Creates a flat vol surface. It requires a volatility, plus a calendar and a base date, which are used for calculating the time and hence the variance. The variance is calculated as of the base date. If you need to time evolve the surface, this must be done by cloning and modifying the surface, or with a decorator.
(vol: f64, calendar: RcCalendar, base_date: DateDayFraction)
source not stored for this graph (policy: none)
nothing calls this directly
no test coverage detected