Question

The pointers function declarations in the following snippets of code allows me to vary the names of each function inside the struct, correct? This is merely hypothetical, so the names are of no consequence yet.

Header File

typedef struct
{
    bool (*enabled)(uint32_void);
    void (*start)(uint32_t);
    void (*stop)(uint32_t);
    bool (*expired)(void);
} battle_star_gallactica;

C File

static bool Battle_v0_enabled (void) { ... }
static void Battle_v0_start (uint32_t) { ... }
static void Battle_v0_stop (uint32_t) { ... }
static bool Battle_v0_stop (void) { ... }

const battle_star_gallactica battle_v0 =
{
    enabled,
    start,
    stop,
    expired
};
...

One Example Use

battle_v0.start(1000);

The C file snippet would be repeated for other versions (e.g. v1 or v2 instead of v0).

How does this work?

EDIT

Corrected code:

Header File

typedef struct
{
    bool (*enabled)(uint32_void);
    void (*start)(uint32_t);
    void (*stop)(uint32_t);
    bool (*expired)(void);
} battle_star_gallactica;

extern const battle_star_gallactica battle_v0;
extern const battle_star_gallactica battle_v1;
...

C File

static bool Battle_v0_enabled (void) { ... }
static void Battle_v0_start (uint32_t val) { ... }
static void Battle_v0_stop (uint32_t val) { ... }
static bool Battle_v0_expired (void) { ... }

const battle_star_gallactica battle_v0 =
{
    Battle_v0_enabled,
    Battle_v0_start,
    Battle_v0_stop,
    Battle_v0_expired
};
...

One Example Use

battle_v0.start(1000);

Answer 1

Yes. But you have a few issues:

1) Battle_v0_stop is defined twice
2) When initing battle_v0 you need to prefix values with Battle_v0_

You could then do:

battle_v0.enabled()

But I would have currnet battle star galactic and use it:

const battle_star_gallactica bsg = battle_v0;
bgs.enabled()