public static bool Contains(this ICharSequence sequence, char c)
{
switch (sequence)
{
case null:
return(false);
case IHasAsciiSpan hasAscii:
if ((uint)c > AsciiString.uMaxCharValue)
{
return(false);
}
var asciiSpan = hasAscii.AsciiSpan;
return(SpanHelpers.Contains(ref MemoryMarshal.GetReference(asciiSpan), (byte)c, asciiSpan.Length));
case IHasUtf16Span hasUtf16:
var utf16Span = hasUtf16.Utf16Span;
return(SpanHelpers.Contains(ref MemoryMarshal.GetReference(utf16Span), c, utf16Span.Length));
default:
int length = sequence.Count;
for (int i = 0; i < length; i++)
{
if (sequence[i] == c)
{
return(true);
}
}
return(false);
}
}
