Merge pull request #188 from boostorg/develop

Post beta merge

doc/adapted.qbk

@@ -23,19 +23,6 @@ various data structures, non-intrusively, as full fledged Fusion sequences.
     #include <boost/fusion/adapted.hpp>
     #include <boost/fusion/include/adapted.hpp>
 
-Fusion sequences may also be adapted as fully conforming __mpl__ sequences (see
-__intrinsics__). That way, we can have 2-way adaptation to and from __mpl__ and
-Fusion. To make Fusion sequences fully conforming __mpl__ sequences, include:
-
-    #include <boost/fusion/mpl.hpp>
-
-If you want bi-directional adaptation to and from __mpl__ and Fusion, simply
-include:
-
-    #include <boost/fusion/include/mpl.hpp>
-
-The header includes all the necessary headers.
-
 [section:array Array]
 
 This module provides adapters for arrays. Including the module
@@ -145,6 +132,21 @@ header makes all __mpl__ sequences fully conforming fusion sequences.
     std::cout << __at_c__<0>(v) << std::endl;
     std::cout << __at_c__<1>(v) << std::endl;
 
+[heading Bi-directional adaptation]
+
+Fusion sequences may also be adapted as fully conforming __mpl__ sequences (see
+__intrinsics__). That way, we can have 2-way adaptation to and from __mpl__ and
+Fusion. To make Fusion sequences fully conforming __mpl__ sequences, include:
+
+    #include <boost/fusion/mpl.hpp>
+
+If you want bi-directional adaptation to and from __mpl__ and Fusion, simply
+include:
+
+    #include <boost/fusion/include/mpl.hpp>
+
+The header includes all the necessary headers.
+
 [heading See also]
 
 __mpl__

doc/sequence.qbk

@@ -1522,6 +1522,16 @@ each element. Analogously, the global `operator>>` has been overloaded
 to extract __sequence__(s) from generic input streams by recursively
 calling `operator>>` for each element.
 
+Please note that, to display your adapted types via fusion IO system,
+corresponding overloaded operators should be introduced to same namespace
+of the type.
+
+    namespace your_awesome_library
+    {
+        using boost::fusion::operators::operator>>; // for input
+        using boost::fusion::operators::operator<<; // for output
+        ...
+
 The default delimiter between the elements is space, and the __sequence__
 is enclosed in parenthesis. For Example:
 

doc/view.qbk

@@ -93,10 +93,9 @@ presents only those elements for which its predicate evaluates to
 [heading Template parameters]
 
 [table
-    [[Parameter]            [Description]               [Default]]
-    [[`Sequence`]           [A __forward_sequence__]    []]
-    [[`Pred`]               [Unary Metafunction
-                             returning an `mpl::bool_`] []]
+    [[Parameter]            [Description]                       [Default]]
+    [[`Sequence`]           [A __forward_sequence__]            []]
+    [[`Pred`]               [A unary __mpl_lambda_expression__] []]
 ]
 
 [heading Model of]
@@ -271,7 +270,7 @@ defined in the implemented models.
 [heading Description]
 
 `zip_view` presents a view which iterates over a collection of __sequence__(s) in parallel. A `zip_view`
-is constructed from a __sequence__ of references to the component __sequence__s.
+is constructed from a __sequence__ of references to the component `__sequence__`s.
 
 [heading Header]
 
@@ -287,7 +286,7 @@ is constructed from a __sequence__ of references to the component __sequence__s.
 
 [table
     [[Parameter]            [Description]                   [Default]]
-    [[`Sequences`]          [A __forward_sequence__ of references to other Fusion __sequence__s]        []]
+    [[`Sequences`]          [A __forward_sequence__ of references to other Fusion `__sequence__`s]        []]
 ]
 
 [heading Model of]
@@ -309,7 +308,7 @@ defined in __forward_sequence__.
 
 [table
     [[Expression]           [Semantics]]
-    [[`ZV(s)`]              [Creates a `zip_view` given a sequence of references to the component __sequence__s.]]
+    [[`ZV(s)`]              [Creates a `zip_view` given a sequence of references to the component `__sequence__`s.]]
     [[`ZV(zv1)`]             [Copy constructs a `zip_view` from another `zip_view`, `zv`.]]
     [[`zv1 = zv2`]           [Assigns to a `zip_view`, `zv`, from another `zip_view`, `zv2`.]]
 ]

include/boost/fusion/algorithm/iteration/detail/for_each.hpp

@@ -30,7 +30,7 @@ namespace detail
     template <typename First, typename Last, typename F>
     BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
     inline void
-    for_each_linear(First const& first, Last const& last, F const& f, mpl::false_)
+    for_each_linear(First const& first, Last const& last, F& f, mpl::false_)
     {
         f(*first);
         detail::for_each_linear(fusion::next(first), last, f, 
@@ -41,7 +41,7 @@ namespace detail
     template <typename Sequence, typename F, typename Tag>
     BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
     inline void
-    for_each_dispatch(Sequence& seq, F const& f, Tag)
+    for_each_dispatch(Sequence& seq, F& f, Tag)
     {
         detail::for_each_linear(
                                 fusion::begin(seq)
@@ -57,7 +57,7 @@ namespace detail
     {
         template<typename I0, typename F>
         BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
-        static void call(I0 const& i0, F const& f)
+        static void call(I0 const& i0, F& f)
         {
             f(*i0);
             typedef typename result_of::next<I0>::type I1;
@@ -78,7 +78,7 @@ namespace detail
     {
         template<typename I0, typename F>
         BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
-        static void call(I0 const& i0, F const& f)
+        static void call(I0 const& i0, F& f)
         {
             f(*i0);
             typedef typename result_of::next<I0>::type I1;
@@ -95,7 +95,7 @@ namespace detail
     {
         template<typename I0, typename F>
         BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
-        static void call(I0 const& i0, F const& f)
+        static void call(I0 const& i0, F& f)
         {
             f(*i0);
             typedef typename result_of::next<I0>::type I1;
@@ -109,7 +109,7 @@ namespace detail
     {
         template<typename I0, typename F>
         BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
-        static void call(I0 const& i0, F const& f)
+        static void call(I0 const& i0, F& f)
         {
             f(*i0);
         }
@@ -128,7 +128,7 @@ namespace detail
     template <typename Sequence, typename F>
     BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
     inline void
-    for_each_dispatch(Sequence& seq, F const& f, random_access_traversal_tag)
+    for_each_dispatch(Sequence& seq, F& f, random_access_traversal_tag)
     {
         typedef typename result_of::begin<Sequence>::type begin;
         typedef typename result_of::end<Sequence>::type end;
@@ -138,7 +138,7 @@ namespace detail
     template <typename Sequence, typename F>
     BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
     inline void
-    for_each(Sequence& seq, F const& f, mpl::false_) // unsegmented implementation
+    for_each(Sequence& seq, F& f, mpl::false_) // unsegmented implementation
     {
         detail::for_each_dispatch(seq, f, typename traits::category_of<Sequence>::type());
     }

include/boost/fusion/algorithm/iteration/detail/segmented_for_each.hpp

@@ -19,11 +19,11 @@ namespace boost { namespace fusion { namespace detail
     struct segmented_for_each_fun
     {
         BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
-        explicit segmented_for_each_fun(Fun const& f)
+        explicit segmented_for_each_fun(Fun& f)
           : fun(f)
         {}
 
-        Fun const& fun;
+        Fun& fun;
 
         template <typename Sequence, typename State, typename Context>
         struct apply
@@ -43,7 +43,7 @@ namespace boost { namespace fusion { namespace detail
     template <typename Sequence, typename F>
     BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
     inline void
-    for_each(Sequence& seq, F const& f, mpl::true_) // segmented implementation
+    for_each(Sequence& seq, F& f, mpl::true_) // segmented implementation
     {
         fusion::segmented_fold_until(seq, void_(), segmented_for_each_fun<F>(f));
     }

include/boost/fusion/algorithm/iteration/for_each.hpp

@@ -1,6 +1,7 @@
 /*=============================================================================
     Copyright (c) 2001-2007 Joel de Guzman
     Copyright (c) 2007 Dan Marsden
+    Copyright (c) 2018 Kohei Takahashi
 
     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)
@@ -13,7 +14,7 @@
 #include <boost/fusion/algorithm/iteration/detail/segmented_for_each.hpp>
 #include <boost/fusion/support/is_segmented.hpp>
 #include <boost/fusion/support/is_sequence.hpp>
-#include <boost/utility/enable_if.hpp>
+#include <boost/core/enable_if.hpp>
 
 namespace boost { namespace fusion
 {
@@ -28,24 +29,16 @@ namespace boost { namespace fusion
 
     template <typename Sequence, typename F>
     BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
-    inline typename
-        enable_if<
-            traits::is_sequence<Sequence>
-          , void
-        >::type
-    for_each(Sequence& seq, F const& f)
+    inline typename enable_if<traits::is_sequence<Sequence> >::type
+    for_each(Sequence& seq, F f)
     {
         detail::for_each(seq, f, typename traits::is_segmented<Sequence>::type());
     }
 
     template <typename Sequence, typename F>
     BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
-    inline typename
-        enable_if<
-            traits::is_sequence<Sequence>
-          , void
-        >::type
-    for_each(Sequence const& seq, F const& f)
+    inline typename enable_if<traits::is_sequence<Sequence> >::type
+    for_each(Sequence const& seq, F f)
     {
         detail::for_each(seq, f, typename traits::is_segmented<Sequence>::type());
     }

include/boost/fusion/algorithm/iteration/for_each_fwd.hpp

@@ -1,5 +1,6 @@
 /*=============================================================================
     Copyright (c) 2011 Eric Niebler
+    Copyright (c) 2018 Kohei Takahashi
 
     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)
@@ -9,7 +10,7 @@
 
 #include <boost/fusion/support/config.hpp>
 #include <boost/fusion/support/is_sequence.hpp>
-#include <boost/utility/enable_if.hpp>
+#include <boost/core/enable_if.hpp>
 
 namespace boost { namespace fusion
 {
@@ -21,21 +22,13 @@ namespace boost { namespace fusion
 
     template <typename Sequence, typename F>
     BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
-    inline typename
-        enable_if<
-            traits::is_sequence<Sequence>
-          , void
-        >::type
-    for_each(Sequence& seq, F const& f);
+    inline typename enable_if<traits::is_sequence<Sequence> >::type
+    for_each(Sequence& seq, F f);
 
     template <typename Sequence, typename F>
     BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
-    inline typename
-        enable_if<
-            traits::is_sequence<Sequence>
-          , void
-        >::type
-    for_each(Sequence const& seq, F const& f);
+    inline typename enable_if<traits::is_sequence<Sequence> >::type
+    for_each(Sequence const& seq, F f);
 }}
 
 #endif

include/boost/fusion/view/transform_view/detail/apply_transform_result.hpp

@@ -1,38 +0,0 @@
-/*=============================================================================
-    Copyright (c) 2001-2011 Joel de Guzman
-    Copyright (c) 2007 Dan Marsden
-
-    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)
-==============================================================================*/
-#if !defined(BOOST_FUSION_APPLY_TRANSFORM_RESULT_02092006_1936)
-#define BOOST_FUSION_APPLY_TRANSFORM_RESULT_02092006_1936
-
-#include <boost/fusion/support/config.hpp>
-#include <boost/utility/result_of.hpp>
-
-namespace boost { namespace fusion
-{
-    struct void_;
-    
-    namespace detail
-    {
-        template <typename F>
-        struct apply_transform_result
-        {
-            template <typename T0, typename T1 = void_>
-            struct apply
-                : boost::result_of<F(T0, T1)>
-            {};
-
-            template <typename T0>
-            struct apply<T0, void_>
-                : boost::result_of<F(T0)>
-            {};
-        };
-    }
-}}
-
-#endif
-
-

include/boost/fusion/view/transform_view/detail/at_impl.hpp

@@ -1,6 +1,7 @@
 /*=============================================================================
     Copyright (c) 2001-2011 Joel de Guzman
     Copyright (c) 2005-2006 Dan Marsden
+    Copyright (c) 2018 Kohei Takahashi
 
     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)
@@ -9,9 +10,8 @@
 #define BOOST_FUSION_AT_IMPL_20061029_1946
 
 #include <boost/fusion/support/config.hpp>
-#include <boost/mpl/apply.hpp>
-#include <boost/fusion/view/transform_view/detail/apply_transform_result.hpp>
 #include <boost/fusion/sequence/intrinsic/at.hpp>
+#include <boost/utility/result_of.hpp>
 
 namespace boost { namespace fusion {
     struct transform_view_tag;
@@ -29,9 +29,8 @@ namespace boost { namespace fusion {
             struct apply
             {
                 typedef typename Seq::transform_type F;
-                typedef detail::apply_transform_result<F> transform_type;
-                typedef typename boost::fusion::result_of::at<typename Seq::sequence_type, N>::type value_type;
-                typedef typename mpl::apply<transform_type, value_type>::type type;
+                typedef typename result_of::at<typename Seq::sequence_type, N>::type value_type;
+                typedef typename boost::result_of<F(value_type)>::type type;
 
                 BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
                 static type call(Seq& seq)
@@ -48,10 +47,9 @@ namespace boost { namespace fusion {
             struct apply
             {
                 typedef typename Seq::transform_type F;
-                typedef detail::apply_transform_result<F> transform_type;
-                typedef typename boost::fusion::result_of::at<typename Seq::sequence1_type, N>::type value1_type;
-                typedef typename boost::fusion::result_of::at<typename Seq::sequence2_type, N>::type value2_type;
-                typedef typename mpl::apply<transform_type, value1_type, value2_type>::type type;
+                typedef typename result_of::at<typename Seq::sequence1_type, N>::type value1_type;
+                typedef typename result_of::at<typename Seq::sequence2_type, N>::type value2_type;
+                typedef typename boost::result_of<F(value1_type, value2_type)>::type type;
 
                 BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
                 static type call(Seq& seq)

include/boost/fusion/view/transform_view/detail/deref_impl.hpp

@@ -1,5 +1,6 @@
 /*=============================================================================
     Copyright (c) 2001-2011 Joel de Guzman
+    Copyright (c) 2018 Kohei Takahashi
 
     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)
@@ -8,10 +9,8 @@
 #define FUSION_DEREF_IMPL_07162005_1026
 
 #include <boost/fusion/support/config.hpp>
-#include <boost/mpl/apply.hpp>
 #include <boost/fusion/iterator/deref.hpp>
-#include <boost/fusion/iterator/value_of.hpp>
-#include <boost/fusion/view/transform_view/detail/apply_transform_result.hpp>
+#include <boost/utility/result_of.hpp>
 
 namespace boost { namespace fusion
 {
@@ -34,8 +33,8 @@ namespace boost { namespace fusion
                     result_of::deref<typename Iterator::first_type>::type
                 value_type;
 
-                typedef detail::apply_transform_result<typename Iterator::transform_type> transform_type;
-                typedef typename mpl::apply<transform_type, value_type>::type type;
+                typedef typename Iterator::transform_type F;
+                typedef typename boost::result_of<F(value_type)>::type type;
 
                 BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
                 static type
@@ -60,8 +59,8 @@ namespace boost { namespace fusion
                     result_of::deref<typename Iterator::first2_type>::type
                 value2_type;
 
-                typedef detail::apply_transform_result<typename Iterator::transform_type> transform_type;
-                typedef typename mpl::apply<transform_type, value1_type, value2_type>::type type;
+                typedef typename Iterator::transform_type F;
+                typedef typename boost::result_of<F(value1_type, value2_type)>::type type;
 
                 BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
                 static type
@@ -70,7 +69,7 @@ namespace boost { namespace fusion
                     return i.f(*i.first1, *i.first2);
                 }
             };
-        };    
+        };
     }
 }}
 

include/boost/fusion/view/transform_view/detail/value_at_impl.hpp

@@ -1,6 +1,7 @@
 /*=============================================================================
     Copyright (c) 2001-2011 Joel de Guzman
     Copyright (c) 2005-2006 Dan Marsden
+    Copyright (c) 2018 Kohei Takahashi
 
     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)
@@ -9,9 +10,8 @@
 #define BOOST_FUSION_VALUE_AT_IMPL_20061101_0745
 
 #include <boost/fusion/support/config.hpp>
-#include <boost/mpl/apply.hpp>
-#include <boost/fusion/view/transform_view/detail/apply_transform_result.hpp>
 #include <boost/fusion/sequence/intrinsic/value_at.hpp>
+#include <boost/utility/result_of.hpp>
 
 namespace boost { namespace fusion {
     struct transform_view_tag;
@@ -29,9 +29,8 @@ namespace boost { namespace fusion {
             struct apply
             {
                 typedef typename Seq::transform_type F;
-                typedef detail::apply_transform_result<F> transform_type;
-                typedef typename boost::fusion::result_of::value_at<typename Seq::sequence_type, N>::type value_type;
-                typedef typename mpl::apply<transform_type, value_type>::type type;
+                typedef typename result_of::value_at<typename Seq::sequence_type, N>::type value_type;
+                typedef typename boost::result_of<F(value_type)>::type type;
             };
         };
 
@@ -42,10 +41,9 @@ namespace boost { namespace fusion {
             struct apply
             {
                 typedef typename Seq::transform_type F;
-                typedef detail::apply_transform_result<F> transform_type;
-                typedef typename boost::fusion::result_of::value_at<typename Seq::sequence1_type, N>::type value1_type;
-                typedef typename boost::fusion::result_of::value_at<typename Seq::sequence2_type, N>::type value2_type;
-                typedef typename mpl::apply<transform_type, value1_type, value2_type>::type type;
+                typedef typename result_of::value_at<typename Seq::sequence1_type, N>::type value1_type;
+                typedef typename result_of::value_at<typename Seq::sequence2_type, N>::type value2_type;
+                typedef typename boost::result_of<F(value1_type, value2_type)>::type type;
             };
         };
     }

include/boost/fusion/view/transform_view/detail/value_of_impl.hpp

@@ -1,5 +1,6 @@
 /*=============================================================================
     Copyright (c) 2001-2011 Joel de Guzman
+    Copyright (c) 2018 Kohei Takahashi
 
     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)
@@ -8,9 +9,8 @@
 #define FUSION_VALUE_OF_IMPL_07162005_1030
 
 #include <boost/fusion/support/config.hpp>
-#include <boost/mpl/apply.hpp>
 #include <boost/fusion/iterator/value_of.hpp>
-#include <boost/fusion/view/transform_view/detail/apply_transform_result.hpp>
+#include <boost/utility/result_of.hpp>
 
 namespace boost { namespace fusion
 {
@@ -33,8 +33,8 @@ namespace boost { namespace fusion
                     result_of::value_of<typename Iterator::first_type>::type
                 value_type;
 
-                typedef detail::apply_transform_result<typename Iterator::transform_type> transform_type;
-                typedef typename mpl::apply<transform_type, value_type>::type type;
+                typedef typename Iterator::transform_type F;
+                typedef typename boost::result_of<F(value_type)>::type type;
             };
         };
 
@@ -52,8 +52,8 @@ namespace boost { namespace fusion
                     result_of::value_of<typename Iterator::first2_type>::type
                 value2_type;
 
-                typedef detail::apply_transform_result<typename Iterator::transform_type> transform_type;
-                typedef typename mpl::apply<transform_type, value1_type, value2_type>::type type;
+                typedef typename Iterator::transform_type F;
+                typedef typename boost::result_of<F(value1_type, value2_type)>::type type;
             };
         };
     }

test/Jamfile

@@ -66,6 +66,7 @@ project
     [ run algorithm/zip2.cpp ]
     [ run algorithm/zip_ignore.cpp ]
     [ run algorithm/flatten.cpp ]
+    [ compile algorithm/ticket-5490.cpp ]
 
     [ run sequence/as_deque.cpp ]
     [ run sequence/as_list.cpp ]

test/algorithm/for_each.cpp

@@ -1,13 +1,15 @@
 /*=============================================================================
     Copyright (c) 2001-2011 Joel de Guzman
+    Copyright (c) 2018 Kohei Takahashi
 
     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)
 ==============================================================================*/
-#include <boost/detail/lightweight_test.hpp>
+#include <boost/core/lightweight_test.hpp>
 #include <boost/fusion/container/vector/vector.hpp>
 #include <boost/fusion/adapted/mpl.hpp>
 #include <boost/fusion/sequence/io/out.hpp>
+#include <boost/fusion/sequence/comparison/equal_to.hpp>
 #include <boost/fusion/algorithm/iteration/for_each.hpp>
 #include <boost/mpl/vector_c.hpp>
 
@@ -29,6 +31,15 @@ struct increment
     }
 };
 
+struct mutable_increment : increment
+{
+    template <typename T>
+    void operator()(T& v)
+    {
+        return increment::operator()(v);
+    }
+};
+
 int
 main()
 {
@@ -44,9 +55,20 @@ main()
     }
 
     {
+        char const ruby[] = "Ruby";
         typedef vector<int, char, double, char const*> vector_type;
-        vector_type v(1, 'x', 3.3, "Ruby");
+        vector_type v(1, 'x', 3.3, ruby);
         for_each(v, increment());
+        BOOST_TEST_EQ(v, vector_type(2, 'y', 4.3, ruby + 1));
+        std::cout << v << std::endl;
+    }
+
+    {
+        char const ruby[] = "Ruby";
+        typedef vector<int, char, double, char const*> vector_type;
+        vector_type v(1, 'x', 3.3, ruby);
+        for_each(v, mutable_increment());
+        BOOST_TEST_EQ(v, vector_type(2, 'y', 4.3, ruby + 1));
         std::cout << v << std::endl;
     }
 

test/algorithm/segmented_for_each.cpp

@@ -1,14 +1,17 @@
 /*=============================================================================
     Copyright (c) 2001-2011 Joel de Guzman
     Copyright (c) 2011 Eric Niebler
+    Copyright (c) 2018 Kohei Takahashi
 
     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)
 ==============================================================================*/
-#include <boost/detail/lightweight_test.hpp>
+#include <boost/core/lightweight_test.hpp>
 #include <boost/fusion/container/vector/vector.hpp>
-#include <boost/fusion/algorithm/iteration/for_each.hpp>
 #include <boost/fusion/container/generation/make_vector.hpp>
+#include <boost/fusion/algorithm/iteration/for_each.hpp>
+#include <boost/fusion/sequence/comparison/equal_to.hpp>
+#include <boost/fusion/sequence/io/out.hpp>
 #include "../sequence/tree.hpp"
 
 struct print
@@ -20,6 +23,31 @@ struct print
     }
 };
 
+struct increment
+{
+    template <typename T>
+    void operator()(T& v) const
+    {
+        ++v;
+    }
+};
+
+struct mutable_increment : increment
+{
+    template <typename T>
+    void operator()(T& v)
+    {
+        return increment::operator()(v);
+    }
+};
+
+template <typename F, typename Tree>
+void test(Tree tree, Tree const& expected)
+{
+    boost::fusion::for_each(tree, F());
+    BOOST_TEST_EQ(tree, expected);
+}
+
 int
 main()
 {
@@ -42,6 +70,69 @@ main()
             )
           , print()
         );
+        std::cout << std::endl;
+    }
+
+    {
+        test<increment>(
+            make_tree(
+                make_vector(double(0),'B')
+              , make_tree(
+                    make_vector(1,2,long(3))
+                  , make_tree(make_vector('a','b','c'))
+                  , make_tree(make_vector(short('d'),'e','f'))
+                )
+              , make_tree(
+                    make_vector(4,5,6)
+                  , make_tree(make_vector(float(1),'h','i'))
+                  , make_tree(make_vector('j','k','l'))
+                )
+            )
+          , make_tree(
+                make_vector(double(1),'C')
+              , make_tree(
+                    make_vector(2,3,long(4))
+                  , make_tree(make_vector('b','c','d'))
+                  , make_tree(make_vector(short('e'),'f','g'))
+                )
+              , make_tree(
+                    make_vector(5,6,7)
+                  , make_tree(make_vector(float(2),'i','j'))
+                  , make_tree(make_vector('k','l','m'))
+                )
+            )
+        );
+    }
+
+    {
+        test<mutable_increment>(
+            make_tree(
+                make_vector(double(0),'B')
+              , make_tree(
+                    make_vector(1,2,long(3))
+                  , make_tree(make_vector('a','b','c'))
+                  , make_tree(make_vector(short('d'),'e','f'))
+                )
+              , make_tree(
+                    make_vector(4,5,6)
+                  , make_tree(make_vector(float(1),'h','i'))
+                  , make_tree(make_vector('j','k','l'))
+                )
+            )
+          , make_tree(
+                make_vector(double(1),'C')
+              , make_tree(
+                    make_vector(2,3,long(4))
+                  , make_tree(make_vector('b','c','d'))
+                  , make_tree(make_vector(short('e'),'f','g'))
+                )
+              , make_tree(
+                    make_vector(5,6,7)
+                  , make_tree(make_vector(float(2),'i','j'))
+                  , make_tree(make_vector('k','l','m'))
+                )
+            )
+        );
     }
 
     return boost::report_errors();

test/algorithm/ticket-5490.cpp

@@ -0,0 +1,41 @@
+/*=============================================================================
+    Copyright (c) 2018 Kohei Takahashi
+
+    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)
+==============================================================================*/
+#include <boost/fusion/include/vector.hpp>
+#include <boost/fusion/include/transform.hpp>
+#include <boost/mpl/quote.hpp>
+#include <boost/mpl/placeholders.hpp>
+#include <boost/core/ignore_unused.hpp>
+
+using namespace boost::fusion;
+
+template <typename>
+struct predicate {};
+
+struct unique {};
+
+template <typename>
+struct meta_func
+{
+    typedef unique result_type;
+
+    template <typename T>
+    unique operator()(const T&) const;
+};
+
+int main()
+{
+    vector<int> v;
+
+    typedef predicate<boost::mpl::_1> lambda_t;
+    typedef boost::mpl::quote1<predicate> quote_t;
+
+    vector<unique> l = transform(v, meta_func<lambda_t>());
+
+    vector<unique> q = transform(v, meta_func<quote_t>());
+
+    boost::ignore_unused(l, q);
+}

test/support/unused.cpp

@@ -19,7 +19,7 @@ void unused_construction()
 {
     boost::fusion::unused_type dephault;
 
-    boost::fusion::unused_type BOOST_ATTRIBUTE_UNUSED parenthesis();
+    boost::fusion::unused_type BOOST_ATTRIBUTE_UNUSED parenthesis = boost::fusion::unused_type();
 #ifndef BOOST_NO_CXX11_UNIFIED_INITIALIZATION_SYNTAX
     boost::fusion::unused_type BOOST_ATTRIBUTE_UNUSED brace{};
     boost::fusion::unused_type BOOST_ATTRIBUTE_UNUSED list_copy = {};