Introduce the concept of a `game_aux_info' structure. This is

constructed at the same time as an internally generated game seed,
so that it can preserve any interesting information known by the
program at generation time but not physically contained within the
text of the game seed itself. (Such as, for example, the solution.)
Currently not used for anything yet, but it will be.

[originally from svn r5729]

1 files changed, 8 insertions, 1 deletions

diff --git a/fifteen.c b/fifteen.c
index 8439faa..e31843d 100644
--- a/fifteen.c
+++ b/fifteen.c
@@ -152,7 +152,8 @@ static int perm_parity(int *perm, int n)
     return ret;
 }
 
-static char *new_game_seed(game_params *params, random_state *rs)
+static char *new_game_seed(game_params *params, random_state *rs,
+			   game_aux_info **aux)
 {
     int gap, n, i, x;
     int x1, x2, p1, p2, parity;
@@ -267,6 +268,11 @@ static char *new_game_seed(game_params *params, random_state *rs)
     return ret;
 }
 
+void game_free_aux_info(game_aux_info *aux)
+{
+    assert(!"Shouldn't happen");
+}
+
 static char *validate_seed(game_params *params, char *seed)
 {
     char *p, *err;
@@ -776,6 +782,7 @@ const struct game thegame = {
     TRUE, game_configure, custom_params,
     validate_params,
     new_game_seed,
+    game_free_aux_info,
     validate_seed,
     new_game,
     dup_game,