[boost] [range] patch to fix begin() and end()

29 Jan 2005

The following trivial use of Boost.Range fails to compile:

   #include <boost/range/begin.hpp>

   template<class Rng>
   void foo(Rng const& rng)
   {
       boost::begin(rng);
   }

   int main()
   {
       char* sz = "hello";
       foo( sz );
   }


With g++, I get:

$ g++ -I$BOOST_ROOT test.cpp
/cygdrive/c/boost/cvs/boost/boost/range/begin.hpp: In function `typename
    boost::range_const_iterator<C>::type 
boost::range_detail::begin(const C&)
    [with C = char*]':
/cygdrive/c/boost/cvs/boost/boost/range/begin.hpp:162:   instantiated 
from `typename boost
::range_const_iterator<C>::type boost::begin(const T&) [with T = char*]'
test.cpp:6:   instantiated from `void foo(const Rng&) [with Rng = char*]'
test.cpp:12:   instantiated from here
/cygdrive/c/boost/cvs/boost/boost/range/begin.hpp:40: error: request for 
member
    `begin' in `c', which is of non-aggregate type `char* const'


The attached patch fixes the problem for both boost::begin() and 
boost::end(). I have verified that the range tests pass with this change.


-- 
Eric Niebler
Boost Consulting
www.boost-consulting.com

Index: begin.hpp
===================================================================
RCS file: /cvsroot/boost/boost/boost/range/begin.hpp,v
retrieving revision 1.11
diff -b -d -u -r1.11 begin.hpp

--- begin.hpp	5 Jan 2005 18:19:30 -0000	1.11
+++ begin.hpp	29 Jan 2005 00:07:13 -0000
@@ -111,20 +111,40 @@
         return s;
     }
     
+    inline const char* begin( const char*const& s )
+    {
+        return s;
+    }
+    
     inline char* begin( char*& s )
     {
         return s;
     }
     
+    inline char* begin( char*const& s )
+    {
+        return s;
+    }
+    
     inline const wchar_t* begin( const wchar_t*& s )
     {
         return s;
     }
     
+    inline const wchar_t* begin( const wchar_t*const& s )
+    {
+        return s;
+    }
+    
     inline wchar_t* begin( wchar_t*& s )
     {
         return s;
     }
+
+    inline wchar_t* begin( wchar_t*const& s )
+    {
+        return s;
+    }
 #endif    
 
 } // namespace 'range_detail'
Index: end.hpp
===================================================================
RCS file: /cvsroot/boost/boost/boost/range/end.hpp,v
retrieving revision 1.14
diff -b -d -u -r1.14 end.hpp
--- end.hpp	5 Jan 2005 18:19:31 -0000	1.14
+++ end.hpp	29 Jan 2005 00:07:13 -0000
@@ -111,20 +111,40 @@
             return range_detail::str_end( s );
         }
 
+        inline char* end( char*const& s )
+        {
+            return range_detail::str_end( s );
+        }
+
         inline wchar_t* end( wchar_t*& s )
         {
             return range_detail::str_end( s );
         }
 
+        inline wchar_t* end( wchar_t*const& s )
+        {
+            return range_detail::str_end( s );
+        }
+
         inline const char* end( const char*& s )
         {
             return range_detail::str_end( s );
         }
 
+        inline const char* end( const char*const& s )
+        {
+            return range_detail::str_end( s );
+        }
+
         inline const wchar_t* end( const wchar_t*& s )
         {
             return range_detail::str_end( s );
         }
+
+        inline const wchar_t* end( const wchar_t*const& s )
+        {
+            return range_detail::str_end( s );
+        }
 #endif
         
 } // namespace 'range_detail'

    