/***************************************************************************************************
* Determine whether this expr has a constant value (EK_CONSTANT or EK_ZEROINIT), possibly with
* side effects (via EK_SEQUENCE or EK_SEQREV). Returns NULL if not, or the constant expr if so.
* The returned Expr will always be an EK_CONSTANT or EK_ZEROINIT.
***************************************************************************************************/
public static Expr GetConst(this Expr expr)
{
Expr exprVal = expr.GetSeqVal();
if (null == exprVal || !exprVal.isCONSTANT_OK() && exprVal.Kind != ExpressionKind.EK_ZEROINIT)
{
return(null);
}
return(exprVal);
}