Re: [Quantlib-dev] TermStructures (Oleg Burundukov)

[Chris K. <chr...@ya...>]

Hi Oleg, & list,

both of the first two layers are really interfaces:
- the first says what you get
- the second (interpolated) says that if you already know the answer here is what you get, as you say a data representation.
- the third layer says how to build something on the second
I.e. the third layer is a specific way to construct an interpolated whatever.  I would argue (am arguing ;-)) against combining levels two and three because combining them would force the second layer (interpolated) to be made in a certain way from a certain set of input data.  As a design point I think that it's better to leave the construction of the data separate from the data itself.   

Best regards,
Chris