private TypeNaInfo KindReport <T>(IChannel ch, PrimitiveDataViewType type)
{
Contracts.AssertValue(ch);
ch.AssertValue(type);
ch.Assert(type.IsStandardScalar());
var conv = Conversions.Instance;
InPredicate <T> isNaDel;
bool hasNaPred = conv.TryGetIsNAPredicate(type, out isNaDel);
bool defaultIsNa = false;
if (hasNaPred)
{
T def = default(T);
defaultIsNa = isNaDel(in def);
}
return(new TypeNaInfo(hasNaPred, defaultIsNa));
}
protected ValueWriterBase(PrimitiveDataViewType type, int source, char sep)
: base(source)
{
Contracts.Assert(type.IsStandardScalar() || type is KeyType);
Contracts.Assert(type.RawType == typeof(T));
Sep = sep;
if (type is TextDataViewType)
{
// For text we need to deal with escaping.
ValueMapper <ReadOnlyMemory <char>, StringBuilder> c = MapText;
Conv = (ValueMapper <T, StringBuilder>)(Delegate) c;
}
else if (type is TimeSpanDataViewType)
{
ValueMapper <TimeSpan, StringBuilder> c = MapTimeSpan;
Conv = (ValueMapper <T, StringBuilder>)(Delegate) c;
}
else if (type is DateTimeDataViewType)
{
ValueMapper <DateTime, StringBuilder> c = MapDateTime;
Conv = (ValueMapper <T, StringBuilder>)(Delegate) c;
}
else if (type is DateTimeOffsetDataViewType)
{
ValueMapper <DateTimeOffset, StringBuilder> c = MapDateTimeZone;
Conv = (ValueMapper <T, StringBuilder>)(Delegate) c;
}
else
{
Conv = Conversions.Instance.GetStringConversion <T>(type);
}
var d = default(T);
Conv(in d, ref Sb);
Default = Sb.ToString();
}
