Sharing application data with chibi without global variables

[Hleb]

Hello!

I have an application written in C++, I want extend with scheme scripts.

Let's imaging that my application is implemented as "class App".

Now I have a context created and want my make my application available in functions added via sexp_define_foreign. I don't want to use global C++ variables for this.

Currently I'm using sexp_env_define to define a new symbol pointing to the application instance and later retrieve it in my functions.

Is there any better way?

[Amirouche Boubekki]

You want to expose c++ methods inside the chino interpreter ?

Is there any better way?

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[Hleb]

Yes, I want to allow user to control the application using scripts.

[Alex Shinn]

That's the low-level approach.  You can also use the FFI and `(define-c-class App)'.

--

Alex

 

Is there any better way?

--

[Hleb]

Why not to add a special field to context or environment to share data between a host application and functions defined for chibi?

Something like this:

==========

sexp sexp_set_env_userdata(sexp env, void *userdata) {
    if (sexp_envp(env)) {
        env->value.env.userdata = userdata;
    }
    return env;
}

void* sexp_get_env_userdata(sexp env) {
    if (sexp_envp(env)) {
        return env->value.env.userdata;
    }
    return NULL;
}

==============