Revert "irange: introduce one-parameter variant of irange"

include/boost/range/irange.hpp

@@ -233,7 +233,7 @@ namespace boost
     {
         BOOST_ASSERT( step_size != 0 );
         BOOST_ASSERT( (step_size > 0) ? (last >= first) : (last <= first) );
-
+        
         typedef typename range_detail::integer_iterator_with_step<Integer> iterator_t;
 
         const std::ptrdiff_t sz = static_cast<std::ptrdiff_t>(step_size >= 0 ? step_size : -step_size);
@@ -241,19 +241,12 @@ namespace boost
         const Integer f = step_size >= 0 ? first : last;
         const std::ptrdiff_t num_steps = (l - f) / sz + ((l - f) % sz ? 1 : 0);
         BOOST_ASSERT(num_steps >= 0);
-
+       
         return strided_integer_range<Integer>(
             iterator_t(first, 0, step_size),
             iterator_t(first, num_steps, step_size));
     }
 
-    template<typename Integer>
-    integer_range<Integer>
-    irange(Integer last)
-    {
-        return integer_range<Integer>(static_cast<Integer>(0), last);
-    }
-
 } // namespace boost
 
 #endif // include guard