--- close.hpp.orig	2007-05-27 09:58:09.000000000 -0700
+++ close.hpp	2007-05-27 10:00:21.000000000 -0700
@@ -106,8 +106,12 @@
         typedef typename category_of<T>::type category;
         const bool in =  is_convertible<category, input>::value &&
                         !is_convertible<category, output>::value;
-        if (in == ((which & BOOST_IOS::in) != 0))
+        const bool out =  is_convertible<category, output>::value &&
+                        !is_convertible<category, bidirectional>::value;
+        if ((in && ((which & BOOST_IOS::in) != 0)) ||
+            (out && ((which & BOOST_IOS::out) != 0))) {
             t.close();
+        }
     }
     template<typename T, typename Sink>
     static void close(T& t, Sink& snk, BOOST_IOS::openmode which)
@@ -115,7 +119,10 @@
         typedef typename category_of<T>::type category;
         const bool in =  is_convertible<category, input>::value &&
                         !is_convertible<category, output>::value;
-        if (in == ((which & BOOST_IOS::in) != 0)) {
+        const bool out =  is_convertible<category, output>::value &&
+                        !is_convertible<category, bidirectional>::value;
+        if ((in && ((which & BOOST_IOS::in) != 0)) ||
+            (out && ((which & BOOST_IOS::out) != 0))) {
             non_blocking_adapter<Sink> nb(snk);
             t.close(nb);
         }