* ext/bigdecimal/bigdecimal.c (BigDecimal_coerce): support coerce with a

  Rational.  The precision used for instantiate a BigDecimal from the
  given Rational is obtained from the receiver BigDecimal.
* test/bigdecimal/test_bigdecimal.rb (test_coerce): add a test for the
  above change.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@31868 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 11 insertions, 2 deletions

diff --git a/ext/bigdecimal/bigdecimal.c b/ext/bigdecimal/bigdecimal.c
index cd960f4b87..571bf41461 100644
--- a/ext/bigdecimal/bigdecimal.c
+++ b/ext/bigdecimal/bigdecimal.c
@@ -675,12 +675,21 @@ BigDecimal_coerce(VALUE self, VALUE other)
     ENTER(2);
     VALUE obj;
     Real *b;
+
     if (TYPE(other) == T_FLOAT) {
 	obj = rb_assoc_new(other, BigDecimal_to_f(self));
-    } else {
-	GUARD_OBJ(b,GetVpValue(other,1));
+    }
+    else {
+	if (TYPE(other) == T_RATIONAL) {
+	    Real* pv = DATA_PTR(self);
+	    GUARD_OBJ(b, GetVpValueWithPrec(other, pv->Prec*VpBaseFig(), 1));
+	}
+	else {
+	    GUARD_OBJ(b, GetVpValue(other, 1));
+	}
 	obj = rb_assoc_new(b->obj, self);
     }
+
     return obj;
 }