mutation_tracker.h

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#pragma once
#include <derive-c/core/prelude.h>
#include <stddef.h>
 
#if defined NDEBUG
 
ZERO_SIZED(mutation_tracker);
ZERO_SIZED(mutation_version);
 
static mutation_tracker mutation_tracker_new() { return (mutation_tracker){}; }
 
static void mutation_tracker_mutate(mutation_tracker* self) { (void)self; }
 
static mutation_version mutation_tracker_get(mutation_tracker const* self) {
    (void)self;
    return (mutation_version){};
}
 
static void mutation_version_check(mutation_version const* self) { (void)self; }
 
#else
 
typedef struct {
    size_t count;
} mutation_tracker;
 
typedef struct {
    mutation_tracker const* tracker;
    size_t const count;
} mutation_version;
 
static mutation_tracker mutation_tracker_new() { return (mutation_tracker){.count = 0}; }
 
static void mutation_tracker_mutate(mutation_tracker* self) {
    ASSERT(self);
    self->count++;
}
 
static mutation_version mutation_tracker_get(mutation_tracker const* self) {
    ASSERT(self);
    return (mutation_version){.tracker = self, .count = self->count};
}

static void mutation_version_check(mutation_version const* self) {
    ASSERT(self->count == self->tracker->count, "No mutations to the tracker's data structure were "
                                                "expected... however it has been mutated");
}
#endif