private static Type GetWidestType(Type Type1, Type Type2)
{
if ((Type1 != null) && (Type2 != null))
{
if (!Type1.IsEnum && !Type2.IsEnum)
{
TypeCode typeCode = Symbols.GetTypeCode(Type1);
TypeCode code2 = Symbols.GetTypeCode(Type2);
if (Symbols.IsNumericType(typeCode) && Symbols.IsNumericType(code2))
{
return(Symbols.MapTypeCodeToType(ConversionResolution.ForLoopWidestTypeCode[(int)typeCode][(int)code2]));
}
}
Symbols.Method operatorMethod = null;
switch (ConversionResolution.ClassifyConversion(Type2, Type1, ref operatorMethod))
{
case ConversionResolution.ConversionClass.Identity:
case ConversionResolution.ConversionClass.Widening:
return(Type2);
}
operatorMethod = null;
if (ConversionResolution.ClassifyConversion(Type1, Type2, ref operatorMethod) == ConversionResolution.ConversionClass.Widening)
{
return(Type1);
}
}
return(null);
}
internal bool Lookup(Type TargetType, Type SourceType, ref ConversionResolution.ConversionClass Classification, ref Symbols.Method OperatorMethod)
{
int first = this.m_First;
for (int i = 0; i < this.m_Count; i++)
{
if ((TargetType == this.m_List[first].TargetType) && (SourceType == this.m_List[first].SourceType))
{
Classification = this.m_List[first].Classification;
OperatorMethod = this.m_List[first].OperatorMethod;
this.MoveToFront(first);
return true;
}
first = this.m_List[first].Next;
}
Classification = ConversionResolution.ConversionClass.Bad;
OperatorMethod = null;
return false;
}
internal void Insert(Type TargetType, Type SourceType, ConversionResolution.ConversionClass Classification, Symbols.Method OperatorMethod)
{
if (this.m_Count < this.m_Size)
{
this.m_Count++;
}
int last = this.m_Last;
this.m_First = last;
this.m_Last = this.m_List[this.m_Last].Previous;
this.m_List[last].TargetType = TargetType;
this.m_List[last].SourceType = SourceType;
this.m_List[last].Classification = Classification;
this.m_List[last].OperatorMethod = OperatorMethod;
}