How

This calamity can be overcome, and a usable, flexible set of research tools can be obtained, if we

• use C++ as the main framework and infrastructure
• create and operate on Fortran90 objects within Fortran90 subroutines/functions
• pass within C++ abstract pointers to Fortran90 objects (data structures and methods).

This is the short recipe for combining both languages. So far it has been successfully tested (in parallel) on an SGI PowerChallenge and on an IBM SP-2 without any change to the source code. We will now present two C++ interfaces, the first for a Fortran90 data structure and the second for a Fortran90 operator.