diff -Naur boost130a/intrusive_ptr.hpp boost130b/intrusive_ptr.hpp
--- boost130a/intrusive_ptr.hpp	Wed Jan 22 16:22:30 2003
+++ boost130b/intrusive_ptr.hpp	Thu May 15 13:48:14 2003
@@ -119,6 +119,12 @@
         return p_;
     }
 
+#if (defined __SUNPRO_CC) && (__SUNPRO_CC <= 0x530) && !(defined BOOST_NO_COMPILER_CONFIG)
+    // Sun C++ 5.3 can't handle the safe_bool idiom, so don't use it
+    operator bool () const {
+        return p_ != 0; 
+    }
+#else
     typedef T * (intrusive_ptr::*unspecified_bool_type) () const;
 
     operator unspecified_bool_type () const
@@ -131,6 +137,7 @@
     {
         return p_ == 0;
     }
+#endif
 
     void swap(intrusive_ptr & rhs)
     {
diff -Naur boost130a/scoped_array.hpp boost130b/scoped_array.hpp
--- boost130a/scoped_array.hpp	Mon Feb 10 13:54:42 2003
+++ boost130b/scoped_array.hpp	Thu May 15 13:49:37 2003
@@ -82,7 +82,12 @@
     }
 
     // implicit conversion to "bool"
-
+#if (defined __SUNPRO_CC) && (__SUNPRO_CC <= 0x530) && !(defined BOOST_NO_COMPILER_CONFIG)
+    // Sun C++ 5.3 can't handle the safe_bool idiom, so don't use it
+    operator bool () const {
+        return ptr != 0; 
+    }
+#else
     typedef T * (this_type::*unspecified_bool_type)() const;
 
     operator unspecified_bool_type() const // never throws
@@ -94,6 +99,7 @@
     {
         return ptr == 0;
     }
+#endif
 
     void swap(scoped_array & b) // never throws
     {
diff -Naur boost130a/scoped_ptr.hpp boost130b/scoped_ptr.hpp
--- boost130a/scoped_ptr.hpp	Mon Feb 10 13:54:44 2003
+++ boost130b/scoped_ptr.hpp	Thu May 15 13:52:08 2003
@@ -101,7 +101,12 @@
     }
 
     // implicit conversion to "bool"
-
+#if (defined __SUNPRO_CC) && (__SUNPRO_CC <= 0x530) && !(defined BOOST_NO_COMPILER_CONFIG)
+    // Sun C++ 5.3 can't handle the safe_bool idiom, so don't use it
+    operator bool () const {
+        return ptr != 0; 
+    }
+#else
     typedef T * (this_type::*unspecified_bool_type)() const;
 
     operator unspecified_bool_type() const // never throws
@@ -113,7 +118,7 @@
     {
         return ptr == 0;
     }
-
+#endif
     void swap(scoped_ptr & b) // never throws
     {
         T * tmp = b.ptr;
diff -Naur boost130a/shared_array.hpp boost130b/shared_array.hpp
--- boost130a/shared_array.hpp	Wed Oct 23 17:55:16 2002
+++ boost130b/shared_array.hpp	Thu May 15 11:59:52 2003
@@ -93,7 +93,12 @@
     }
 
     // implicit conversion to "bool"
-
+#if (defined __SUNPRO_CC) && (__SUNPRO_CC <= 0x530) && !(defined BOOST_NO_COMPILER_CONFIG)
+    // Sun C++ 5.3 can't handle the safe_bool idiom, so don't use it
+    operator bool () const {
+        return px != 0; 
+    }
+#else
     typedef T * (this_type::*unspecified_bool_type)() const;
 
     operator unspecified_bool_type() const // never throws
@@ -105,6 +110,7 @@
     {
         return px == 0;
     }
+#endif
 
     bool unique() const // never throws
     {
diff -Naur boost130a/shared_ptr.hpp boost130b/shared_ptr.hpp
--- boost130a/shared_ptr.hpp	Mon Feb  3 14:48:34 2003
+++ boost130b/shared_ptr.hpp	Thu May 15 13:59:40 2003
@@ -245,7 +245,12 @@
     }
 
     // implicit conversion to "bool"
-
+#if (defined __SUNPRO_CC) && (__SUNPRO_CC <= 0x530) && !(defined BOOST_NO_COMPILER_CONFIG)
+    // Sun C++ 5.3 can't handle the safe_bool idiom, so don't use it
+    operator bool () const {
+        return px != 0; 
+    }
+#else
     typedef T * (this_type::*unspecified_bool_type)() const;
 
     operator unspecified_bool_type() const // never throws
@@ -259,6 +264,7 @@
     {
         return px == 0;
     }
+#endif
 
     bool unique() const // never throws
     {