the calendar used for reference and/or option date calculation
date-range check
time-range check
the day counter used for date/time conversion
the latest date for which the curve can return values
the latest time for which the curve can return values
the date at which discount = 1.0 and/or variance = 0.0
the settlementDays used for reference date calculation
date/time conversion
Volatility term structure
This abstract class defines the interface of concrete volatility structures which will be derived from this one.