public static extern void git_revwalk_reset(RevWalkerSafeHandle walker);
public static extern void git_revwalk_sorting(RevWalkerSafeHandle walk, GitSortOptions sort);
public static extern int git_revwalk_next(out GitOid oid, RevWalkerSafeHandle walker);
public static extern int git_revwalk_push(RevWalkerSafeHandle walker, ref GitOid oid);
internal static extern int git_revwalk_push(RevWalkerSafeHandle walker, ref GitOid id);
public static extern int git_revwalk_new(out RevWalkerSafeHandle walker, RepositorySafeHandle repo);
internal static extern int git_revwalk_hide(RevWalkerSafeHandle walker, ref GitOid commit_id);
internal static extern int git_revwalk_next(out GitOid id, RevWalkerSafeHandle walker);