From 34a9d4e702be5b8abd2dc70f560040ee89f275a4 Mon Sep 17 00:00:00 2001
From: Jeremy Siek <jeremy.siek@gmail.com>
Date: Sun, 14 Jan 2001 21:10:44 +0000
Subject: [PATCH] another MIPSpro workaround

[SVN r8597]
---
 include/boost/pending/iterator_adaptors.hpp | 23 +++++++++++++++------
 1 file changed, 17 insertions(+), 6 deletions(-)

diff --git a/include/boost/pending/iterator_adaptors.hpp b/include/boost/pending/iterator_adaptors.hpp
index a2f394d..f454d10 100644
--- a/include/boost/pending/iterator_adaptors.hpp
+++ b/include/boost/pending/iterator_adaptors.hpp
@@ -235,7 +235,7 @@ namespace detail {
     return &(*i);
   }
 
-  // Dummy version for iterators that don't support member access
+  // Dummy version for non-random access iterators 
   template <class Iter, class Diff, class Cat>
   inline void advance_impl(Iter&, Diff, Cat) { }
 
@@ -250,6 +250,21 @@ namespace detail {
 #endif
   }
 
+  // Dummy version for non-bidirectional iterators 
+  template <class Iter, class Cat>
+  inline void decrement_impl(Iter&, Cat) { }
+
+  // Real version
+  template <class Iter>
+  inline typename Iter::pointer
+  decrement_impl(Iter& i, std::bidirectional_iterator_tag) {
+#ifdef __MWERKS__
+        i.policies().decrement<Iter>(i.iter());
+#else
+        i.policies().decrement(i.iter());
+#endif
+  }
+
 } // namespace detail
 
 //============================================================================
@@ -336,11 +351,7 @@ public:
     Self operator++(int) { Self tmp(*this); ++*this; return tmp; }
     
     Self& operator--() {
-#ifdef __MWERKS__
-        policies().decrement<Iterator>(iter());
-#else
-        policies().decrement(iter());
-#endif
+        detail::decrement_impl(*this, iterator_category());
         return *this;
     }