Creatively apply patch from #2603. Refs #2603.

[SVN r76111]

include/boost/smart_ptr/owner_less.hpp

@@ -0,0 +1,57 @@
+#ifndef BOOST_SMART_PTR_OWNER_LESS_HPP_INCLUDED
+#define BOOST_SMART_PTR_OWNER_LESS_HPP_INCLUDED
+
+//
+//  owner_less.hpp
+//
+//  Copyright (c) 2008 Frank Mori Hess
+//
+//  Distributed under the Boost Software License, Version 1.0. (See
+//  accompanying file LICENSE_1_0.txt or copy at
+//  http://www.boost.org/LICENSE_1_0.txt)
+//
+//  See http://www.boost.org/libs/smart_ptr/smart_ptr.htm for documentation.
+//
+
+#include <functional>
+
+namespace boost
+{
+  template<typename T> class shared_ptr;
+  template<typename T> class weak_ptr;
+
+  namespace detail
+  {
+    template<typename T, typename U>
+      struct generic_owner_less : public std::binary_function<T, T, bool>
+    {
+      bool operator()(const T &lhs, const T &rhs) const
+      {
+        return lhs.owner_before(rhs);
+      }
+      bool operator()(const T &lhs, const U &rhs) const
+      {
+        return lhs.owner_before(rhs);
+      }
+      bool operator()(const U &lhs, const T &rhs) const
+      {
+        return lhs.owner_before(rhs);
+      }
+    };
+  } // namespace detail
+
+  template<typename T> struct owner_less;
+
+  template<typename T>
+    struct owner_less<shared_ptr<T> >:
+    public detail::generic_owner_less<shared_ptr<T>, weak_ptr<T> >
+  {};
+
+  template<typename T>
+    struct owner_less<weak_ptr<T> >:
+    public detail::generic_owner_less<weak_ptr<T>, shared_ptr<T> >
+  {};
+
+} // namespace boost
+
+#endif  // #ifndef BOOST_SMART_PTR_OWNER_LESS_HPP_INCLUDED

include/boost/smart_ptr/shared_ptr.hpp

@@ -443,7 +443,12 @@ public:
         pn.swap(other.pn);
     }
 
-    template<class Y> bool _internal_less(shared_ptr<Y> const & rhs) const
+    template<class Y> bool owner_before( shared_ptr<Y> const & rhs ) const
+    {
+        return pn < rhs.pn;
+    }
+
+    template<class Y> bool owner_before( weak_ptr<Y> const & rhs ) const
     {
         return pn < rhs.pn;
     }
@@ -499,7 +504,7 @@ template<class T> inline bool operator!=(shared_ptr<T> const & a, shared_ptr<T>
 
 template<class T, class U> inline bool operator<(shared_ptr<T> const & a, shared_ptr<U> const & b)
 {
-    return a._internal_less(b);
+    return a.owner_before( b );
 }
 
 template<class T> inline void swap(shared_ptr<T> & a, shared_ptr<T> & b)

include/boost/smart_ptr/weak_ptr.hpp

@@ -206,7 +206,12 @@ public:
         pn = r.pn;
     }
 
-    template<class Y> bool _internal_less(weak_ptr<Y> const & rhs) const
+    template<class Y> bool owner_before( weak_ptr<Y> const & rhs ) const
+    {
+        return pn < rhs.pn;
+    }
+
+    template<class Y> bool owner_before( shared_ptr<Y> const & rhs ) const
     {
         return pn < rhs.pn;
     }
@@ -230,7 +235,7 @@ private:
 
 template<class T, class U> inline bool operator<(weak_ptr<T> const & a, weak_ptr<U> const & b)
 {
-    return a._internal_less(b);
+    return a.owner_before( b );
 }
 
 template<class T> void swap(weak_ptr<T> & a, weak_ptr<T> & b)