value;
return EmojiRegex.Value.IsMatch(chars);
#else
return EmojiRegex.Value.IsMatch(value.ToString());
#endif
} }
/// <summary> /// <summary>