Re: combine Ada with MS VS C++

[Kilgallen@SpamCop.net (Larry Kilgallen)]

In article <1110978291.469762.247330@g14g2000cwa.googlegroups.com>, ich_bin_elvis@hotmail.com writes:

> Im working on an project where we have an drone traversing a field on
> GPS signals, this project is written in MS VS C++. Our plan is to "pull
> out" the most saefty critical code to ada. We have created an DLL file
> and imported the adadll.lib file in MS VS C++. We have managed to move
> some functions for distance and angle to ada. These functions return
> only one "double" but the problem is that the VS C++ code holds a lot
> of global variables.Some times our functions need to update more than
> one variable. Is there a possibilyty to return more than one variable
> from ada to MS VS C++(This is where the main is).

The typical approach to this with Ada is to create not a function
but a procedure.  A procedure can have multiple output parameters,
one of which could be the new value for the global.

The only real disadvantage this has over a function is that functions
can return arrays of undetermined (prior to the call) size, but that does
not seem to be your situation (and would be hard to receive in C++ anyway.