Setting a pricing engine to the passed bond from
external code will cause the bootstrap to fail or
to give wrong results. It is advised to discard
the bond after creating the helper, so that the
helper has sole ownership of it.
The latest date at which data are needed by the helper
in order to provide a quote. It does not necessarily
equal the maturity of the underlying instrument.
Bond helper for curve bootstrap
warning This class assumes that the reference date does not change between calls of setTermStructure().