gistfile1.c

// types
typedef struct lipsynth_Module lipsynth_Module;

struct lipsynth_Module {
// blah blah a bunch of values and pointers and stuff
// the only one that I am getting confused about
    int module_registration;
};


// the declaration of the thing (in a header)
extern lipsynth_Module lipsynth_module_sine_proto;

// setting the value of the thing
lipsynth_Module lipsynth_module_sine_proto = {
    .lipsynth_Module_init = lipsynth_module_sine_init,
    .lipsynth_Module_update = lipsynth_module_sine_update,
    .lipsynth_Module_register_parameters = lipsynth_Module_sine_register_parameters
};

// here is where stuff goes wrong
void init_system(){
    // non-functional (seems to copy)
    lipsynth_Module* modulePrototypes [] = {
        lipsynth_module_mixer_proto,
        lipsynth_module_sine_proto,
        lipsynth_module_sampler_proto
    };
    for(int i = 0;i<3;i++){
        lipsynth_core_register_module(ctx, &modulePrototypes[i]);
    }
    // functional, obv these wouldn't both be in the code at the same time
    lipsynth_Module* modulePrototypes [] = {
        &lipsynth_module_mixer_proto,
        &lipsynth_module_sine_proto,
        &lipsynth_module_sampler_proto
    };
    for(int i = 0;i<3;i++){
        lipsynth_core_register_module(ctx, modulePrototypes[i]);
    }
    
    create_instance_of_thing(lipsynth_module_sine_proto);
}
int lipsynth_core_register_module(lipsynth_context *ctx, lipsynth_Module *module_type){
    module_type->module_registration_number = ctx->registered_module_count;
    ctx->registered_module_count++;
    return 1;
}
void create_instance_of_thing(Lipsynth_Module proto){
    proto.module_registration_number <- NOT THE CORRECT VALUE!
}