Iterator: merge several changes from trunk.

- Update iterator_facade test for #1019
  (header change already merged).
- Category of each iterator is reduced to a known category before we try to
  find a minimum. Fixes #1517.
- `function_input_iterator` from Dean Michael Berris. Fixes #2893
- Fix typo in `boost/iterator.hpp`. Fixes #3434.
- Always include `add_reference` header in iterator adaptor header.

Did not merge changes for #1427.


[SVN r70709]

include/boost/iterator.hpp

@@ -1,4 +1,4 @@
-//  interator.hpp workarounds for non-conforming standard libraries  ---------//
+//  iterator.hpp workarounds for non-conforming standard libraries  ---------//
 
 //  (C) Copyright Beman Dawes 2000. Distributed under the Boost
 //  Software License, Version 1.0. (See accompanying file

include/boost/iterator/function_input_iterator.hpp

@@ -0,0 +1,150 @@
+// Copyright 2009 (C) Dean Michael Berris <me@deanberris.com>
+// 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)
+//
+
+#ifndef BOOST_FUNCTION_INPUT_ITERATOR
+#define BOOST_FUNCTION_INPUT_ITERATOR
+
+#include <boost/mpl/if.hpp>
+#include <boost/function_types/is_function_pointer.hpp>
+#include <boost/function_types/is_function_reference.hpp>
+#include <boost/function_types/result_type.hpp>
+#include <boost/iterator/iterator_facade.hpp>
+
+namespace boost {
+
+    namespace impl {
+
+        template <class Function, class Input>
+        class function_input_iterator
+            : public iterator_facade<
+            function_input_iterator<Function, Input>,
+            typename Function::result_type,
+            single_pass_traversal_tag,
+            typename Function::result_type const &
+            >
+        {
+        public:
+            function_input_iterator() {}
+            function_input_iterator(Function & f_, Input state_ = Input()) 
+                : f(&f_), state(state_), value((*f)()) {}
+
+            void increment() {
+                value = (*f)();
+                ++state;
+            }
+
+            typename Function::result_type const & 
+                dereference() const {
+                    return value;
+            }
+
+            bool equal(function_input_iterator const & other) const {
+                return f == other.f && state == other.state;
+            }
+
+        private:
+            Function * f;
+            Input state;
+            typename Function::result_type value;
+        };
+
+        template <class Function, class Input>
+        class function_pointer_input_iterator
+            : public iterator_facade<
+            function_pointer_input_iterator<Function, Input>,
+            typename function_types::result_type<Function>::type,
+            single_pass_traversal_tag,
+            typename function_types::result_type<Function>::type const &
+            >
+        {
+        public:
+            function_pointer_input_iterator() {}
+            function_pointer_input_iterator(Function &f_, Input state_ = Input())
+                : f(f_), state(state_), value((*f)()) 
+            {}
+
+            void increment() {
+                value = (*f)();
+                ++state;
+            }
+
+            typename function_types::result_type<Function>::type const &
+                dereference() const {
+                    return value;
+            }
+
+            bool equal(function_pointer_input_iterator const & other) const {
+                return f == other.f && state == other.state;
+            }
+
+        private:
+            Function f;
+            Input state;
+            typename function_types::result_type<Function>::type value;
+        };
+
+        template <class Function, class Input>
+        class function_reference_input_iterator
+            : public function_pointer_input_iterator<Function*,Input>
+        {
+        public:
+            function_reference_input_iterator(Function & f_, Input state_ = Input())
+                : function_pointer_input_iterator<Function*,Input>(&f_, state_)
+            {}
+        };
+
+    } // namespace impl
+
+    template <class Function, class Input>
+    class function_input_iterator 
+        : public mpl::if_<
+            function_types::is_function_pointer<Function>,
+            impl::function_pointer_input_iterator<Function,Input>,
+            typename mpl::if_<
+                function_types::is_function_reference<Function>,
+                impl::function_reference_input_iterator<Function,Input>,
+                impl::function_input_iterator<Function,Input>
+            >::type
+        >::type
+    {
+        typedef typename mpl::if_<
+            function_types::is_function_pointer<Function>,
+            impl::function_pointer_input_iterator<Function,Input>,
+            typename mpl::if_<
+                function_types::is_function_reference<Function>,
+                impl::function_reference_input_iterator<Function,Input>,
+                impl::function_input_iterator<Function,Input>
+            >::type
+        >::type base_type;
+    public:
+        function_input_iterator(Function & f, Input i)
+            : base_type(f, i) {}
+    };
+
+    template <class Function, class Input>
+    inline function_input_iterator<Function, Input>
+        make_function_input_iterator(Function & f, Input state) {
+            typedef function_input_iterator<Function, Input> result_t;
+            return result_t(f, state);
+    }
+
+    template <class Function, class Input>
+    inline function_input_iterator<Function*, Input>
+        make_function_input_iterator(Function * f, Input state) {
+            typedef function_input_iterator<Function*, Input> result_t;
+            return result_t(f, state);
+    }
+
+    struct infinite {
+        infinite & operator++() { return *this; }
+        infinite & operator++(int) { return *this; }
+        bool operator==(infinite &) const { return false; };
+        bool operator==(infinite const &) const { return false; };
+    };
+}
+
+#endif
+

include/boost/iterator/iterator_adaptor.hpp

@@ -24,15 +24,9 @@
 
 #ifdef BOOST_ITERATOR_REF_CONSTNESS_KILLS_WRITABILITY
 # include <boost/type_traits/remove_reference.hpp>
-
-# if BOOST_WORKAROUND(__CODEGEARC__, BOOST_TESTED_AT(0x610))
-#   include <boost/type_traits/add_reference.hpp>
-# endif
-
-#else
-# include <boost/type_traits/add_reference.hpp>
 #endif
 
+#include <boost/type_traits/add_reference.hpp>
 #include <boost/iterator/detail/config_def.hpp>
 
 #include <boost/iterator/iterator_traits.hpp>

include/boost/iterator/zip_iterator.hpp

@@ -357,7 +357,7 @@ namespace boost {
     {
       typedef typename tuple_impl_specific::tuple_meta_transform<
           IteratorTuple
-        , iterator_traversal<>
+        , pure_traversal_tag<iterator_traversal<> >
       >::type tuple_of_traversal_tags;
           
       typedef typename tuple_impl_specific::tuple_meta_accumulate<