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-rw-r--r--compar.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/compar.c b/compar.c
index 6762786..c89c752 100644
--- a/compar.c
+++ b/compar.c
@@ -32,6 +32,26 @@ rb_cmperr(VALUE x, VALUE y)
}
static VALUE
+invcmp_recursive(VALUE x, VALUE y, int recursive)
+{
+ if (recursive) return Qnil;
+ return rb_check_funcall(y, cmp, 1, &x);
+}
+
+VALUE
+rb_invcmp(VALUE x, VALUE y)
+{
+ VALUE invcmp = rb_exec_recursive(invcmp_recursive, x, y);
+ if (invcmp == Qundef || NIL_P(invcmp)) {
+ return Qnil;
+ }
+ else {
+ int result = -rb_cmpint(invcmp, x, y);
+ return INT2FIX(result);
+ }
+}
+
+static VALUE
cmp_eq(VALUE *a)
{
VALUE c = rb_funcall(a[0], cmp, 1, a[1]);