private static bool TryGetCommonPrimitiveType(
TypeUsage type1,
TypeUsage type2,
out TypeUsage commonType)
{
commonType = (TypeUsage)null;
if (TypeSemantics.IsPromotableTo(type1, type2))
{
commonType = TypeSemantics.ForgetConstraints(type2);
return(true);
}
if (TypeSemantics.IsPromotableTo(type2, type1))
{
commonType = TypeSemantics.ForgetConstraints(type1);
return(true);
}
ReadOnlyCollection <PrimitiveType> commonSuperTypes = TypeSemantics.GetPrimitiveCommonSuperTypes((PrimitiveType)type1.EdmType, (PrimitiveType)type2.EdmType);
if (commonSuperTypes.Count == 0)
{
return(false);
}
commonType = TypeUsage.CreateDefaultTypeUsage((EdmType)commonSuperTypes[0]);
return(null != commonType);
}
internal static bool TryGetCommonType(
TypeUsage type1,
TypeUsage type2,
out TypeUsage commonType)
{
commonType = (TypeUsage)null;
if (type1.EdmEquals((MetadataItem)type2))
{
commonType = TypeSemantics.ForgetConstraints(type2);
return(true);
}
if (Helper.IsPrimitiveType(type1.EdmType) && Helper.IsPrimitiveType(type2.EdmType))
{
return(TypeSemantics.TryGetCommonPrimitiveType(type1, type2, out commonType));
}
EdmType commonEdmType;
if (TypeSemantics.TryGetCommonType(type1.EdmType, type2.EdmType, out commonEdmType))
{
commonType = TypeSemantics.ForgetConstraints(TypeUsage.Create(commonEdmType));
return(true);
}
commonType = (TypeUsage)null;
return(false);
}