Make C++11 fusion::vector more consistent with C++03 fusion::vector

- Construct from elements is enabled iff each argument is_convertible to
    corresponding element.
  - Construct from sequence is enabled iff the single argument is a fusion
    sequence.
  - C++11 vector and tuple also disable construct from sequence that are
    shorter than the destination. C++03 gives incorrect is_convertible
    responses in this situation and fails to compile if that constructor is
    used; C++11 can have instantation errors in
    and_<is_convertible<U, T>...> without the additional check.
  - C++11 tuple and vector support truncation conversion and assignment like
    all other sequences.

include/boost/fusion/container/vector/detail/config.hpp

@@ -15,6 +15,7 @@
   || defined(BOOST_NO_CXX11_RVALUE_REFERENCES) \
   || defined(BOOST_NO_CXX11_TEMPLATE_ALIASES)  \
   || defined(BOOST_NO_CXX11_DECLTYPE)) \
+  || defined(BOOST_NO_CXX11_FUNCTION_TEMPLATE_DEFAULT_ARGS) \
   || defined(BOOST_FUSION_DISABLE_VARIADIC_VECTOR) \
   || (defined(__WAVE__) && defined(BOOST_FUSION_CREATE_PREPROCESSED_FILES))
 # if defined(BOOST_FUSION_HAS_VARIADIC_VECTOR)

include/boost/fusion/container/vector/vector.hpp

@@ -24,24 +24,21 @@
 ///////////////////////////////////////////////////////////////////////////////
 #include <boost/fusion/support/sequence_base.hpp>
 #include <boost/fusion/support/is_sequence.hpp>
-#include <boost/fusion/support/void.hpp>
+#include <boost/fusion/support/detail/and.hpp>
-#include <boost/fusion/support/detail/enabler.hpp>
 #include <boost/fusion/support/detail/index_sequence.hpp>
 #include <boost/fusion/container/vector/detail/at_impl.hpp>
 #include <boost/fusion/container/vector/detail/value_at_impl.hpp>
 #include <boost/fusion/container/vector/detail/begin_impl.hpp>
 #include <boost/fusion/container/vector/detail/end_impl.hpp>
-#include <boost/fusion/sequence/intrinsic/size.hpp>
 #include <boost/fusion/sequence/intrinsic/begin.hpp>
 #include <boost/fusion/sequence/intrinsic/size.hpp>
 #include <boost/fusion/iterator/advance.hpp>
 #include <boost/fusion/iterator/deref.hpp>
 #include <boost/core/enable_if.hpp>
-#include <boost/mpl/bool.hpp>
-#include <boost/mpl/equal_to.hpp>
 #include <boost/mpl/int.hpp>
-#include <boost/type_traits/is_same.hpp>
+#include <boost/type_traits/integral_constant.hpp>
-#include <boost/type_traits/remove_cv.hpp>
+#include <boost/type_traits/is_base_of.hpp>
+#include <boost/type_traits/is_convertible.hpp>
 #include <boost/type_traits/remove_reference.hpp>
 #include <cstddef>
 #include <utility>
@@ -54,56 +51,48 @@ namespace boost { namespace fusion
     namespace vector_detail
     {
         struct each_elem {};
-        struct copy_or_move {};
-        template <typename I> struct from_sequence {};
 
-        template <typename Sequence>
+        template <
-        struct make_indices_from_seq
+            typename This, typename T, typename T_, std::size_t Size, bool IsSeq
-            : detail::make_index_sequence<
+        >
-                  fusion::result_of::size<typename remove_reference<Sequence>::type>::value
+        struct can_convert_impl : false_type {};
+
+        template <typename This, typename T, typename Sequence, std::size_t Size>
+        struct can_convert_impl<This, T, Sequence, Size, true> : true_type {};
+
+        template <typename This, typename Sequence, typename T>
+        struct can_convert_impl<This, Sequence, T, 1, true>
+            : integral_constant<
+                  bool
+                , !is_convertible<
+                      Sequence
+                    , typename fusion::extension::value_at_impl<vector_tag>::
+                          template apply< This, mpl::int_<0> >::type
+                  >::value
               >
         {};
 
-        template <typename T>
+        template <typename This, typename T, typename T_, std::size_t Size>
-        struct pure : remove_cv<typename remove_reference<T>::type> {};
+        struct can_convert
-
+            : can_convert_impl<
-        template<typename Sequence, typename This, typename Enable = void>
+                  This, T, T_, Size, traits::is_sequence<T_>::value
-        struct can_convert : mpl::false_ {};
-
-        template<typename Sequence, typename This>
-        struct can_convert<
-            Sequence
-          , This
-          , typename enable_if<traits::is_sequence<Sequence>>::type
-        >   : mpl::equal_to<
-                  fusion::result_of::size<Sequence>
-                , fusion::result_of::size<This>
               >
-        {
+        {};
-        };
 
-        template <typename This, typename ...T>
+        template <typename T, bool IsSeq, std::size_t Size>
-        BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
+        struct is_longer_sequence_impl : false_type {};
-        inline each_elem
-        dispatch(T const&...) BOOST_NOEXCEPT { return each_elem(); }
 
-        template <typename This>
+        template <typename Sequence, std::size_t Size>
-        BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
+        struct is_longer_sequence_impl<Sequence, true, Size>
-        inline copy_or_move
+            : integral_constant<
-        dispatch(This const&) BOOST_NOEXCEPT { return copy_or_move(); }
+                  bool, (fusion::result_of::size<Sequence>::value >= Size)
-
+              >
-        template <typename This, typename Sequence>
+        {};
-        BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
-        inline from_sequence<
-            typename lazy_enable_if_c<
-                (!is_same<This, typename pure<Sequence>::type>::value &&
-                 can_convert<typename pure<Sequence>::type, This>::value)
-              , make_indices_from_seq<Sequence>
-            >::type
-        >
-        dispatch(Sequence&&) BOOST_NOEXCEPT
-        { return from_sequence<typename make_indices_from_seq<Sequence>::type>(); }
 
+        template<typename T, std::size_t Size>
+        struct is_longer_sequence
+            : is_longer_sequence_impl<T, traits::is_sequence<T>::value, Size>
+        {};
 
         // forward_at_c allows to access Nth element even if ForwardSequence
         // since fusion::at_c requires RandomAccessSequence.
@@ -168,22 +157,17 @@ namespace boost { namespace fusion
                 return *this;
             }
 
-            template <typename U>
+            template <
+                typename U
+              , typename = typename boost::disable_if<
+                    is_base_of<store, typename remove_reference<U>::type>
+                >::type
+            >
             BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
-            store(U&& rhs
+            store(U&& rhs)
-                , typename disable_if<is_same<typename pure<U>::type, store>, detail::enabler_>::type = detail::enabler)
                 : elem(std::forward<U>(rhs))
             {}
 
-            template <typename U>
-            BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
-            typename disable_if<is_same<typename pure<U>::type, store>, store&>::type
-            operator=(U&& rhs)
-            {
-                elem = std::forward<U>(rhs);
-                return *this;
-            }
-
             BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
             T      & get()       { return elem; }
             BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
@@ -211,21 +195,17 @@ namespace boost { namespace fusion
             vector_data()
             {}
 
-            BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
+            template <
-            vector_data(copy_or_move, vector_data const& rhs)
+                typename Sequence
-                : store<I, T>(static_cast<store<I, T> const&>(rhs))...
+              , typename Sequence_ = typename remove_reference<Sequence>::type
-            {}
+              , typename = typename boost::enable_if<
-
+                    can_convert<vector_data, Sequence, Sequence_, sizeof...(I)>
-            BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
+                >::type
-            vector_data(copy_or_move, vector_data&& rhs)
+            >
-                : store<I, T>(std::forward<store<I, T> >(rhs))...
-            {}
-
-            template <typename Sequence>
             BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
             explicit
-            vector_data(from_sequence<detail::index_sequence<I...> >, Sequence&& rhs)
+            vector_data(each_elem, Sequence&& rhs)
-                : store<I, T>(forward_at_c<I>(rhs))...
+                : store<I, T>(forward_at_c<I>(std::forward<Sequence>(rhs)))...
             {}
 
             template <typename ...U>
@@ -235,6 +215,14 @@ namespace boost { namespace fusion
                 : store<I, T>(std::forward<U>(var))...
             {}
 
+            template <typename Sequence>
+            BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
+            void
+            assign_sequence(Sequence&& seq)
+            {
+                assign(std::forward<Sequence>(seq), detail::index_sequence<I...>());
+            }
+
             template <typename Sequence>
             BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
             void
@@ -299,15 +287,36 @@ namespace boost { namespace fusion
         vector()
         {}
 
-        // rvalue-references is required here in order to forward any arguments to
+        template <
-        // base: vector(T const&...) doesn't work with trailing void_ and
+            typename... U
-        // vector(U const&...) cannot forward any arguments to base.
+          , typename = typename boost::enable_if_c<(
-        template <typename... U>
+                sizeof...(U) >= 1 &&
+                fusion::detail::and_<is_convertible<U, T>...>::value &&
+                !fusion::detail::and_<
+                    is_base_of<vector, typename remove_reference<U>::type>...
+                >::value
+            )>::type
+        >
         // XXX: constexpr become error due to pull-request #79, booooo!!
         //      In the (near) future release, should be fixed.
         /* BOOST_CONSTEXPR */ BOOST_FUSION_GPU_ENABLED
-        vector(U&&... u)
+        explicit vector(U&&... u)
-            : base(vector_detail::dispatch<vector>(std::forward<U>(u)...), std::forward<U>(u)...)
+            : base(vector_detail::each_elem(), std::forward<U>(u)...)
+        {}
+
+        template <
+            typename Sequence
+          , typename Sequence_ = typename remove_reference<Sequence>::type
+          , typename = typename boost::enable_if_c<(
+                !is_base_of<vector, Sequence_>::value &&
+                vector_detail::is_longer_sequence<
+                    Sequence_, sizeof...(T)
+                >::value
+            )>::type
+        >
+        BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
+        vector(Sequence&& seq)
+            : base(vector_detail::each_elem(), std::forward<Sequence>(seq))
         {}
 
         template <typename Sequence>
@@ -315,10 +324,7 @@ namespace boost { namespace fusion
         vector&
         operator=(Sequence&& rhs)
         {
-            typedef typename
+            base::assign_sequence(std::forward<Sequence>(rhs));
-                vector_detail::make_indices_from_seq<Sequence>::type
-            indices;
-            base::assign(std::forward<Sequence>(rhs), indices());
             return *this;
         }
     };

include/boost/fusion/tuple/tuple.hpp

@@ -42,12 +42,22 @@ namespace boost { namespace fusion
         tuple()
             : base_type() {}
 
-        template <typename ...U>
+        template <
+            typename ...U
+          , typename = typename boost::enable_if_c<
+                sizeof...(U) >= sizeof...(T)
+            >::type
+        >
         BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
         tuple(tuple<U...> const& other)
             : base_type(other) {}
 
-        template <typename ...U>
+        template <
+            typename ...U
+          , typename = typename boost::enable_if_c<
+                sizeof...(U) >= sizeof...(T)
+            >::type
+        >
         BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
         tuple(tuple<U...>&& other)
             : base_type(std::move(other)) {}

include/boost/fusion/tuple/tuple_fwd.hpp

@@ -12,7 +12,6 @@
 #include <boost/fusion/container/vector/detail/config.hpp>
 
 #if  !defined(BOOST_FUSION_HAS_VARIADIC_VECTOR) \
-  || defined(BOOST_NO_CXX11_FUNCTION_TEMPLATE_DEFAULT_ARGS) \
   || (defined(__WAVE__) && defined(BOOST_FUSION_CREATE_PREPROCESSED_FILES))
 # if defined(BOOST_FUSION_HAS_VARIADIC_TUPLE)
 #   undef BOOST_FUSION_HAS_VARIADIC_TUPLE

test/Jamfile

@@ -123,6 +123,7 @@ project
     [ run sequence/array.cpp :  :  :  : ]
     [ run sequence/tuple_comparison.cpp :  :  :  : ]
     [ run sequence/tuple_construction.cpp :  :  :  : ]
+    [ run sequence/tuple_conversion.cpp :  :  :  : ]
     [ run sequence/tuple_copy.cpp :  :  :  : ]
     [ run sequence/tuple_element.cpp :  :  :  : ]
     [ run sequence/tuple_make.cpp :  :  :  : ]
@@ -136,18 +137,19 @@ project
       :
       :
       :
-      : sequence/tuple_traits/maybe_variadic_vector
+      : sequence/tuple_traits/maybe_variadic_tuple
     ]
     [
         run sequence/tuple_traits.cpp
       :
       :
       : <define>BOOST_FUSION_DISABLE_VARIADIC_VECTOR
-      : sequence/tuple_traits/no_variadic_vector
+      : sequence/tuple_traits/no_variadic_tuple
     ]
     [ run sequence/transform_view.cpp :  :  :  : ]
     [ run sequence/vector_comparison.cpp :  :  :  : ]
     [ run sequence/vector_construction.cpp :  :  :  : ]
+    [ run sequence/vector_conversion.cpp : : : : ]
     [ run sequence/vector_copy.cpp :  :  :  : ]
     [ run sequence/vector_iterator.cpp :  :  :  : ]
     [ run sequence/vector_make.cpp :  :  :  : ]
@@ -158,6 +160,20 @@ project
     [ run sequence/vector_nest.cpp :  :  :  : ]
     [ run sequence/vector_hash.cpp :  :  :  : ]
     [ run sequence/vector_tie.cpp :  :  :  : ]
+    [
+        run sequence/vector_traits.cpp
+      :
+      :
+      :
+      : sequence/vector_traits/maybe_variadic_vector
+    ]
+    [
+        run sequence/vector_traits.cpp
+      :
+      :
+      : <define>BOOST_FUSION_DISABLE_VARIADIC_VECTOR
+      : sequence/vector_traits/no_variadic_vector
+    ]
     [ run sequence/vector_value_at.cpp :  :  :  : ]
     [ run sequence/zip_view.cpp : : : : ]
     [ run sequence/zip_view2.cpp : : : : ]

test/sequence/conversion.hpp

@@ -0,0 +1,320 @@
+/*=============================================================================
+    Copyright (c) 2016 Lee Clagett
+
+    Use modification and distribution are subject to the Boost Software
+    License, Version 1.0. (See accompanyintg file LICENSE_1_0.txt or copy at
+    http://www.boost.org/LICENSE_1_0.txt).
+==============================================================================*/
+
+#include <boost/config.hpp>
+#include <boost/detail/lightweight_test.hpp>
+#include <boost/fusion/adapted/boost_tuple.hpp>
+#include <boost/fusion/adapted/std_pair.hpp>
+#if !defined(BOOST_NO_CXX11_HDR_TUPLE)
+# include <boost/fusion/adapted/std_tuple.hpp>
+#endif
+#include <boost/fusion/container/deque.hpp>
+#include <boost/fusion/container/list.hpp>
+#include <boost/fusion/tuple.hpp>
+#include <boost/fusion/container/vector.hpp>
+
+#include "fixture.hpp"
+
+template <template <typename> class Scenario>
+void test()
+{
+    using namespace test_detail;
+
+    // Note the trunction conversion tests from each containter
+    // ... bug or feature?
+
+    BOOST_TEST((
+        run< Scenario< FUSION_SEQUENCE<convertible, int> > >(
+            boost::fusion::push_back(FUSION_SEQUENCE<int>(300), 400)
+        )
+    ));
+    BOOST_TEST((
+        run< Scenario< FUSION_SEQUENCE<convertible> > >(
+            boost::fusion::push_back(FUSION_SEQUENCE<int>(200), 400)
+          , FUSION_SEQUENCE<convertible>(200)
+        )
+    ));
+
+    BOOST_TEST((run<Scenario<FUSION_SEQUENCE<> > >(boost::fusion::vector<>())));
+    BOOST_TEST((
+        run< Scenario< FUSION_SEQUENCE<> > >(
+            boost::fusion::vector<int>(100), boost::fusion::vector<>()
+        )
+    ));
+    BOOST_TEST((
+        run< Scenario< FUSION_SEQUENCE<convertible> > >(
+            boost::fusion::vector<int>(110)
+        )
+    ));
+    BOOST_TEST((
+        run< Scenario< FUSION_SEQUENCE<convertible> > >(
+            boost::fusion::vector<int, int>(200, 100)
+          , boost::fusion::vector<convertible>(200)
+        )
+    ));
+    BOOST_TEST((
+        run< Scenario< FUSION_SEQUENCE<convertible, int> > >(
+            boost::fusion::vector<int, int>(200, 400)
+        )
+    ));
+    BOOST_TEST((
+        run< Scenario< FUSION_SEQUENCE<convertible, int> > >(
+            boost::fusion::vector<int, int, int>(500, 400, 100)
+          , boost::fusion::vector<convertible, int>(500, 400)
+        )
+    ));
+    BOOST_TEST((
+        run< Scenario< FUSION_SEQUENCE<convertible, int> > >(
+            boost::fusion::push_back(
+                boost::fusion::vector<int>(500), 400
+            )
+        )
+    ));
+    BOOST_TEST((
+        run< Scenario< FUSION_SEQUENCE<convertible, int> > >(
+            boost::fusion::push_back(
+                boost::fusion::vector<int, int>(500, 400), 100
+            )
+          , boost::fusion::vector<convertible, int>(500, 400)
+        )
+    ));
+
+    BOOST_TEST((run<Scenario< FUSION_SEQUENCE<> > >(boost::fusion::deque<>())));
+    BOOST_TEST((
+        run< Scenario< FUSION_SEQUENCE<> > >(
+            boost::fusion::deque<int>(100), boost::fusion::deque<>()
+        )
+    ));
+    BOOST_TEST((
+        run< Scenario< FUSION_SEQUENCE<convertible> > >(
+            boost::fusion::deque<int>(500)
+        )
+    ));
+    BOOST_TEST((
+        run< Scenario< FUSION_SEQUENCE<convertible> > >(
+            boost::fusion::deque<int, int>(500, 100)
+          , boost::fusion::deque<convertible>(500)
+        )
+    ));
+    BOOST_TEST((
+        run< Scenario< FUSION_SEQUENCE<convertible, int> > >(
+            boost::fusion::deque<int, int>(500, 400)
+        )
+    ));
+    BOOST_TEST((
+        run< Scenario< FUSION_SEQUENCE<convertible, int> > >(
+            boost::fusion::deque<int, int, int>(500, 400, 100)
+          , boost::fusion::deque<convertible, int>(500, 400)
+        )
+    ));
+    BOOST_TEST((
+        run< Scenario< FUSION_SEQUENCE<convertible, int> > >(
+            boost::fusion::push_back(
+                boost::fusion::deque<int>(500), 400
+            )
+        )
+    ));
+    BOOST_TEST((
+        run< Scenario< FUSION_SEQUENCE<convertible, int> > >(
+            boost::fusion::push_back(
+                boost::fusion::deque<int, int>(500, 400), 100
+            )
+          , boost::fusion::deque<convertible, int>(500, 400)
+        )
+    ));
+
+    BOOST_TEST((run< Scenario< FUSION_SEQUENCE<> > >(boost::fusion::list<>())));
+    BOOST_TEST((
+        run< Scenario< FUSION_SEQUENCE<> > >(
+            boost::fusion::list<int>(100), boost::fusion::list<>()
+        )
+    ));
+    BOOST_TEST((
+        run< Scenario< FUSION_SEQUENCE<convertible> > >(
+            boost::fusion::list<int>(500)
+        )
+    ));
+    BOOST_TEST((
+        run< Scenario< FUSION_SEQUENCE<convertible> > >(
+            boost::fusion::list<int, int>(500, 100)
+          , boost::fusion::list<convertible>(500)
+        )
+    ));
+    BOOST_TEST((
+        run< Scenario< FUSION_SEQUENCE<convertible, int> > >(
+            boost::fusion::list<int, int>(500, 400)
+        )
+    ));
+    BOOST_TEST((
+        run< Scenario< FUSION_SEQUENCE<convertible, int> > >(
+            boost::fusion::list<int, int, int>(500, 400, 100)
+          , boost::fusion::list<convertible, int>(500, 400)
+        )
+    ));
+    BOOST_TEST((
+        run< Scenario< FUSION_SEQUENCE<convertible, int> > >(
+            boost::fusion::push_back(
+                boost::fusion::list<int>(500), 400
+            )
+        )
+    ));
+    BOOST_TEST((
+        run< Scenario< FUSION_SEQUENCE<convertible, int> > >(
+            boost::fusion::push_back(
+                boost::fusion::list<int, int>(500, 400), 100
+            )
+          , boost::fusion::list<convertible, int>(500, 400)
+        )
+    ));
+
+    BOOST_TEST((run<Scenario< FUSION_SEQUENCE<> > >(boost::fusion::tuple<>())));
+    BOOST_TEST((
+        run< Scenario< FUSION_SEQUENCE<> > >(
+            boost::fusion::tuple<int>(100), boost::fusion::tuple<>()
+        )
+    ));
+    BOOST_TEST((
+        run< Scenario< FUSION_SEQUENCE<convertible> > >(
+            boost::fusion::tuple<int>(500)
+        )
+    ));
+    BOOST_TEST((
+        run< Scenario< FUSION_SEQUENCE<convertible> > >(
+            boost::fusion::tuple<int, int>(500, 100)
+          , boost::fusion::tuple<convertible>(500)
+        )
+    ));
+    BOOST_TEST((
+        run< Scenario< FUSION_SEQUENCE<convertible, int> > >(
+            boost::fusion::tuple<int, int>(500, 400)
+        )
+    ));
+    BOOST_TEST((
+        run< Scenario< FUSION_SEQUENCE<convertible, int> > >(
+            boost::fusion::tuple<int, int, int>(500, 400, 100)
+          , boost::fusion::tuple<convertible, int>(500, 400)
+        )
+    ));
+    BOOST_TEST((
+        run< Scenario< FUSION_SEQUENCE<convertible, int> > >(
+            boost::fusion::push_back(
+                boost::fusion::tuple<int>(500), 400
+            )
+        )
+    ));
+    BOOST_TEST((
+        run< Scenario< FUSION_SEQUENCE<convertible, int> > >(
+            boost::fusion::push_back(
+                boost::fusion::tuple<int, int>(500, 400), 100
+            )
+          , boost::fusion::tuple<convertible, int>(500, 400)
+        )
+    ));
+
+    BOOST_TEST((run< Scenario< FUSION_SEQUENCE<> > >(boost::tuple<>())));
+    BOOST_TEST((
+        run< Scenario< FUSION_SEQUENCE<> > >(
+            boost::tuple<int>(100), boost::tuple<>()
+        )
+    ));
+    BOOST_TEST((
+        run< Scenario< FUSION_SEQUENCE<convertible> > >(
+            boost::tuple<int>(500)
+        )
+    ));
+    BOOST_TEST((
+        run< Scenario< FUSION_SEQUENCE<convertible> > >(
+            boost::tuple<int, int>(500, 100)
+          , boost::tuple<convertible>(500)
+        )
+    ));
+    BOOST_TEST((
+        run< Scenario< FUSION_SEQUENCE<convertible, int> > >(
+            boost::tuple<int, int>(500, 400)
+        )
+    ));
+    BOOST_TEST((
+        run< Scenario< FUSION_SEQUENCE<convertible, int> > >(
+            boost::tuple<int, int, int>(500, 400, 100)
+          , boost::tuple<convertible, int>(500, 400)
+        )
+    ));
+    BOOST_TEST((
+        run< Scenario< FUSION_SEQUENCE<convertible, int> > >(
+            boost::fusion::push_back(boost::tuple<int>(500), 400)
+        )
+    ));
+    BOOST_TEST((
+        run< Scenario< FUSION_SEQUENCE<convertible, int> > >(
+            boost::fusion::push_back(
+                boost::tuple<int, int>(500, 400), 100
+            )
+          , boost::tuple<convertible, int>(500, 400)
+        )
+    ));
+    
+#if !defined(BOOST_NO_CXX11_HDR_TUPLE)
+    BOOST_TEST((run< Scenario< FUSION_SEQUENCE<> > >(std::tuple<>())));
+    BOOST_TEST((
+        run<Scenario<FUSION_SEQUENCE<> > >(std::tuple<int>(100), std::tuple<>())
+    ));
+    BOOST_TEST((
+        run< Scenario< FUSION_SEQUENCE<convertible> > >(
+            std::tuple<int>(500)
+        )
+    ));
+    BOOST_TEST((
+        run< Scenario< FUSION_SEQUENCE<convertible> > >(
+            std::tuple<int, int>(500, 100)
+          , std::tuple<convertible>(500)
+        )
+    ));
+    BOOST_TEST((
+        run< Scenario< FUSION_SEQUENCE<convertible, int> > >(
+            std::tuple<int, int>(500, 400)
+        )
+    ));
+    BOOST_TEST((
+        run< Scenario< FUSION_SEQUENCE<convertible, int> > >(
+            std::tuple<int, int, int>(500, 400, 100)
+          , std::tuple<convertible, int>(500, 400)
+        )
+    ));
+    BOOST_TEST((
+        run< Scenario< FUSION_SEQUENCE<convertible, int> > >(
+            boost::fusion::push_back(std::tuple<int>(500), 400)
+        )
+    ));
+    BOOST_TEST((
+        run< Scenario< FUSION_SEQUENCE<convertible, int> > >(
+            boost::fusion::push_back(
+                std::tuple<int, int>(500, 400), 100
+            )
+          , std::tuple<convertible, int>(500, 400)
+        )
+    ));
+#endif
+
+    BOOST_TEST((
+        run< Scenario< FUSION_SEQUENCE<convertible, int> > >(
+            std::pair<int, int>(500, 400)
+        )
+    ));
+    BOOST_TEST((
+        run< Scenario< FUSION_SEQUENCE<> > >(
+            std::pair<int, int>(500, 400)
+          , boost::fusion::vector<>()
+        )
+    ));
+    BOOST_TEST((
+        run< Scenario< FUSION_SEQUENCE<convertible> > >(
+            std::pair<int, int>(500, 400)
+          , boost::fusion::vector<convertible>(500)
+        )
+    ));
+}

test/sequence/copy.hpp

@@ -5,6 +5,8 @@
     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 <string>
+
 #include <boost/detail/lightweight_test.hpp>
 #include <boost/fusion/sequence/intrinsic/at.hpp>
 #include <boost/fusion/mpl.hpp>
@@ -15,6 +17,8 @@
 #include <boost/mpl/equal.hpp>
 #include <boost/static_assert.hpp>
 
+#include "fixture.hpp"
+
 #if !defined(FUSION_AT)
 #define FUSION_AT at_c
 #endif
@@ -36,12 +40,6 @@ namespace test_detail
     struct DD { operator CC() const { return CC(); }; };
 }
 
-boost::fusion::FUSION_SEQUENCE<double, double, double, double>
-foo(int i)
-{
-   return boost::fusion::FUSION_MAKE(i, i+1, i+2, i+3);
-}
-
 void test_mpl()
 {
     using namespace boost::fusion;
@@ -60,6 +58,7 @@ void test_mpl()
     BOOST_STATIC_ASSERT(equal::value);
 }
 
+template <template <typename> class Scenario>
 void
 test()
 {
@@ -77,6 +76,9 @@ test()
     BOOST_TEST((double)FUSION_AT<0>(t1) == FUSION_AT<0>(t3));
     BOOST_TEST(FUSION_AT<1>(t1) == FUSION_AT<1>(t3)[0]);
 
+    BOOST_TEST(FUSION_AT<0>(t1) == 4);
+    BOOST_TEST(FUSION_AT<1>(t1) == 'a');
+
     // testing copy and assignment with implicit conversions
     // between elements testing tie
 
@@ -91,8 +93,62 @@ test()
     BOOST_TEST(c=='a');
     BOOST_TEST(d>5.4 && d<5.6);
 
-    // returning a tuple with conversion
-    foo(2);
-
     test_mpl();
+
+
+    BOOST_TEST((run< Scenario< FUSION_SEQUENCE<> > >(FUSION_SEQUENCE<>())));
+
+    BOOST_TEST((
+        run< Scenario< FUSION_SEQUENCE<int> > >(FUSION_SEQUENCE<int>(500))
+    ));
+    BOOST_TEST((
+        run< Scenario< FUSION_SEQUENCE<convertible> > >(
+            FUSION_SEQUENCE<int>(500)
+        )
+    ));
+    BOOST_TEST((
+        run< Scenario< FUSION_SEQUENCE<int> > >(
+            FUSION_SEQUENCE<int, int>(500, 100)
+          , FUSION_SEQUENCE<int>(500)
+        )
+    ));
+    BOOST_TEST((
+        run< Scenario< FUSION_SEQUENCE<convertible> > >(
+            FUSION_SEQUENCE<int, int>(500, 100)
+          , FUSION_SEQUENCE<convertible>(500)
+        )
+    ));
+
+    BOOST_TEST((
+        run< Scenario< FUSION_SEQUENCE<int, int> > >(
+            FUSION_SEQUENCE<int, int>(500, 600)
+        )
+    ));
+    BOOST_TEST((
+        run< Scenario< FUSION_SEQUENCE<convertible, int> > >(
+            FUSION_SEQUENCE<convertible, int>(100, 500)
+        )
+    ));
+    BOOST_TEST((
+        run< Scenario< FUSION_SEQUENCE<int, convertible> > >(
+            FUSION_SEQUENCE<int, convertible>(500, 600)
+        )
+    ));
+    BOOST_TEST((
+        run< Scenario< FUSION_SEQUENCE<convertible, convertible> > >(
+            FUSION_SEQUENCE<int, int>(400, 500)
+        )
+    ));
+    BOOST_TEST((
+        run< Scenario< FUSION_SEQUENCE<int, int> > >(
+            FUSION_SEQUENCE<int, int, int>(500, 100, 323)
+          , FUSION_SEQUENCE<int, int>(500, 100)
+        )
+    ));
+    BOOST_TEST((
+        run< Scenario< FUSION_SEQUENCE<convertible, convertible> > >(
+            FUSION_SEQUENCE<int, int, int>(500, 600, 100)
+          , FUSION_SEQUENCE<convertible, convertible>(500, 600)
+        )
+    ));
 }

test/sequence/deque_copy.cpp

@@ -13,10 +13,30 @@
 #define FUSION_SEQUENCE deque
 #include "copy.hpp"
 
+using namespace test_detail;
+
+// c++11 deque has bug, cannot properly copy-assign from a const value
+template <typename T>
+struct skip_const_lvalue_assignment
+{
+    template <typename Source, typename Expected>
+    bool operator()(Source const& source, Expected const& expected) const
+    {
+        return
+            run< can_implicit_construct<T> >(source, expected) &&
+            run< can_construct<T> >(source, expected) &&
+            run< can_rvalue_assign<T> >(source, expected) &&
+            run< can_lvalue_assign<T> >(source, expected);
+    }
+};
+
 int
 main()
 {
-    test();
+#if defined(BOOST_FUSION_HAS_VARIADIC_DEQUE)
+    test<skip_const_lvalue_assignment>();
+#else
+    test<can_copy>();
+#endif
     return boost::report_errors();
 }
-

test/sequence/deque_nest.cpp

@@ -7,13 +7,37 @@
 #include <boost/fusion/container/deque/deque.hpp>
 #include <boost/core/lightweight_test.hpp>
 
-#define FUSION_SEQUENCE deque
+#define FUSION_SEQUENCE boost::fusion::deque
 #include "nest.hpp"
 
+/* deque has a few issues:
+    - sequence conversion constructor is explicit
+    - assignment sequence conversion has bug in base class
+    - c++11 direct assignment from lvalue has bug */
+template <typename T>
+struct skip_issues
+{
+    template <typename Source, typename Expected>
+    bool operator()(Source const& source, Expected const& expected) const
+    {
+        using namespace test_detail;
+        return
+#if defined(BOOST_FUSION_HAS_VARIADIC_DEQUE)
+            run< can_construct<T> >(source, expected) &&
+            run< can_implicit_construct<T> >(source, expected) &&
+            run< can_rvalue_assign<T> >(source, expected) &&
+            run< can_convert_using<can_construct>::to<T> >(source, expected) &&
+#else
+            run< can_copy<T> >(source, expected) &&
+#endif
+            run< can_construct_from_elements<T> >(source, expected);
+    }
+};
+
 int
 main()
 {
-    test();
+    test<skip_issues>();
     return boost::report_errors();
 }
 

test/sequence/fixture.hpp

@@ -0,0 +1,216 @@
+/*=============================================================================
+    Copyright (c) 2016 Lee Clagett
+
+    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/sequence/comparison.hpp>
+#include <boost/mpl/identity.hpp>
+
+namespace test_detail
+{
+    struct convertible
+    {
+        convertible() : value_() {}
+        convertible(int value) : value_(value) {}
+        int value_;
+    };
+
+    bool operator==(convertible const& lhs, convertible const& rhs)
+    {
+        return lhs.value_ == rhs.value_;
+    }
+
+    bool operator!=(convertible const& lhs, convertible const& rhs)
+    {
+        return lhs.value_ != rhs.value_;
+    }
+
+    // Testing conversion at function call allows for testing mutable lvalue,
+    // const lvalue, and rvalue as the source. mpl::identity prevents deduction
+    template <typename T>
+    T implicit_construct(typename boost::mpl::identity<T>::type source)
+    {
+        return source;
+    }
+
+    template <typename F, typename Source, typename Expected>
+    bool run(Source const& source, Expected const& expected)
+    {
+        return F()(source, expected);
+    }
+
+    template <typename F, typename Source>
+    bool run(Source const& source)
+    {
+        return run<F>(source, source);
+    }
+
+    template <typename T>
+    struct can_rvalue_implicit_construct
+    {
+        template<typename Source, typename Expected>
+        bool operator()(Source const& source, Expected const& expected) const
+        {
+            return expected == implicit_construct<T>(implicit_construct<Source>(source));
+        }
+    };
+
+    template <typename T>
+    struct can_lvalue_implicit_construct    
+    {
+        template <typename Source, typename Expected>
+        bool operator()(Source source, Expected const& expected) const
+        {
+            return expected == implicit_construct<T>(source);
+        }
+    };
+
+    template <typename T>
+    struct can_const_lvalue_implicit_construct
+    {
+        template <typename Source, typename Expected>
+        bool operator()(Source const& source, Expected const& expected) const
+        {
+            return expected == implicit_construct<T>(source);
+        }
+    };
+
+    template <typename T>
+    struct can_implicit_construct
+    {
+        template <typename Source, typename Expected>
+        bool operator()(Source const& source, Expected const& expected) const
+        {
+            return
+                run< can_rvalue_implicit_construct<T> >(source, expected) &&
+                run< can_lvalue_implicit_construct<T> >(source, expected) &&
+                run< can_const_lvalue_implicit_construct<T> >(source, expected);
+        }
+    };
+
+    template <typename T>
+    struct can_rvalue_construct
+    {
+        template<typename Source, typename Expected>
+        bool operator()(Source const& source, Expected const& expected) const
+        {
+            return expected == T(implicit_construct<Source>(source));
+        }
+    };
+
+    template <typename T>
+    struct can_lvalue_construct    
+    {
+        template <typename Source, typename Expected>
+        bool operator()(Source source, Expected const& expected) const
+        {
+            return expected == T(source);
+        }
+    };
+
+    template <typename T>
+    struct can_const_lvalue_construct
+    {
+        template <typename Source, typename Expected>
+        bool operator()(Source const& source, Expected const& expected) const
+        {
+            return expected == T(source);
+        }
+    };
+
+    template <typename T>
+    struct can_construct
+    {
+        template <typename Source, typename Expected>
+        bool operator()(Source const& source, Expected const& expected) const
+        {
+            return
+                run< can_rvalue_construct<T> >(source, expected) &&
+                run< can_lvalue_construct<T> >(source, expected) &&
+                run< can_const_lvalue_construct<T> >(source, expected);
+        }
+    };
+
+    template <typename T>
+    struct can_rvalue_assign
+    {
+        template <typename Source, typename Expected>
+        bool operator()(Source const& source, Expected const& expected) const
+        {
+            bool result = true;
+            {
+                T seq;
+                result &= (seq == expected || seq != expected);
+
+                seq = implicit_construct<Source>(source);
+                result &= (seq == expected);
+            }
+            return result;
+        }
+    };
+
+    template <typename T>    
+    struct can_lvalue_assign
+    {
+
+        template <typename Source, typename Expected>
+        bool operator()(Source source, Expected const& expected) const
+        {
+            bool result = true;
+            {
+                T seq;
+                result &= (seq == expected || seq != expected);
+
+                seq = source;
+                result &= (seq == expected);
+            }
+            return result;
+        }
+    };
+
+    template <typename T>
+    struct can_const_lvalue_assign
+    {
+        template <typename Source, typename Expected>
+        bool operator()(Source const& source, Expected const& expected) const
+        {
+            bool result = true;
+            {
+                T seq;
+                result &= (seq == expected || seq != expected);
+
+                seq = source;
+                result &= (seq == expected);
+            }
+            return result;
+        }
+    };
+    
+    template <typename T>
+    struct can_assign
+    {
+        template <typename Source, typename Expected>
+        bool operator()(Source const& source, Expected const& expected) const
+        {
+            return 
+                run< can_rvalue_assign<T> >(source, expected) &&
+                run< can_lvalue_assign<T> >(source, expected) &&
+                run< can_const_lvalue_assign<T> >(source, expected);
+        }
+    };
+
+    template <typename T>
+    struct can_copy
+    {
+        template <typename Source, typename Expected>
+        bool operator()(Source const& source, Expected const& expected) const
+        {
+            return
+                run< can_construct<T> >(source, expected) &&
+                run< can_implicit_construct<T> >(source, expected) &&
+                run< can_assign<T> >(source, expected);
+        }
+    }; 
+} // test_detail

test/sequence/list_copy.cpp

@@ -15,7 +15,7 @@
 int
 main()
 {
-    test();
+    test<test_detail::can_copy>();
     return boost::report_errors();
 }
 

test/sequence/list_nest.cpp

@@ -7,13 +7,30 @@
 #include <boost/fusion/container/list/list.hpp>
 #include <boost/core/lightweight_test.hpp>
 
-#define FUSION_SEQUENCE list
+#define FUSION_SEQUENCE boost::fusion::list
 #include "nest.hpp"
 
+/* list has a few issues:
+    - sequence conversion constructor has bug when first element is a sequence
+    - assignment sequence conversion has bug in base class */
+template <typename T>
+struct skip_issues
+{
+    template <typename Source, typename Expected>
+    bool operator()(Source const& source, Expected const& expected) const
+    {
+        using namespace test_detail;
+        return
+            run< can_copy<T> >(source, expected) &&
+            run< can_construct_from_elements<T> >(source, expected);
+    }
+};
+
+
 int
 main()
 {
-    test();
+    test<skip_issues>();
     return boost::report_errors();
 }
 

test/sequence/nest.hpp

@@ -7,111 +7,315 @@
 
 #include <utility>
 #include <boost/config.hpp>
+#include <boost/fusion/include/adapt_struct.hpp>
 #include <boost/fusion/include/as_deque.hpp>
 #include <boost/fusion/include/as_list.hpp>
 #include <boost/fusion/include/as_vector.hpp>
+#include <boost/fusion/include/begin.hpp>
+#include <boost/fusion/include/is_sequence.hpp>
+#include <boost/fusion/include/size.hpp>
+#include <boost/fusion/include/value_of.hpp>
+#include <boost/type_traits/integral_constant.hpp>
+#include <boost/type_traits/remove_const.hpp>
+#include <boost/type_traits/remove_reference.hpp>
 
-template<typename C, template<typename> class As>
+#include "fixture.hpp"
-void test_from_sequence_rvalue()
+
+namespace test_detail
 {
-    typename As<C>::type dst((C()));
+    struct adapted_sequence
-    (void)dst;
+    {
-}
+        adapted_sequence() : value_() {}
+        explicit adapted_sequence(int value) : value_(value) {}
+        int value_;
+    };
 
-template<typename C, template<typename> class As>
+    bool operator==(adapted_sequence const& lhs, adapted_sequence const& rhs)
-void test_from_sequence_const_lvalue()
+    {
-{
+        return lhs.value_ == rhs.value_;
-    C src;
+    }
-    typename As<C>::type dst(src);
-    (void)dst;
-}
 
-template<typename C, template<typename> class As>
+    bool operator!=(adapted_sequence const& lhs, adapted_sequence const& rhs)
-void test_from_sequence_lvalue()
+    {
-{
+        return lhs.value_ != rhs.value_;
-    const C src;
+    }
-    typename As<C>::type dst(src);
-    (void)dst;
-}
 
-template<typename C, template<typename> class As>
+    template <template <typename> class Scenario>
-void test_from_sequence()
+    struct can_convert_using
-{
+    {
-// the following tests do not work in all cases for C++03
+        template <typename T>
-#if defined(BOOST_FUSION_HAS_VARIADIC_VECTOR)
+        struct to
-    test_from_sequence_rvalue<C, As>();
+        {
-    test_from_sequence_const_lvalue<C, As>();
+            static bool can_convert_(boost::true_type /* skip */)
-    test_from_sequence_lvalue<C, As>();
+            {
-#endif
+                return true;
-}
+            }
 
-template <typename C>
+            static bool can_convert_(boost::false_type /* skip */)
-void test_copy()
+            {
-{
+                using namespace boost::fusion;
-    C src;
+                return
-    C dst = src;
+                    run<Scenario<T> >(typename result_of::as_deque<T>::type()) &&
-    (void)dst;
+                    run<Scenario<T> >(typename result_of::as_list<T>::type()) &&
-}
+                    run<Scenario<T> >(typename result_of::as_vector<T>::type());
+            }
 
-#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
+            template <typename Source, typename Expected>
-template <typename C>
+            bool operator()(Source const&, Expected const&) const
-void test_move()
+            {
-{
+                // bug when converting single element sequences in C++03 and
-    C src;
+                // C++11... 
-    C dst = std::move(src);
+                // not_<not_<is_convertible<sequence<sequence<int>>, int >
-    (void)dst;
+                // is invalid check
-}
+                typedef typename ::boost::fusion::result_of::size<T>::type seq_size;
-#endif
+                return can_convert_(
+                    boost::integral_constant<bool, seq_size::value == 1>()
+                );
+            }
+        };
+    };
 
-template <typename C>
+    template <typename T>
-void test_all()
+    struct can_construct_from_elements
-{
+    {
-// as_deque and as_list do not work in C++03 or C++11 mode
+        template <typename Source, typename Expected>
-//    test_from_sequence<C, boost::fusion::result_of::as_deque>();
+        bool operator()(Source const&, Expected const&) const
-//    test_from_sequence<C, boost::fusion::result_of::as_list>();
+        {
-    test_from_sequence<C, boost::fusion::result_of::as_vector>();
+            // constructing a nested sequence of one is the complicated case to
-    test_copy<C>();
+            // disambiguate from a conversion-copy, so focus on that
-#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
+            typedef typename boost::fusion::result_of::size<T>::type seq_size;
-    test_move<C>();
+            return can_construct_(
-#endif
+                boost::integral_constant<int, seq_size::value>()
-}
+            );
+        }
 
+        template <int Size>
+        static bool can_construct_(boost::integral_constant<int, Size>)
+        {
+            return Size == 0 || Size == 2 || Size == 3;
+        }
+
+        static bool can_construct_(boost::integral_constant<int, 1>)
+        {
+            typedef typename ::boost::remove_reference<
+                typename ::boost::remove_const<
+                    typename ::boost::fusion::result_of::value_of<
+                        typename ::boost::fusion::result_of::begin<T>::type
+                    >::type
+                >::type
+            >::type element;
+
+            return run< can_construct<T> >(element(), T());
+        }
+    };
+
+    template <typename T>
+    struct can_nest
+    {
+        template <typename Source, typename Expected>
+        bool operator()(Source const& source, Expected const& expected)
+        {
+            return
+                run< can_copy<T> >(source, expected);
+                run< can_convert_using<can_copy>::to<T> >(source, expected) &&
+                run< can_construct_from_elements<T> >(source, expected);
+        }
+    };
+} // test_detail
+
+
+BOOST_FUSION_ADAPT_STRUCT(test_detail::adapted_sequence, (int, data))
+
+template <template <typename> class Scenario>
 void
 test()
 {
-    using namespace boost::fusion;
+    using namespace test_detail;
 
-    test_all<FUSION_SEQUENCE<FUSION_SEQUENCE<> > >();
+    BOOST_TEST(boost::fusion::traits::is_sequence<adapted_sequence>::value);
-    test_all<FUSION_SEQUENCE<FUSION_SEQUENCE<>, int> >();
+    BOOST_TEST(boost::fusion::size(adapted_sequence()) == 1);
-    test_all<FUSION_SEQUENCE<int, FUSION_SEQUENCE<> > >();
-    test_all<FUSION_SEQUENCE<int, FUSION_SEQUENCE<>, float> >();
 
-    test_all<FUSION_SEQUENCE<FUSION_SEQUENCE<int> > >();
+    BOOST_TEST((
-    test_all<FUSION_SEQUENCE<FUSION_SEQUENCE<int>, int> >();
+        run< Scenario< FUSION_SEQUENCE< FUSION_SEQUENCE<> > > >(
-    test_all<FUSION_SEQUENCE<int, FUSION_SEQUENCE<int> > >();
+            FUSION_SEQUENCE< FUSION_SEQUENCE<> >()
-    test_all<FUSION_SEQUENCE<int, FUSION_SEQUENCE<int>, float> >();
+        )
+    ));
+    BOOST_TEST((
+        run< Scenario<FUSION_SEQUENCE<FUSION_SEQUENCE<>, int> > >(
+            FUSION_SEQUENCE< FUSION_SEQUENCE<>, int>(FUSION_SEQUENCE<>(), 325)
+        )
+    ));
+    BOOST_TEST((
+        run< Scenario< FUSION_SEQUENCE<int, FUSION_SEQUENCE<> > > >(
+            FUSION_SEQUENCE< int, FUSION_SEQUENCE<> >(325, FUSION_SEQUENCE<>())
+        )
+    ));
+    BOOST_TEST((
+        run< Scenario<FUSION_SEQUENCE<int, FUSION_SEQUENCE<>, float> > >(
+            FUSION_SEQUENCE<int, FUSION_SEQUENCE<> , float>(
+                325, FUSION_SEQUENCE<>(), 2.0f
+            )
+        )
+    ));
 
-    test_all<FUSION_SEQUENCE<FUSION_SEQUENCE<int, float> > >();
+    BOOST_TEST((
-    test_all<FUSION_SEQUENCE<FUSION_SEQUENCE<int, float>, int> >();
+        run< Scenario< FUSION_SEQUENCE< FUSION_SEQUENCE<int> > > >(
-    test_all<FUSION_SEQUENCE<int, FUSION_SEQUENCE<int, float> > >();
+            FUSION_SEQUENCE< FUSION_SEQUENCE<int> >(FUSION_SEQUENCE<int>(400))
-    test_all<FUSION_SEQUENCE<int, FUSION_SEQUENCE<int, float>, float> >();
+        )
+    ));
+    BOOST_TEST((
+        run< Scenario< FUSION_SEQUENCE<adapted_sequence> > >(
+            FUSION_SEQUENCE<adapted_sequence>(adapted_sequence(400))
+        )
+    ));
+    BOOST_TEST((
+        run< Scenario<FUSION_SEQUENCE<FUSION_SEQUENCE<int>, int> > >(
+            FUSION_SEQUENCE<FUSION_SEQUENCE<int>, int>(
+                FUSION_SEQUENCE<int>(325), 400
+            )
+        )
+    ));
+    BOOST_TEST((
+        run< Scenario<FUSION_SEQUENCE<adapted_sequence, int> > >(
+           FUSION_SEQUENCE<adapted_sequence, int>(adapted_sequence(325), 400)
+        )
+    ));
+    BOOST_TEST((
+        run< Scenario< FUSION_SEQUENCE< int, FUSION_SEQUENCE<int> > > >(
+            FUSION_SEQUENCE< int, FUSION_SEQUENCE<int> >(
+                325, FUSION_SEQUENCE<int>(400)
+            )
+        )
+    ));
+    BOOST_TEST((
+        run< Scenario< FUSION_SEQUENCE<int, adapted_sequence> > >(
+            FUSION_SEQUENCE<int, adapted_sequence>(325, adapted_sequence(450))
+        )
+    ));
+    BOOST_TEST((
+        run< Scenario< FUSION_SEQUENCE<int, FUSION_SEQUENCE<int>, int> > >(
+            FUSION_SEQUENCE<int, FUSION_SEQUENCE<int>, int>(
+                500, FUSION_SEQUENCE<int>(350), 200
+            )
+        )
+    ));
+    BOOST_TEST((
+        run< Scenario< FUSION_SEQUENCE<int, adapted_sequence, int> > >(
+            FUSION_SEQUENCE<int, adapted_sequence, int>(
+                300, adapted_sequence(500), 400)
+        )
+    ));
 
-    test_all<FUSION_SEQUENCE<FUSION_SEQUENCE<>, FUSION_SEQUENCE<> > >();
+    BOOST_TEST((
-    test_all<FUSION_SEQUENCE<FUSION_SEQUENCE<int>, FUSION_SEQUENCE<> > >();
+        run< Scenario< FUSION_SEQUENCE< FUSION_SEQUENCE<int, int> > > >(
-    test_all<FUSION_SEQUENCE<FUSION_SEQUENCE<>, FUSION_SEQUENCE<int> > >();
+            FUSION_SEQUENCE< FUSION_SEQUENCE<int, int> >(
-    test_all<
+                FUSION_SEQUENCE<int, int>(450, 500)
-        FUSION_SEQUENCE<FUSION_SEQUENCE<int>, FUSION_SEQUENCE<float> >
+            )
-    >();
+        )
-    test_all<
+    ));
-        FUSION_SEQUENCE<FUSION_SEQUENCE<int, float>, FUSION_SEQUENCE<float> >
+    BOOST_TEST((
-    >();
+        run< Scenario< FUSION_SEQUENCE<FUSION_SEQUENCE<int, int>, int> > >(
-    test_all<
+            FUSION_SEQUENCE<FUSION_SEQUENCE<int, int>, int>(
-        FUSION_SEQUENCE<FUSION_SEQUENCE<int>, FUSION_SEQUENCE<float, int> >
+                FUSION_SEQUENCE<int, int>(450, 500), 150
-    >();
+            )
-    test_all<
+        )
-        FUSION_SEQUENCE<
+    ));
-            FUSION_SEQUENCE<int, float>, FUSION_SEQUENCE<float, int>
+    BOOST_TEST((
-        >
+        run< Scenario< FUSION_SEQUENCE< int, FUSION_SEQUENCE<int, int> > > >(
-    >();
+            FUSION_SEQUENCE< int, FUSION_SEQUENCE<int, int> >(
+                450, FUSION_SEQUENCE<int, int>(500, 150)
+            )
+        )
+    ));
+    BOOST_TEST((
+        run<Scenario< FUSION_SEQUENCE<int, FUSION_SEQUENCE<int, int>, int> > >(
+            FUSION_SEQUENCE<int, FUSION_SEQUENCE<int, int>, int>(
+                150, FUSION_SEQUENCE<int, int>(250, 350), 450
+            )
+        )
+    ));
+
+    BOOST_TEST((
+        run<Scenario<FUSION_SEQUENCE<FUSION_SEQUENCE<>, FUSION_SEQUENCE<> > > >(
+            FUSION_SEQUENCE< FUSION_SEQUENCE<>, FUSION_SEQUENCE<> >(
+                FUSION_SEQUENCE<>(), FUSION_SEQUENCE<>()
+            )
+        )
+    ));
+    BOOST_TEST((
+        run<Scenario<FUSION_SEQUENCE<FUSION_SEQUENCE<int>, FUSION_SEQUENCE<> > > >(
+            FUSION_SEQUENCE< FUSION_SEQUENCE<int>, FUSION_SEQUENCE<> >(
+                FUSION_SEQUENCE<int>(150), FUSION_SEQUENCE<>()
+            )
+        )
+    ));
+    BOOST_TEST((
+        run<Scenario<FUSION_SEQUENCE<FUSION_SEQUENCE<>, FUSION_SEQUENCE<int> > > >(
+            FUSION_SEQUENCE< FUSION_SEQUENCE<>, FUSION_SEQUENCE<int> >(
+                FUSION_SEQUENCE<>(), FUSION_SEQUENCE<int>(500)
+            )
+        )
+    ));
+    BOOST_TEST((
+        run<Scenario<FUSION_SEQUENCE<FUSION_SEQUENCE<int>, FUSION_SEQUENCE<int> > > >(
+            FUSION_SEQUENCE< FUSION_SEQUENCE<int>, FUSION_SEQUENCE<int> >(
+                FUSION_SEQUENCE<int>(155), FUSION_SEQUENCE<int>(255)
+            )
+        )
+    ));
+    BOOST_TEST((
+        run< Scenario<
+            FUSION_SEQUENCE< FUSION_SEQUENCE<int, int>, FUSION_SEQUENCE<int> >
+        > >(
+            FUSION_SEQUENCE< FUSION_SEQUENCE<int, int>, FUSION_SEQUENCE<int> >(
+                FUSION_SEQUENCE<int, int>(222, 333), FUSION_SEQUENCE<int>(444)
+            )
+        )
+    ));
+    BOOST_TEST((
+        run< Scenario<
+            FUSION_SEQUENCE< FUSION_SEQUENCE<int>, FUSION_SEQUENCE<int, int> >
+        > >(
+            FUSION_SEQUENCE< FUSION_SEQUENCE<int>, FUSION_SEQUENCE<int, int> >(
+                FUSION_SEQUENCE<int>(100), FUSION_SEQUENCE<int, int>(300, 400)
+            )
+        )
+    ));
+    BOOST_TEST((
+        run< Scenario<
+            FUSION_SEQUENCE< FUSION_SEQUENCE<int, int>, FUSION_SEQUENCE<int, int> >
+        > >(
+            FUSION_SEQUENCE< FUSION_SEQUENCE<int, int>, FUSION_SEQUENCE<int, int> >(
+                FUSION_SEQUENCE<int, int>(600, 700)
+              , FUSION_SEQUENCE<int, int>(800, 900)
+            )
+        )
+    ));
+
+
+    // Ignore desired scenario, and cheat to make these work
+    BOOST_TEST((
+        run< can_lvalue_construct< FUSION_SEQUENCE<FUSION_SEQUENCE<>&> > >(
+            FUSION_SEQUENCE<>()
+          , FUSION_SEQUENCE< FUSION_SEQUENCE<> >()
+        )
+    ));
+    BOOST_TEST((
+        run< can_construct< FUSION_SEQUENCE<const FUSION_SEQUENCE<>&> > >(
+            FUSION_SEQUENCE<>()
+          , FUSION_SEQUENCE< FUSION_SEQUENCE<> >()
+        )
+    ));
+    BOOST_TEST((
+        run< can_lvalue_construct< FUSION_SEQUENCE<FUSION_SEQUENCE<int>&> > >(
+            FUSION_SEQUENCE<int>(300)
+          , FUSION_SEQUENCE< FUSION_SEQUENCE<int> >(FUSION_SEQUENCE<int>(300))
+        )
+    ));
+    BOOST_TEST((
+        run< can_construct< FUSION_SEQUENCE<const FUSION_SEQUENCE<int>&> > >(
+            FUSION_SEQUENCE<int>(400)
+          , FUSION_SEQUENCE< FUSION_SEQUENCE<int> >(FUSION_SEQUENCE<int>(400))
+        )
+    ));
 }
-

test/sequence/traits.hpp

@@ -0,0 +1,251 @@
+/*=============================================================================
+    Copyright (C) 2016 Lee Clagett
+
+    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/config.hpp>
+#include <boost/detail/lightweight_test.hpp>
+#include <boost/fusion/container/list.hpp>
+#include <boost/fusion/container/vector.hpp>
+#include <boost/type_traits/add_const.hpp>
+#include <boost/type_traits/add_reference.hpp>
+#include <boost/type_traits/integral_constant.hpp>
+#include <boost/type_traits/is_constructible.hpp>
+#include <boost/type_traits/is_convertible.hpp>
+#include <boost/type_traits/remove_const.hpp>
+#include <boost/type_traits/remove_reference.hpp>
+
+struct convertible
+{
+    convertible(int) {}
+};
+
+template <typename From, typename To>
+bool is_convertible(bool has_conversion)
+{
+    typedef typename boost::remove_reference<
+        typename boost::remove_const<From>::type
+    >::type from_rvalue;
+    typedef typename boost::add_reference<from_rvalue>::type from_lvalue;
+    typedef typename boost::add_const<from_lvalue>::type from_const_lvalue;
+
+    return 
+        boost::is_convertible<from_rvalue, To>::value == has_conversion &&
+        boost::is_convertible<from_lvalue, To>::value == has_conversion &&
+        boost::is_convertible<from_const_lvalue, To>::value == has_conversion;
+}
+
+// is_constructible has a few requirements
+#if !defined(BOOST_NO_CXX11_DECLTYPE) &&   \
+    !defined(BOOST_NO_CXX11_TEMPLATES) &&  \
+    !defined(BOOST_NO_SFINAE_EXPR)
+
+#define FUSION_TEST_HAS_CONSTRUCTIBLE
+
+template <typename To, typename... Args>
+bool is_lvalue_constructible(bool has_constructor)
+{
+    return has_constructor ==
+        boost::is_constructible<
+            To
+          , typename boost::add_reference<Args>::type...
+        >::value;
+}
+
+template <typename To, typename... Args>
+bool is_constructible_impl(bool has_constructor)
+{
+    return
+        boost::is_constructible<To, Args...>::value == has_constructor &&
+        is_lvalue_constructible<To, Args...>(has_constructor) &&
+        is_lvalue_constructible<
+            To, typename boost::add_const<Args>::type...
+        >(has_constructor);
+}
+
+template <typename To, typename... Args>
+bool is_constructible(bool has_constructor)
+{
+    return
+        is_constructible_impl<
+            To
+          , typename boost::remove_reference<
+                typename boost::remove_const<Args>::type
+            >::type...
+        >(has_constructor);
+}
+
+void test_constructible()
+{
+    BOOST_TEST((is_constructible< FUSION_SEQUENCE<> >(true)));
+
+    BOOST_TEST((is_constructible< FUSION_SEQUENCE<int> >(true)));
+    BOOST_TEST((is_constructible<FUSION_SEQUENCE<int>, int>(true)));
+
+    BOOST_TEST((is_constructible<FUSION_SEQUENCE<convertible>, int>(true)));
+    BOOST_TEST((
+        is_constructible<FUSION_SEQUENCE<convertible>, convertible>(true)
+    ));
+        
+    BOOST_TEST((
+        is_constructible<FUSION_SEQUENCE<int, int>, int, int>(true)
+    ));
+
+    BOOST_TEST((
+        is_constructible<FUSION_SEQUENCE<convertible, int>, int, int>(true)
+    ));
+    BOOST_TEST((
+        is_constructible<
+            FUSION_SEQUENCE<convertible, int>, convertible, int
+        >(true)
+    ));
+    
+    BOOST_TEST((
+        is_constructible<FUSION_SEQUENCE<int, convertible>, int, int>(true)
+    ));
+    BOOST_TEST((
+        is_constructible<
+            FUSION_SEQUENCE<int, convertible>, int, convertible
+        >(true)
+    ));
+    
+    BOOST_TEST((
+        is_constructible<
+            FUSION_SEQUENCE<convertible, convertible>, int, int
+        >(true)
+    ));
+    BOOST_TEST((
+        is_constructible<
+            FUSION_SEQUENCE<convertible, convertible>, convertible, int
+        >(true)
+    ));
+    BOOST_TEST((
+        is_constructible<
+            FUSION_SEQUENCE<convertible, convertible>, int, convertible
+        >(true)
+    ));
+    BOOST_TEST((
+        is_constructible<
+            FUSION_SEQUENCE<convertible, convertible>, convertible, convertible
+        >(true)
+    ));
+}
+
+#endif // is_constructible is available
+
+void test_convertible(bool has_seq_conversion)
+{
+    BOOST_TEST((is_convertible<int, FUSION_SEQUENCE<> >(false)));
+    BOOST_TEST((is_convertible<int, FUSION_SEQUENCE<int> >(false)));
+    BOOST_TEST((is_convertible<int, FUSION_SEQUENCE<const int&> >(false)));
+    BOOST_TEST((is_convertible<int, FUSION_SEQUENCE<convertible> >(false)));
+    BOOST_TEST((
+        is_convertible<int, FUSION_SEQUENCE<const convertible&> >(false)
+    ));
+    BOOST_TEST((is_convertible<int, FUSION_SEQUENCE<int, int> >(false)));
+    BOOST_TEST((
+        is_convertible<int, FUSION_SEQUENCE<const int&, const int&> >(false)
+    ));
+    BOOST_TEST((is_convertible<int, FUSION_SEQUENCE<convertible, int> >(false)));
+    BOOST_TEST((
+        is_convertible<int, FUSION_SEQUENCE<const convertible&, const int&> >(false)
+    ));
+    BOOST_TEST((is_convertible<int, FUSION_SEQUENCE<int, convertible> >(false)));
+    BOOST_TEST((
+        is_convertible<int, FUSION_SEQUENCE<const int&, const convertible&> >(false)
+    ));
+    BOOST_TEST((
+        is_convertible<int, FUSION_SEQUENCE<convertible, convertible> >(false)
+    ));
+    BOOST_TEST((
+        is_convertible<
+            int, FUSION_SEQUENCE<const convertible&, const convertible&>
+        >(false)
+    ));
+
+    BOOST_TEST((is_convertible<FUSION_SEQUENCE<>, FUSION_SEQUENCE<> >(true)));
+    BOOST_TEST((
+        is_convertible<FUSION_SEQUENCE<int>, FUSION_SEQUENCE<int> >(true)
+    ));
+    BOOST_TEST((
+        is_convertible<FUSION_SEQUENCE<int>, FUSION_SEQUENCE<const int&> >(true)
+    ));
+    BOOST_TEST((
+        is_convertible<FUSION_SEQUENCE<int>, FUSION_SEQUENCE<convertible> >(true)
+    ));
+    BOOST_TEST((
+        is_convertible<FUSION_SEQUENCE<int, int>, FUSION_SEQUENCE<int, int> >(true)
+    ));
+    BOOST_TEST((
+        is_convertible<
+            FUSION_SEQUENCE<int, int>, FUSION_SEQUENCE<const int&, const int&>
+        >(true)
+    ));
+    BOOST_TEST((
+        is_convertible<
+            FUSION_SEQUENCE<int, int>, FUSION_SEQUENCE<convertible, int>
+        >(true)
+    ));
+    BOOST_TEST((
+        is_convertible<
+            FUSION_SEQUENCE<int, int>, FUSION_SEQUENCE<int, convertible>
+        >(true)
+    ));
+    BOOST_TEST((
+        is_convertible<
+            FUSION_SEQUENCE<int, int>
+          , FUSION_SEQUENCE<convertible, convertible>
+        >(true)
+    ));
+
+    BOOST_TEST((
+        is_convertible<
+            FUSION_ALT_SEQUENCE<>, FUSION_SEQUENCE<>
+        >(has_seq_conversion)
+    ));
+    BOOST_TEST((
+        is_convertible<
+            FUSION_ALT_SEQUENCE<int>, FUSION_SEQUENCE<int>
+        >(has_seq_conversion)
+    ));
+    BOOST_TEST((
+        is_convertible<
+            FUSION_ALT_SEQUENCE<int>, FUSION_SEQUENCE<const int&>
+        >(has_seq_conversion)
+    ));
+    BOOST_TEST((
+        is_convertible<
+            FUSION_ALT_SEQUENCE<int>, FUSION_SEQUENCE<convertible>
+        >(has_seq_conversion)
+    ));
+    BOOST_TEST((
+        is_convertible<
+            FUSION_ALT_SEQUENCE<int, int>, FUSION_SEQUENCE<int, int>
+        >(has_seq_conversion)
+    ));
+    BOOST_TEST((
+        is_convertible<
+            FUSION_ALT_SEQUENCE<int, int>
+          , FUSION_SEQUENCE<const int&, const int&>
+        >(has_seq_conversion)
+    ));
+    BOOST_TEST((
+        is_convertible<
+            FUSION_ALT_SEQUENCE<int, int>, FUSION_SEQUENCE<convertible, int>
+        >(has_seq_conversion)
+    ));
+    BOOST_TEST((
+        is_convertible<
+            FUSION_ALT_SEQUENCE<int, int>, FUSION_SEQUENCE<int, convertible>
+        >(has_seq_conversion)
+    ));
+    BOOST_TEST((
+        is_convertible<
+            FUSION_ALT_SEQUENCE<int, int>
+          , FUSION_SEQUENCE<convertible, convertible>
+        >(has_seq_conversion)
+    ));
+}
+

test/sequence/tuple_conversion.cpp

@@ -0,0 +1,51 @@
+/*=============================================================================
+    Copyright (c) 2016 Lee Clagett
+
+    Use modification and distribution are subject to 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/fusion/tuple.hpp>
+
+#define FUSION_SEQUENCE boost::fusion::tuple
+#include "conversion.hpp"
+
+// Bug in C++03 tuple? Cannot construct from a std::pair without including
+// std::pair fusion adaption
+#if !defined(BOOST_FUSION_HAS_VARIADIC_TUPLE)
+# include <boost/fusion/adapted/std_pair.hpp>
+#endif
+
+using namespace test_detail;
+
+void test_tuple()
+{
+    BOOST_TEST((
+        run< can_copy< boost::fusion::tuple<int, int> > >(
+            std::pair<int, int>(1, 9)
+        )
+    ));
+    BOOST_TEST((
+        run< can_copy< boost::fusion::tuple<int, convertible> > >(
+            std::pair<int, int>(1, 9)
+        )
+    ));
+    BOOST_TEST((
+        run< can_copy< boost::fusion::tuple<convertible, int> > >(
+            std::pair<int, int>(1, 9)
+        )
+    ));
+    BOOST_TEST((
+        run< can_copy< boost::fusion::tuple<convertible, convertible> > >(
+            std::pair<int, int>(1, 9)
+        )
+    ));
+}
+
+int main()
+{
+    test<can_assign>(); // conversion construction not supported
+    test_tuple();
+    return boost::report_errors();
+}

test/sequence/tuple_copy.cpp

@@ -16,7 +16,7 @@
 int
 main()
 {
-    test();
+    test<test_detail::can_copy>();
     return boost::report_errors();
 }
 

test/sequence/tuple_nest.cpp

@@ -7,13 +7,29 @@
 #include <boost/fusion/tuple/tuple.hpp>
 #include <boost/core/lightweight_test.hpp>
 
-#define FUSION_SEQUENCE tuple
+#define FUSION_SEQUENCE boost::fusion::tuple
 #include "nest.hpp"
 
+
+// tuple does not support conversion construction from sequence by design
+template <typename T>
+struct skip_constructor_conversion
+{
+    template <typename Source, typename Expected>
+    bool operator()(Source const& source, Expected const& expected) const
+    {
+        using namespace test_detail;
+        return
+            run< can_copy<T> >(source, expected) &&
+            run< can_convert_using<can_assign>::to<T> >(source, expected) &&
+            run< can_construct_from_elements<T> >(source, expected);            
+    }
+};
+
 int
 main()
 {
-    test();
+    test<skip_constructor_conversion>();
     return boost::report_errors();
 }
 

test/sequence/tuple_traits.cpp

@@ -11,15 +11,11 @@
 #include <boost/type_traits/is_constructible.hpp>
 #include <boost/type_traits/is_convertible.hpp>
 
-struct test_conversion
+#define FUSION_SEQUENCE boost::fusion::tuple
-{
+#define FUSION_ALT_SEQUENCE boost::fusion::vector
-    test_conversion(int) {}
+#include "traits.hpp"
-};
 
-struct test_no_conversion
+struct not_convertible {};
-{
-    explicit test_no_conversion(int) {}
-};
 
 /*  Some construction differences in fusion::tuple from std::tuple:
       - Construction from elements cannot call an explicit constructor.
@@ -36,88 +32,55 @@ struct test_no_conversion
     could break existing code, however, switching to fusion::vector would
     restore the historical behavior. */
 int
-main() {
+main()
-    {
+{
-        using namespace boost;
+    using namespace boost::fusion;
-        using namespace boost::fusion;
 
-        BOOST_TEST(!(is_convertible<int, tuple<> >::value));
+    test_convertible(false /* no conversion construction */ );
-        BOOST_TEST(!(is_convertible<int&, tuple<> >::value));
 
-        BOOST_TEST(!(is_convertible< int, tuple<int> >::value));
+    BOOST_TEST((is_convertible<std::pair<int, int>, tuple<int, int> >(true)));
-        BOOST_TEST(!(is_convertible< int&, tuple<int> >::value));
+    BOOST_TEST((
-        BOOST_TEST(!(is_convertible< vector<int>, tuple<int> >::value));
+        is_convertible<std::pair<int, int>, tuple<convertible, int> >(true)
-        BOOST_TEST(!(is_convertible< vector<int>&, tuple<int> >::value));
+    ));
+    BOOST_TEST((
+        is_convertible<std::pair<int, int>, tuple<int, convertible> >(true)
+    ));
+    BOOST_TEST((
+        is_convertible<
+            std::pair<int, int>, tuple<convertible, convertible>
+        >(true)
+    ));
 
-        BOOST_TEST(!(is_convertible<int, tuple<int, int> >::value));
+#if defined(FUSION_TEST_HAS_CONSTRUCTIBLE)
-        BOOST_TEST(!(is_convertible<int&, tuple<int, int> >::value));
+    test_constructible();
-    }
 
-// is_constructible has some restrictions ...
+    BOOST_TEST((is_constructible< tuple<> >(true)));
-#if !(defined(BOOST_NO_CXX11_DECLTYPE) || defined(BOOST_NO_CXX11_TEMPLATES) || \
+    BOOST_TEST((is_constructible<tuple<>, int>(false)));
-     defined(BOOST_NO_SFINAE_EXPR))
-    {
-        using namespace boost;
-        using namespace boost::fusion;
 
-        BOOST_TEST((is_constructible< tuple<> >::value));
+    BOOST_TEST((is_constructible< tuple<int> >(true)));
-        BOOST_TEST(!(is_constructible<tuple<>, int>::value));
+    BOOST_TEST((is_constructible<tuple<int>, int>(true)));
-        BOOST_TEST(!(is_constructible<tuple<>, int&>::value));
+    BOOST_TEST((is_constructible<tuple<convertible>, int>(true)));
+    BOOST_TEST((is_constructible<tuple<not_convertible>, int>(false)));
+    BOOST_TEST((is_constructible< tuple<int>, vector<int> >(false)));
+    BOOST_TEST((is_constructible<tuple<int>, int, int>(false)));
 
-        BOOST_TEST((is_constructible< tuple<int> >::value));
+    BOOST_TEST((is_constructible< tuple<int, int> >(true)));
-        BOOST_TEST((is_constructible<tuple<int>, int>::value));
+    BOOST_TEST((is_constructible<tuple<int, int>, int, int>(true)));
-        BOOST_TEST((is_constructible<tuple<int>, int&>::value));
+    BOOST_TEST((
-        BOOST_TEST((is_constructible<tuple<test_conversion>, int>::value));
+        is_constructible<tuple<convertible, convertible>, int, int>(true)
-        BOOST_TEST((is_constructible<tuple<test_conversion>, int&>::value));
+    ));
-        BOOST_TEST(!(is_constructible<tuple<test_no_conversion>, int>::value));
+    BOOST_TEST((is_constructible<tuple<int, not_convertible>, int, int>(false)));
-        BOOST_TEST(!(is_constructible<tuple<test_no_conversion>, int&>::value));
+    BOOST_TEST((is_constructible<tuple<not_convertible, int>, int, int>(false)));
-        BOOST_TEST(!(is_constructible< tuple<int>, vector<int> >::value));
+    BOOST_TEST((
-        BOOST_TEST(!(is_constructible<tuple<int>, vector<int>&>::value));
+        is_constructible<tuple<not_convertible, not_convertible>, int, int>(false)
-        BOOST_TEST(!(is_constructible<tuple<int>, int, int>::value));
+    ));
-        BOOST_TEST(!(is_constructible<tuple<int>, int&, int&>::value));
-
-        BOOST_TEST((is_constructible< tuple<int, int> >::value));
-        BOOST_TEST((is_constructible<tuple<int, int>, int, int>::value));
-        BOOST_TEST((is_constructible<tuple<int, int>, int&, int&>::value));
-        BOOST_TEST((
-            is_constructible<
-                tuple<test_conversion, test_conversion>
-              , int
-              , int
-            >::value
-        ));
-        BOOST_TEST((
-            is_constructible<
-                tuple<test_conversion, test_conversion>
-              , int&
-              , int&
-            >::value
-        ));
-        BOOST_TEST(!(
-            is_constructible<
-                tuple<test_no_conversion, test_no_conversion>
-              , int
-              , int
-            >::value
-        ));
-        BOOST_TEST(!(
-            is_constructible<
-                tuple<test_no_conversion, test_no_conversion>
-              , int&
-              , int&
-            >::value
-        ));
 #if defined(BOOST_FUSION_HAS_VARIADIC_VECTOR)
-        // C++03 fusion::tuple has constructors that can never be used
+    // C++03 fusion::tuple has constructors that can never be used
-        BOOST_TEST(!(is_constructible<tuple<int, int>, int>::value));
+    BOOST_TEST((is_constructible<tuple<int, int>, int>(false)));
-        BOOST_TEST(!(is_constructible<tuple<int, int>, int&>::value));
-#endif
-        BOOST_TEST(!(is_constructible<tuple<int, int>, int, int, int>::value));
-        BOOST_TEST(!(
-            is_constructible<tuple<int, int>, int&, int&, int&>::value
-        ));
-    }
 #endif
+    BOOST_TEST((is_constructible<tuple<int, int>, int, int, int>(false)));
+
+#endif // FUSION_TEST_HAS_CONSTRUCTIBLE
 
     return boost::report_errors();
 }

test/sequence/vector_conversion.cpp

@@ -0,0 +1,19 @@
+/*=============================================================================
+    Copyright (c) 2016 Lee Clagett
+
+    Use modification and distribution are subject to 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/fusion/container/vector.hpp>
+
+#define FUSION_SEQUENCE boost::fusion::vector
+#include "conversion.hpp"
+
+int main()
+{
+    test<test_detail::can_copy>();
+    return boost::report_errors();
+}

test/sequence/vector_copy.cpp

@@ -15,7 +15,7 @@
 int
 main()
 {
-    test();
+    test<test_detail::can_copy>();
     return boost::report_errors();
 }
 

test/sequence/vector_nest.cpp

@@ -7,13 +7,13 @@
 #include <boost/fusion/container/vector/vector.hpp>
 #include <boost/core/lightweight_test.hpp>
 
-#define FUSION_SEQUENCE vector
+#define FUSION_SEQUENCE boost::fusion::vector
 #include "nest.hpp"
 
 int
 main()
 {
-    test();
+    test<test_detail::can_nest>();
     return boost::report_errors();
 }
 

test/sequence/vector_traits.cpp

@@ -0,0 +1,32 @@
+/*=============================================================================
+    Copyright (C) 2016 Lee Clagett
+
+    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/fusion/container/list.hpp>
+#include <boost/fusion/container/vector.hpp>
+
+#define FUSION_SEQUENCE boost::fusion::vector
+#define FUSION_ALT_SEQUENCE boost::fusion::list
+#include "traits.hpp"
+
+int main() {
+    test_convertible(true /* has conversion construction */ );
+
+    // C++11 models overly aggressive (bug) implicit conversion from C++03
+    BOOST_TEST((
+        is_convertible<
+            boost::fusion::list<int>
+          , boost::fusion::vector< boost::fusion::list<int> >
+        >(true)
+    ));
+
+#if defined(FUSION_TEST_HAS_CONSTRUCTIBLE)
+    test_constructible();
+#endif
+
+    return boost::report_errors();
+}