/// <summary>
/// Sammelt die Namen der in <paramref name="telType"/> gesetzten Flags in
/// <paramref name="list"/>. <paramref name="list"/> wird von der Methode nicht
/// geleert.
/// </summary>
/// <param name="telType"><see cref="TelTypes"/>-Objekt oder <c>null</c>.</param>
/// <param name="list">Eine Liste zum sammeln.</param>
internal static void CollectValueStrings(TelTypes?telType, List <string> list)
{
Debug.Assert(list != null);
if (!telType.HasValue)
{
return;
}
TelTypes value = telType.Value & TelTypesConverter.DEFINED_TEL_TYPES_VALUES;
for (int i = TelTypesConverter.TelTypesMinBit; i <= TelTypesConverter.TelTypesMaxBit; i++)
{
TelTypes flag = (TelTypes)(1 << i);
if (value.HasFlag(flag))
{
list.Add(flag.ToVcfString());
}
}
}
public static bool IsSet(this TelTypes?value, TelTypes flags) => (value & flags) == flags;
public static TelTypes?Unset(this TelTypes?value, TelTypes flags)
{
value &= ~flags;
return(value == (TelTypes)0 ? null : value);
}
public static TelTypes?Set(this TelTypes?value, TelTypes flags) => value.HasValue ? (value.Value | flags) : flags;