From a929adc492abb4bd22844061a713a3227e4bd7ff Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Thorsten=20J=C3=B8rgen=20Ottosen?=
 <thorsten.ottosen@gmail.com>
Date: Sat, 21 Aug 2004 21:54:02 +0000
Subject: [PATCH] *** empty log message ***

[SVN r24638]
---
 include/boost/range/iterator_range.hpp | 11 +++++++++++
 test/sub_range.cpp                     |  2 ++
 2 files changed, 13 insertions(+)

diff --git a/include/boost/range/iterator_range.hpp b/include/boost/range/iterator_range.hpp
index ee10e37..4469be9 100755
--- a/include/boost/range/iterator_range.hpp
+++ b/include/boost/range/iterator_range.hpp
@@ -14,6 +14,7 @@
 #include <boost/range/config.hpp>
 #include <boost/range/begin.hpp>
 #include <boost/range/end.hpp>
+#include <boost/range/empty.hpp>
 #include <boost/iterator/iterator_traits.hpp>
 #include <iterator>
 #include <algorithm>
@@ -191,6 +192,16 @@ namespace boost {
 
 //  iterator range free-standing operators ---------------------------//
 
+        template< class Iterator >
+        inline bool empty( const iterator_range<Iterator>& r )
+        {
+            //
+            // this will preserve the well-defined empty() even 
+            // though 'r' is singular.
+            //
+            return r.empty();
+        }
+        
         //! iterator_range output operator
         /*!
             Output the range to an ostream. Elements are outputed
diff --git a/test/sub_range.cpp b/test/sub_range.cpp
index 5fefb30..cba6c14 100755
--- a/test/sub_range.cpp
+++ b/test/sub_range.cpp
@@ -121,6 +121,8 @@ void check_iterator_range()
     BOOST_CHECK( singular_srange.empty() );
     BOOST_CHECK( singular_srange.size() == 0 );
 
+    BOOST_CHECK( empty( singular_irange ) );
+    BOOST_CHECK( empty( singular_srange ) );
 }