spect_stream::is_derivable

Source: stream/spect/spect_stream__is_derivable.pro

 spect_stream::is_derivable
        Return whether a spect stream is in a sufficiently processed
        state to generate the data of a derived stream.

 Usage:
        ok = strref -> is_derivable()

 Arguments: none

 History:
        Original (after rate): 1/5/02; SJT