gistfile1.txt

#include <stdio.h>
#include <flecs.h>

typedef struct Position {
    float x;
    float y;
} Position;

int main(int argc, char *argv[]) {
    ecs_world_t *ecs = ecs_init_w_args(argc, argv);

    ECS_COMPONENT_DEFINE(ecs, Position);

    ecs_singleton_add(ecs, Position);
    ecs_singleton_set(ecs, Position, {1, 1});

    ecs_snapshot_t* snap = ecs_snapshot_take(ecs);
    
    Position* p = ecs_singleton_get_mut(ecs, Position);
    p->x = 2;
    p->y = 2;

    ecs_snapshot_restore(ecs, snap);
    Position* p2 = ecs_singleton_get(ecs, Position);
    printf("x: %f, y: %f\n", p2->x, p2->y);

    return ecs_fini(ecs);
}