/// <summary>
/// Calculates a HashCode for a character span
/// </summary>
/// <param name="span">The span to calculate</param>
/// <param name="comparisonType">The string comparison to use for the hash calculation</param>
/// <returns>The matching hash code</returns>
public static int GetHashCode(this ReadOnlySpan <char> span, StringComparison comparisonType)
{
// TODO: Implement a proper GetHashCode for .Net Standard
#if NETSTANDARD2_1
return(span.AsString().GetHashCode(comparisonType));
#elif NETSTANDARD2_0
return((comparisonType switch
{
StringComparison.Ordinal => StringComparer.Ordinal,
StringComparison.OrdinalIgnoreCase => StringComparer.OrdinalIgnoreCase,
StringComparison.InvariantCulture => StringComparer.InvariantCulture,
StringComparison.InvariantCultureIgnoreCase => StringComparer.InvariantCultureIgnoreCase,
StringComparison.CurrentCulture => StringComparer.CurrentCulture,
StringComparison.CurrentCultureIgnoreCase => StringComparer.CurrentCultureIgnoreCase,
_ => throw new ArgumentOutOfRangeException(nameof(comparisonType))
}).GetHashCode(span.AsString()));
