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Use structs as local namespaces in C code

struct Engine_Data {
struct State* currentState;
int someFlags;
};

static struct Engine_Data s;

Putting all static vars in a compilation unit into a single struct has advantages:

Watching in a debugger is easy since there's a single state variable containing all state
Transition from static to reusable objects is much easier since instance data is already encapsulated

struct Engine_vtable {
int (*start)();
int (*stop)();
};

/* Reusable class */
struct Engine {
struct Engine_vtable* vtable;
struct Engine_Data s;
};

/* Initializer */
void Engine_Init(struct Engine* e);

int main()
{
struct Engine engine;

Engine_Init(&engine);
}

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