diff options
| -rw-r--r-- | ChangeLog | 3 | ||||
| -rw-r--r-- | array.c | 7 |
2 files changed, 8 insertions, 2 deletions
@@ -6,6 +6,9 @@ Tue Oct 2 08:25:50 2007 Yukihiro Matsumoto <matz@ruby-lang.org> * array.c (rb_ary_combination): RDoc update to clarify. a patch from David Flanagan. [ruby-core:12344] + * array.c (rb_ary_permutation): small dirty hack by Matz to avoid + arrays on stack. + Tue Oct 2 07:01:05 2007 Koichi Sasada <ko1@atdot.net> * proc.c (proc_dup): proc->block.proc should be self. @@ -3036,8 +3036,11 @@ rb_ary_permutation(VALUE ary, VALUE num) } else { /* this is the general case */ ary = rb_ary_dup(ary); /* private defensive copy of ary */ - long p[n]; - int used[n]; + volatile VALUE t0 = rb_str_new(0, n*sizeof(long)); + long *p = (long*)RSTRING_PTR(t0); /* array indexes of current permutation */ + volatile VALUE t1 = rb_str_new(0, n*sizeof(int)); + int *used = (int*)RSTRING_PTR(t1); /* booleans: which indexes are already used */ + for(i = 0; i < n; i++) used[i] = 0; /* initialize array */ permute0(n,r,p,0,used,ary); /* compute and yield permutations */ |