// Returns the fingerprint chain + captured constants list for this expression, or null
// if the expression couldn't be fingerprinted.
public static ExpressionFingerprintChain GetFingerprintChain(Expression expr, out List <object> capturedConstants)
{
FingerprintingExpressionVisitor visitor = new FingerprintingExpressionVisitor();
visitor.Visit(expr);
if (visitor._gaveUp)
{
capturedConstants = null;
return(null);
}
else
{
capturedConstants = visitor._seenConstants;
return(visitor._currentChain);
}
}
