private AggCastResult bindExplicitConversionFromEnumToDecimal(AggregateType aggTypeDest)
{
Debug.Assert(_typeSrc != null);
Debug.Assert(aggTypeDest != null);
Debug.Assert(aggTypeDest.isPredefType(PredefinedType.PT_DECIMAL));
AggregateType underlyingType = _typeSrc.underlyingType() as AggregateType;
// Need to first cast the source expr to its underlying type.
Expr exprCast;
if (_exprSrc == null)
{
exprCast = null;
}
else
{
ExprClass underlyingExpr = GetExprFactory().CreateClass(underlyingType);
_binder.bindSimpleCast(_exprSrc, underlyingExpr, out exprCast);
}
// There is always an implicit conversion from any integral type to decimal.
if (exprCast.GetConst() != null)
{
// Fold the constant cast if possible.
ConstCastResult result = _binder.bindConstantCast(exprCast, _exprTypeDest, _needsExprDest, out _exprDest, true);
if (result == ConstCastResult.Success)
{
return(AggCastResult.Success); // else, don't fold and use a regular cast, below.
}
if (result == ConstCastResult.CheckFailure && 0 == (_flags & CONVERTTYPE.CHECKOVERFLOW))
{
return(AggCastResult.Abort);
}
}
// Conversions from integral types to decimal are always bound as a user-defined conversion.
if (_needsExprDest)
{
// According the language, this is a standard conversion, but it is implemented
// through a user-defined conversion. Because it's a standard conversion, we don't
// test the CONVERTTYPE.NOUDC flag here.
bool ok = _binder.bindUserDefinedConversion(exprCast, underlyingType, aggTypeDest, _needsExprDest, out _exprDest, false);
Debug.Assert(ok);
}
return(AggCastResult.Success);
}