Manipulating array descriptors from C?

[ivanpribec]

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Issues interfacing between C++ and Fortran

Hi @ivanpribec, I had a look at the code from your original post using the C descriptor and I think I’ve got it working. I think you are right that the C descriptor does not survive the initial call. From the interpretation document 18-007r1, section 18.8 Restrictions on lifetimes, paragraph 2: A C descriptor whose address is a formal parameter that corresponds to a Fortran dummy argument becomes undefined on return from a call to the function from Fortran. If the dummy argument does not have…

You can store a copy of the base_addr in your struct, but you’re still at risk of your C struct becoming invalid due to a deallocate statement or the end of a scope, or the creation of an array temporary. Essentially you can’t have two sources of truth as one is bound to become corrupt at some point.