diff --git a/test/Jamfile b/test/Jamfile
index 7e5e4186..4e586b58 100644
--- a/test/Jamfile
+++ b/test/Jamfile
@@ -165,24 +165,42 @@ project
     [ run sequence/repetitive_view.cpp : : : : ]
     [ run sequence/deduce_sequence.cpp : : : : ]
     [ run sequence/adapt_adt_named.cpp : : : : ]
+    [ run sequence/adapt_adt_named_empty.cpp : : : : ]
     [ run sequence/adapt_adt.cpp : : : : ]
+    [ run sequence/adapt_adt_empty.cpp : : : : ]
     [ run sequence/adapt_assoc_adt_named.cpp : : : : ]
+    [ run sequence/adapt_assoc_adt_named_empty.cpp : : : : ]
     [ run sequence/adapt_assoc_adt.cpp : : : : ]
+    [ run sequence/adapt_assoc_adt_empty.cpp : : : : ]
     [ run sequence/adapt_assoc_struct_named.cpp : : : : ]
+    [ run sequence/adapt_assoc_struct_named_empty.cpp : : : : ]
     [ run sequence/adapt_assoc_struct.cpp : : : : ]
+    [ run sequence/adapt_assoc_struct_empty.cpp : : : : ]
     [ run sequence/adapt_assoc_tpl_adt.cpp : : : : ]
+    [ run sequence/adapt_assoc_tpl_adt_empty.cpp : : : : ]
     [ run sequence/adapt_assoc_tpl_struct.cpp : : : : ]
+    [ run sequence/adapt_assoc_tpl_struct_empty.cpp : : : : ]
     [ run sequence/adapt_struct_named.cpp : : : : ]
+    [ run sequence/adapt_struct_named_empty.cpp : : : : ]
     [ run sequence/adapt_struct.cpp : : : : ]
+    [ run sequence/adapt_struct_empty.cpp : : : : ]
     [ run sequence/adapt_tpl_adt.cpp : : : : ]
+    [ run sequence/adapt_tpl_adt_empty.cpp : : : : ]
     [ run sequence/adapt_tpl_struct.cpp : : : : ]
+    [ run sequence/adapt_tpl_struct_empty.cpp : : : : ]
     [ run sequence/adt_attribute_proxy.cpp : : : : ]
     [ run sequence/define_struct.cpp : : : : ]
+    [ run sequence/define_struct_empty.cpp : : : : ]
     [ run sequence/define_struct_inline.cpp : : : : ]
+    [ run sequence/define_struct_inline_empty.cpp : : : : ]
     [ run sequence/define_assoc_struct.cpp : : : : ]
+    [ run sequence/define_assoc_struct_empty.cpp : : : : ]
     [ run sequence/define_tpl_struct.cpp : : : : ]
+    [ run sequence/define_tpl_struct_empty.cpp : : : : ]
     [ run sequence/define_tpl_struct_inline.cpp : : : : ]
+    [ run sequence/define_tpl_struct_inline_empty.cpp : : : : ]
     [ run sequence/define_assoc_tpl_struct.cpp : : : : ]
+    [ run sequence/define_assoc_tpl_struct_empty.cpp : : : : ]
     [ run sequence/std_tuple.cpp : : : : ]
     [ run sequence/std_tuple_iterator.cpp : : : : ]
     [ run sequence/ref_vector.cpp : : : : ]
diff --git a/test/sequence/adapt_adt_empty.cpp b/test/sequence/adapt_adt_empty.cpp
new file mode 100644
index 00000000..925cdce0
--- /dev/null
+++ b/test/sequence/adapt_adt_empty.cpp
@@ -0,0 +1,86 @@
+/*=============================================================================
+    Copyright (c) 2016 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/fusion/adapted/adt/adapt_adt.hpp>
+#include <boost/fusion/sequence/intrinsic/size.hpp>
+#include <boost/fusion/sequence/intrinsic/empty.hpp>
+#include <boost/fusion/sequence/intrinsic/begin.hpp>
+#include <boost/fusion/sequence/intrinsic/end.hpp>
+#include <boost/fusion/sequence/io/out.hpp>
+#include <boost/fusion/iterator/equal_to.hpp>
+#include <boost/fusion/container/vector/vector.hpp>
+#include <boost/fusion/container/list/list.hpp>
+#include <boost/fusion/container/generation/make_vector.hpp>
+#include <boost/fusion/sequence/comparison/equal_to.hpp>
+#include <boost/fusion/sequence/comparison/not_equal_to.hpp>
+#include <boost/fusion/sequence/comparison/less.hpp>
+#include <boost/fusion/sequence/comparison/less_equal.hpp>
+#include <boost/fusion/sequence/comparison/greater.hpp>
+#include <boost/fusion/sequence/comparison/greater_equal.hpp>
+#include <boost/fusion/mpl.hpp>
+#include <boost/fusion/support/is_view.hpp>
+#include <boost/mpl/is_sequence.hpp>
+#include <boost/mpl/assert.hpp>
+#include <iostream>
+
+class empty_adt{};
+BOOST_FUSION_ADAPT_ADT(empty_adt,)
+
+int
+main()
+{
+    using namespace boost::fusion;
+    using namespace boost;
+
+    std::cout << tuple_open('[');
+    std::cout << tuple_close(']');
+    std::cout << tuple_delimiter(", ");
+
+    {
+        BOOST_MPL_ASSERT_NOT((traits::is_view<empty_adt>));
+        empty_adt e;
+
+        std::cout << e << std::endl;
+        BOOST_TEST(e == make_vector());
+
+        BOOST_STATIC_ASSERT(fusion::result_of::size<empty_adt>::value == 0);
+        BOOST_MPL_ASSERT((fusion::result_of::empty<empty_adt>));
+
+        BOOST_MPL_ASSERT((fusion::result_of::equal_to<
+            fusion::result_of::begin<empty_adt>::type,
+            fusion::result_of::end<empty_adt>::type>));
+    }
+
+    {
+        fusion::vector<> v;
+        empty_adt e;
+        BOOST_TEST(v == e);
+        BOOST_TEST_NOT(v != e);
+        BOOST_TEST_NOT(v < e);
+        BOOST_TEST(v <= e);
+        BOOST_TEST_NOT(e > v);
+        BOOST_TEST(e >= v);
+    }
+
+    {
+        empty_adt e;
+
+        // conversion from empty_adt to vector
+        fusion::vector<> v(e);
+        v = e;
+
+        // FIXME
+        // conversion from empty_adt to list
+        //fusion::list<> l(e);
+        //l = e;
+    }
+
+    BOOST_MPL_ASSERT((mpl::is_sequence<empty_adt>));
+
+    return boost::report_errors();
+}
+
diff --git a/test/sequence/adapt_adt_named_empty.cpp b/test/sequence/adapt_adt_named_empty.cpp
new file mode 100644
index 00000000..f750071d
--- /dev/null
+++ b/test/sequence/adapt_adt_named_empty.cpp
@@ -0,0 +1,87 @@
+/*=============================================================================
+    Copyright (c) 2016 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/fusion/adapted/adt/adapt_adt_named.hpp>
+#include <boost/fusion/sequence/intrinsic/size.hpp>
+#include <boost/fusion/sequence/intrinsic/empty.hpp>
+#include <boost/fusion/sequence/intrinsic/begin.hpp>
+#include <boost/fusion/sequence/intrinsic/end.hpp>
+#include <boost/fusion/sequence/io/out.hpp>
+#include <boost/fusion/iterator/equal_to.hpp>
+#include <boost/fusion/container/vector/vector.hpp>
+#include <boost/fusion/container/list/list.hpp>
+#include <boost/fusion/container/generation/make_vector.hpp>
+#include <boost/fusion/sequence/comparison/equal_to.hpp>
+#include <boost/fusion/sequence/comparison/not_equal_to.hpp>
+#include <boost/fusion/sequence/comparison/less.hpp>
+#include <boost/fusion/sequence/comparison/less_equal.hpp>
+#include <boost/fusion/sequence/comparison/greater.hpp>
+#include <boost/fusion/sequence/comparison/greater_equal.hpp>
+#include <boost/fusion/mpl.hpp>
+#include <boost/fusion/support/is_view.hpp>
+#include <boost/mpl/is_sequence.hpp>
+#include <boost/mpl/assert.hpp>
+#include <iostream>
+
+class empty_adt{};
+BOOST_FUSION_ADAPT_ADT_NAMED(::empty_adt,empty_adt,)
+
+int
+main()
+{
+    using namespace boost::fusion;
+    using namespace boost;
+
+    std::cout << tuple_open('[');
+    std::cout << tuple_close(']');
+    std::cout << tuple_delimiter(", ");
+
+    empty_adt empty;
+    {
+        BOOST_MPL_ASSERT((traits::is_view<adapted::empty_adt>));
+        adapted::empty_adt e(empty);
+
+        std::cout << e << std::endl;
+        BOOST_TEST(e == make_vector());
+
+        BOOST_STATIC_ASSERT(fusion::result_of::size<adapted::empty_adt>::value == 0);
+        BOOST_MPL_ASSERT((fusion::result_of::empty<adapted::empty_adt>));
+
+        BOOST_MPL_ASSERT((fusion::result_of::equal_to<
+            fusion::result_of::begin<adapted::empty_adt>::type,
+            fusion::result_of::end<adapted::empty_adt>::type>));
+    }
+
+    {
+        fusion::vector<> v;
+        adapted::empty_adt e(empty);
+        BOOST_TEST(v == e);
+        BOOST_TEST_NOT(v != e);
+        BOOST_TEST_NOT(v < e);
+        BOOST_TEST(v <= e);
+        BOOST_TEST_NOT(e > v);
+        BOOST_TEST(e >= v);
+    }
+
+    {
+        adapted::empty_adt e(empty);
+
+        // conversion from empty_adt to vector
+        fusion::vector<> v(e);
+        v = e;
+
+        // FIXME
+        // conversion from empty_adt to list
+        //fusion::list<> l(e);
+        //l = e;
+    }
+
+    BOOST_MPL_ASSERT((mpl::is_sequence<adapted::empty_adt>));
+
+    return boost::report_errors();
+}
+
diff --git a/test/sequence/adapt_assoc_adt_empty.cpp b/test/sequence/adapt_assoc_adt_empty.cpp
new file mode 100644
index 00000000..8d4d2a28
--- /dev/null
+++ b/test/sequence/adapt_assoc_adt_empty.cpp
@@ -0,0 +1,88 @@
+/*=============================================================================
+    Copyright (c) 2016 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/fusion/adapted/adt/adapt_assoc_adt.hpp>
+#include <boost/fusion/sequence/intrinsic/size.hpp>
+#include <boost/fusion/sequence/intrinsic/empty.hpp>
+#include <boost/fusion/sequence/intrinsic/begin.hpp>
+#include <boost/fusion/sequence/intrinsic/end.hpp>
+#include <boost/fusion/sequence/io/out.hpp>
+#include <boost/fusion/iterator/equal_to.hpp>
+#include <boost/fusion/container/vector/vector.hpp>
+#include <boost/fusion/container/list/list.hpp>
+#include <boost/fusion/container/generation/make_vector.hpp>
+#include <boost/fusion/sequence/comparison/equal_to.hpp>
+#include <boost/fusion/sequence/comparison/not_equal_to.hpp>
+#include <boost/fusion/sequence/comparison/less.hpp>
+#include <boost/fusion/sequence/comparison/less_equal.hpp>
+#include <boost/fusion/sequence/comparison/greater.hpp>
+#include <boost/fusion/sequence/comparison/greater_equal.hpp>
+#include <boost/fusion/mpl.hpp>
+#include <boost/fusion/support/is_view.hpp>
+#include <boost/mpl/is_sequence.hpp>
+#include <boost/mpl/assert.hpp>
+#include <iostream>
+
+class empty_adt{};
+BOOST_FUSION_ADAPT_ASSOC_ADT(empty_adt,)
+
+int
+main()
+{
+    using namespace boost::fusion;
+    using namespace boost;
+
+    std::cout << tuple_open('[');
+    std::cout << tuple_close(']');
+    std::cout << tuple_delimiter(", ");
+
+    {
+        BOOST_MPL_ASSERT_NOT((traits::is_view<empty_adt>));
+        empty_adt e;
+
+        std::cout << e << std::endl;
+        BOOST_TEST(e == make_vector());
+
+        BOOST_STATIC_ASSERT(fusion::result_of::size<empty_adt>::value == 0);
+        BOOST_MPL_ASSERT((fusion::result_of::empty<empty_adt>));
+
+        BOOST_MPL_ASSERT((fusion::result_of::equal_to<
+            fusion::result_of::begin<empty_adt>::type,
+            fusion::result_of::end<empty_adt>::type>));
+    }
+
+    {
+        fusion::vector<> v;
+        empty_adt e;
+        BOOST_TEST(v == e);
+        BOOST_TEST_NOT(e != v);
+        BOOST_TEST_NOT(v < e);
+        BOOST_TEST(v <= e);
+        BOOST_TEST_NOT(e > v);
+        BOOST_TEST(e >= v);
+    }
+
+    {
+        empty_adt e;
+
+        // conversion from empty_adt to vector
+        fusion::vector<> v(e);
+        v = e;
+
+        // FIXME
+        // conversion from empty_adt to list
+        //fusion::list<> l(e);
+        //l = e;
+    }
+
+    BOOST_MPL_ASSERT((mpl::is_sequence<empty_adt>));
+    BOOST_MPL_ASSERT_NOT((fusion::result_of::has_key<empty_adt, void>));
+    BOOST_MPL_ASSERT_NOT((fusion::result_of::has_key<empty_adt, int>));
+
+    return boost::report_errors();
+}
+
diff --git a/test/sequence/adapt_assoc_adt_named_empty.cpp b/test/sequence/adapt_assoc_adt_named_empty.cpp
new file mode 100644
index 00000000..c8fa102a
--- /dev/null
+++ b/test/sequence/adapt_assoc_adt_named_empty.cpp
@@ -0,0 +1,89 @@
+/*=============================================================================
+    Copyright (c) 2016 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/fusion/adapted/adt/adapt_assoc_adt_named.hpp>
+#include <boost/fusion/sequence/intrinsic/size.hpp>
+#include <boost/fusion/sequence/intrinsic/empty.hpp>
+#include <boost/fusion/sequence/intrinsic/begin.hpp>
+#include <boost/fusion/sequence/intrinsic/end.hpp>
+#include <boost/fusion/sequence/io/out.hpp>
+#include <boost/fusion/iterator/equal_to.hpp>
+#include <boost/fusion/container/vector/vector.hpp>
+#include <boost/fusion/container/list/list.hpp>
+#include <boost/fusion/container/generation/make_vector.hpp>
+#include <boost/fusion/sequence/comparison/equal_to.hpp>
+#include <boost/fusion/sequence/comparison/not_equal_to.hpp>
+#include <boost/fusion/sequence/comparison/less.hpp>
+#include <boost/fusion/sequence/comparison/less_equal.hpp>
+#include <boost/fusion/sequence/comparison/greater.hpp>
+#include <boost/fusion/sequence/comparison/greater_equal.hpp>
+#include <boost/fusion/mpl.hpp>
+#include <boost/fusion/support/is_view.hpp>
+#include <boost/mpl/is_sequence.hpp>
+#include <boost/mpl/assert.hpp>
+#include <iostream>
+
+class empty_adt{};
+BOOST_FUSION_ADAPT_ASSOC_ADT_NAMED(::empty_adt,empty_adt,)
+
+int
+main()
+{
+    using namespace boost::fusion;
+    using namespace boost;
+
+    std::cout << tuple_open('[');
+    std::cout << tuple_close(']');
+    std::cout << tuple_delimiter(", ");
+
+    empty_adt empty;
+    {
+        BOOST_MPL_ASSERT((traits::is_view<adapted::empty_adt>));
+        adapted::empty_adt e(empty);
+
+        std::cout << e << std::endl;
+        BOOST_TEST(e == make_vector());
+
+        BOOST_STATIC_ASSERT(fusion::result_of::size<adapted::empty_adt>::value == 0);
+        BOOST_MPL_ASSERT((fusion::result_of::empty<adapted::empty_adt>));
+
+        BOOST_MPL_ASSERT((fusion::result_of::equal_to<
+            fusion::result_of::begin<adapted::empty_adt>::type,
+            fusion::result_of::end<adapted::empty_adt>::type>));
+    }
+
+    {
+        fusion::vector<> v;
+        adapted::empty_adt e(empty);
+        BOOST_TEST(v == e);
+        BOOST_TEST_NOT(e != v);
+        BOOST_TEST_NOT(v < e);
+        BOOST_TEST(v <= e);
+        BOOST_TEST_NOT(e > v);
+        BOOST_TEST(e >= v);
+    }
+
+    {
+        adapted::empty_adt e(empty);
+
+        // conversion from empty_adt to vector
+        fusion::vector<> v(e);
+        v = e;
+
+        // FIXME
+        // conversion from empty_adt to list
+        //fusion::list<> l(e);
+        //l = e;
+    }
+
+    BOOST_MPL_ASSERT((mpl::is_sequence<adapted::empty_adt>));
+    BOOST_MPL_ASSERT_NOT((fusion::result_of::has_key<adapted::empty_adt, void>));
+    BOOST_MPL_ASSERT_NOT((fusion::result_of::has_key<adapted::empty_adt, int>));
+
+    return boost::report_errors();
+}
+
diff --git a/test/sequence/adapt_assoc_struct_empty.cpp b/test/sequence/adapt_assoc_struct_empty.cpp
new file mode 100644
index 00000000..aa75f87a
--- /dev/null
+++ b/test/sequence/adapt_assoc_struct_empty.cpp
@@ -0,0 +1,88 @@
+/*=============================================================================
+    Copyright (c) 2016 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/fusion/adapted/struct/adapt_assoc_struct.hpp>
+#include <boost/fusion/sequence/intrinsic/size.hpp>
+#include <boost/fusion/sequence/intrinsic/empty.hpp>
+#include <boost/fusion/sequence/intrinsic/begin.hpp>
+#include <boost/fusion/sequence/intrinsic/end.hpp>
+#include <boost/fusion/sequence/io/out.hpp>
+#include <boost/fusion/iterator/equal_to.hpp>
+#include <boost/fusion/container/vector/vector.hpp>
+#include <boost/fusion/container/list/list.hpp>
+#include <boost/fusion/container/generation/make_vector.hpp>
+#include <boost/fusion/sequence/comparison/equal_to.hpp>
+#include <boost/fusion/sequence/comparison/not_equal_to.hpp>
+#include <boost/fusion/sequence/comparison/less.hpp>
+#include <boost/fusion/sequence/comparison/less_equal.hpp>
+#include <boost/fusion/sequence/comparison/greater.hpp>
+#include <boost/fusion/sequence/comparison/greater_equal.hpp>
+#include <boost/fusion/mpl.hpp>
+#include <boost/fusion/support/is_view.hpp>
+#include <boost/mpl/is_sequence.hpp>
+#include <boost/mpl/assert.hpp>
+#include <iostream>
+
+class empty_struct{};
+BOOST_FUSION_ADAPT_ASSOC_STRUCT(empty_struct,)
+
+int
+main()
+{
+    using namespace boost::fusion;
+    using namespace boost;
+
+    std::cout << tuple_open('[');
+    std::cout << tuple_close(']');
+    std::cout << tuple_delimiter(", ");
+
+    {
+        BOOST_MPL_ASSERT_NOT((traits::is_view<empty_struct>));
+        empty_struct e;
+
+        std::cout << e << std::endl;
+        BOOST_TEST(e == make_vector());
+
+        BOOST_STATIC_ASSERT(fusion::result_of::size<empty_struct>::value == 0);
+        BOOST_MPL_ASSERT((fusion::result_of::empty<empty_struct>));
+
+        BOOST_MPL_ASSERT((fusion::result_of::equal_to<
+            fusion::result_of::begin<empty_struct>::type,
+            fusion::result_of::end<empty_struct>::type>));
+    }
+
+    {
+        fusion::vector<> v;
+        empty_struct e;
+        BOOST_TEST(v <= e);
+        BOOST_TEST_NOT(e > v);
+        BOOST_TEST_NOT(v < e);
+        BOOST_TEST(v <= e);
+        BOOST_TEST_NOT(e > v);
+        BOOST_TEST(e >= v);
+    }
+
+    {
+        empty_struct e;
+
+        // conversion from empty_struct to vector
+        fusion::vector<> v(e);
+        v = e;
+
+        // FIXME
+        // conversion from empty_struct to list
+        //fusion::list<> l(e);
+        //l = e;
+    }
+
+    BOOST_MPL_ASSERT((mpl::is_sequence<empty_struct>));
+    BOOST_MPL_ASSERT_NOT((fusion::result_of::has_key<empty_struct, void>));
+    BOOST_MPL_ASSERT_NOT((fusion::result_of::has_key<empty_struct, int>));
+
+    return boost::report_errors();
+}
+
diff --git a/test/sequence/adapt_assoc_struct_named_empty.cpp b/test/sequence/adapt_assoc_struct_named_empty.cpp
new file mode 100644
index 00000000..a744d6a4
--- /dev/null
+++ b/test/sequence/adapt_assoc_struct_named_empty.cpp
@@ -0,0 +1,89 @@
+/*=============================================================================
+    Copyright (c) 2016 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/fusion/adapted/struct/adapt_assoc_struct_named.hpp>
+#include <boost/fusion/sequence/intrinsic/size.hpp>
+#include <boost/fusion/sequence/intrinsic/empty.hpp>
+#include <boost/fusion/sequence/intrinsic/begin.hpp>
+#include <boost/fusion/sequence/intrinsic/end.hpp>
+#include <boost/fusion/sequence/io/out.hpp>
+#include <boost/fusion/iterator/equal_to.hpp>
+#include <boost/fusion/container/vector/vector.hpp>
+#include <boost/fusion/container/list/list.hpp>
+#include <boost/fusion/container/generation/make_vector.hpp>
+#include <boost/fusion/sequence/comparison/equal_to.hpp>
+#include <boost/fusion/sequence/comparison/not_equal_to.hpp>
+#include <boost/fusion/sequence/comparison/less.hpp>
+#include <boost/fusion/sequence/comparison/less_equal.hpp>
+#include <boost/fusion/sequence/comparison/greater.hpp>
+#include <boost/fusion/sequence/comparison/greater_equal.hpp>
+#include <boost/fusion/mpl.hpp>
+#include <boost/fusion/support/is_view.hpp>
+#include <boost/mpl/is_sequence.hpp>
+#include <boost/mpl/assert.hpp>
+#include <iostream>
+
+class empty_struct{};
+BOOST_FUSION_ADAPT_ASSOC_STRUCT_NAMED(::empty_struct,empty_struct,)
+
+int
+main()
+{
+    using namespace boost::fusion;
+    using namespace boost;
+
+    std::cout << tuple_open('[');
+    std::cout << tuple_close(']');
+    std::cout << tuple_delimiter(", ");
+
+    empty_struct empty;
+    {
+        BOOST_MPL_ASSERT((traits::is_view<adapted::empty_struct>));
+        adapted::empty_struct e(empty);
+
+        std::cout << e << std::endl;
+        BOOST_TEST(e == make_vector());
+
+        BOOST_STATIC_ASSERT(fusion::result_of::size<adapted::empty_struct>::value == 0);
+        BOOST_MPL_ASSERT((fusion::result_of::empty<adapted::empty_struct>));
+
+        BOOST_MPL_ASSERT((fusion::result_of::equal_to<
+            fusion::result_of::begin<adapted::empty_struct>::type,
+            fusion::result_of::end<adapted::empty_struct>::type>));
+    }
+
+    {
+        fusion::vector<> v;
+        adapted::empty_struct e(empty);
+        BOOST_TEST(v <= e);
+        BOOST_TEST_NOT(e > v);
+        BOOST_TEST_NOT(v < e);
+        BOOST_TEST(v <= e);
+        BOOST_TEST_NOT(e > v);
+        BOOST_TEST(e >= v);
+    }
+
+    {
+        adapted::empty_struct e(empty);
+
+        // conversion from empty_struct to vector
+        fusion::vector<> v(e);
+        v = e;
+
+        // FIXME
+        // conversion from empty_struct to list
+        //fusion::list<> l(e);
+        //l = e;
+    }
+
+    BOOST_MPL_ASSERT((mpl::is_sequence<adapted::empty_struct>));
+    BOOST_MPL_ASSERT_NOT((fusion::result_of::has_key<adapted::empty_struct, void>));
+    BOOST_MPL_ASSERT_NOT((fusion::result_of::has_key<adapted::empty_struct, int>));
+
+    return boost::report_errors();
+}
+
diff --git a/test/sequence/adapt_assoc_tpl_adt_empty.cpp b/test/sequence/adapt_assoc_tpl_adt_empty.cpp
new file mode 100644
index 00000000..f38ba7ac
--- /dev/null
+++ b/test/sequence/adapt_assoc_tpl_adt_empty.cpp
@@ -0,0 +1,89 @@
+/*=============================================================================
+    Copyright (c) 2016 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/fusion/adapted/adt/adapt_assoc_adt.hpp>
+#include <boost/fusion/sequence/intrinsic/size.hpp>
+#include <boost/fusion/sequence/intrinsic/empty.hpp>
+#include <boost/fusion/sequence/intrinsic/begin.hpp>
+#include <boost/fusion/sequence/intrinsic/end.hpp>
+#include <boost/fusion/sequence/io/out.hpp>
+#include <boost/fusion/iterator/equal_to.hpp>
+#include <boost/fusion/container/vector/vector.hpp>
+#include <boost/fusion/container/list/list.hpp>
+#include <boost/fusion/container/generation/make_vector.hpp>
+#include <boost/fusion/sequence/comparison/equal_to.hpp>
+#include <boost/fusion/sequence/comparison/not_equal_to.hpp>
+#include <boost/fusion/sequence/comparison/less.hpp>
+#include <boost/fusion/sequence/comparison/less_equal.hpp>
+#include <boost/fusion/sequence/comparison/greater.hpp>
+#include <boost/fusion/sequence/comparison/greater_equal.hpp>
+#include <boost/fusion/mpl.hpp>
+#include <boost/fusion/support/is_view.hpp>
+#include <boost/mpl/is_sequence.hpp>
+#include <boost/mpl/assert.hpp>
+#include <iostream>
+
+template <typename T>
+class empty_adt{};
+BOOST_FUSION_ADAPT_ASSOC_TPL_ADT((T), (empty_adt)(T),)
+
+int
+main()
+{
+    using namespace boost::fusion;
+    using namespace boost;
+
+    std::cout << tuple_open('[');
+    std::cout << tuple_close(']');
+    std::cout << tuple_delimiter(", ");
+
+    {
+        BOOST_MPL_ASSERT_NOT((traits::is_view<empty_adt<void> >));
+        empty_adt<void> e;
+
+        std::cout << e << std::endl;
+        BOOST_TEST(e == make_vector());
+
+        BOOST_STATIC_ASSERT(fusion::result_of::size<empty_adt<void> >::value == 0);
+        BOOST_MPL_ASSERT((fusion::result_of::empty<empty_adt<void> >));
+
+        BOOST_MPL_ASSERT((fusion::result_of::equal_to<
+            fusion::result_of::begin<empty_adt<void> >::type,
+            fusion::result_of::end<empty_adt<void> >::type>));
+    }
+
+    {
+        fusion::vector<> v;
+        empty_adt<void>  e;
+        BOOST_TEST(v <= e);
+        BOOST_TEST_NOT(e > v);
+        BOOST_TEST_NOT(v < e);
+        BOOST_TEST(v <= e);
+        BOOST_TEST_NOT(e > v);
+        BOOST_TEST(e >= v);
+    }
+
+    {
+        empty_adt<void> e;
+
+        // conversion from empty_adt to vector
+        fusion::vector<> v(e);
+        v = e;
+
+        // FIXME
+        // conversion from empty_adt to list
+        //fusion::list<> l(e);
+        //l = e;
+    }
+
+    BOOST_MPL_ASSERT((mpl::is_sequence<empty_adt<void> >));
+    BOOST_MPL_ASSERT_NOT((fusion::result_of::has_key<empty_adt<void>, void>));
+    BOOST_MPL_ASSERT_NOT((fusion::result_of::has_key<empty_adt<void>, int>));
+
+    return boost::report_errors();
+}
+
diff --git a/test/sequence/adapt_assoc_tpl_struct_empty.cpp b/test/sequence/adapt_assoc_tpl_struct_empty.cpp
new file mode 100644
index 00000000..42795c41
--- /dev/null
+++ b/test/sequence/adapt_assoc_tpl_struct_empty.cpp
@@ -0,0 +1,89 @@
+/*=============================================================================
+    Copyright (c) 2016 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/fusion/adapted/struct/adapt_assoc_struct.hpp>
+#include <boost/fusion/sequence/intrinsic/size.hpp>
+#include <boost/fusion/sequence/intrinsic/empty.hpp>
+#include <boost/fusion/sequence/intrinsic/begin.hpp>
+#include <boost/fusion/sequence/intrinsic/end.hpp>
+#include <boost/fusion/sequence/io/out.hpp>
+#include <boost/fusion/iterator/equal_to.hpp>
+#include <boost/fusion/container/vector/vector.hpp>
+#include <boost/fusion/container/list/list.hpp>
+#include <boost/fusion/container/generation/make_vector.hpp>
+#include <boost/fusion/sequence/comparison/equal_to.hpp>
+#include <boost/fusion/sequence/comparison/not_equal_to.hpp>
+#include <boost/fusion/sequence/comparison/less.hpp>
+#include <boost/fusion/sequence/comparison/less_equal.hpp>
+#include <boost/fusion/sequence/comparison/greater.hpp>
+#include <boost/fusion/sequence/comparison/greater_equal.hpp>
+#include <boost/fusion/mpl.hpp>
+#include <boost/fusion/support/is_view.hpp>
+#include <boost/mpl/is_sequence.hpp>
+#include <boost/mpl/assert.hpp>
+#include <iostream>
+
+template <typename T>
+class empty_struct{};
+BOOST_FUSION_ADAPT_ASSOC_TPL_STRUCT((T), (empty_struct)(T),)
+
+int
+main()
+{
+    using namespace boost::fusion;
+    using namespace boost;
+
+    std::cout << tuple_open('[');
+    std::cout << tuple_close(']');
+    std::cout << tuple_delimiter(", ");
+
+    {
+        BOOST_MPL_ASSERT_NOT((traits::is_view<empty_struct<void> >));
+        empty_struct<void> e;
+
+        std::cout << e << std::endl;
+        BOOST_TEST(e == make_vector());
+
+        BOOST_STATIC_ASSERT(fusion::result_of::size<empty_struct<void> >::value == 0);
+        BOOST_MPL_ASSERT((fusion::result_of::empty<empty_struct<void> >));
+
+        BOOST_MPL_ASSERT((fusion::result_of::equal_to<
+            fusion::result_of::begin<empty_struct<void> >::type,
+            fusion::result_of::end<empty_struct<void> >::type>));
+    }
+
+    {
+        fusion::vector<> v;
+        empty_struct<void> e;
+        BOOST_TEST(v <= e);
+        BOOST_TEST_NOT(e > v);
+        BOOST_TEST_NOT(v < e);
+        BOOST_TEST(v <= e);
+        BOOST_TEST_NOT(e > v);
+        BOOST_TEST(e >= v);
+    }
+
+    {
+        empty_struct<void> e;
+
+        // conversion from empty_struct to vector
+        fusion::vector<> v(e);
+        v = e;
+
+        // FIXME
+        // conversion from empty_struct to list
+        //fusion::list<> l(e);
+        //l = e;
+    }
+
+    BOOST_MPL_ASSERT((mpl::is_sequence<empty_struct<void> >));
+    BOOST_MPL_ASSERT_NOT((fusion::result_of::has_key<empty_struct<void>, void>));
+    BOOST_MPL_ASSERT_NOT((fusion::result_of::has_key<empty_struct<void>, int>));
+
+    return boost::report_errors();
+}
+
diff --git a/test/sequence/adapt_struct_empty.cpp b/test/sequence/adapt_struct_empty.cpp
new file mode 100644
index 00000000..f08dc98d
--- /dev/null
+++ b/test/sequence/adapt_struct_empty.cpp
@@ -0,0 +1,86 @@
+/*=============================================================================
+    Copyright (c) 2016 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/fusion/adapted/struct/adapt_struct.hpp>
+#include <boost/fusion/sequence/intrinsic/size.hpp>
+#include <boost/fusion/sequence/intrinsic/empty.hpp>
+#include <boost/fusion/sequence/intrinsic/begin.hpp>
+#include <boost/fusion/sequence/intrinsic/end.hpp>
+#include <boost/fusion/sequence/io/out.hpp>
+#include <boost/fusion/iterator/equal_to.hpp>
+#include <boost/fusion/container/vector/vector.hpp>
+#include <boost/fusion/container/list/list.hpp>
+#include <boost/fusion/container/generation/make_vector.hpp>
+#include <boost/fusion/sequence/comparison/equal_to.hpp>
+#include <boost/fusion/sequence/comparison/not_equal_to.hpp>
+#include <boost/fusion/sequence/comparison/less.hpp>
+#include <boost/fusion/sequence/comparison/less_equal.hpp>
+#include <boost/fusion/sequence/comparison/greater.hpp>
+#include <boost/fusion/sequence/comparison/greater_equal.hpp>
+#include <boost/fusion/mpl.hpp>
+#include <boost/fusion/support/is_view.hpp>
+#include <boost/mpl/is_sequence.hpp>
+#include <boost/mpl/assert.hpp>
+#include <iostream>
+
+class empty_struct{};
+BOOST_FUSION_ADAPT_STRUCT(empty_struct,)
+
+int
+main()
+{
+    using namespace boost::fusion;
+    using namespace boost;
+
+    std::cout << tuple_open('[');
+    std::cout << tuple_close(']');
+    std::cout << tuple_delimiter(", ");
+
+    {
+        BOOST_MPL_ASSERT_NOT((traits::is_view<empty_struct>));
+        empty_struct e;
+
+        std::cout << e << std::endl;
+        BOOST_TEST(e == make_vector());
+
+        BOOST_STATIC_ASSERT(fusion::result_of::size<empty_struct>::value == 0);
+        BOOST_MPL_ASSERT((fusion::result_of::empty<empty_struct>));
+
+        BOOST_MPL_ASSERT((fusion::result_of::equal_to<
+            fusion::result_of::begin<empty_struct>::type,
+            fusion::result_of::end<empty_struct>::type>));
+    }
+
+    {
+        fusion::vector<> v;
+        empty_struct e;
+        BOOST_TEST(v == e);
+        BOOST_TEST_NOT(e != v);
+        BOOST_TEST_NOT(v < e);
+        BOOST_TEST(v <= e);
+        BOOST_TEST_NOT(e > v);
+        BOOST_TEST(e >= v);
+    }
+
+    {
+        empty_struct e;
+
+        // conversion from empty_struct to vector
+        fusion::vector<> v(e);
+        v = e;
+
+        // FIXME
+        // conversion from empty_struct to list
+        //fusion::list<> l(e);
+        //l = e;
+    }
+
+    BOOST_MPL_ASSERT((mpl::is_sequence<empty_struct>));
+
+    return boost::report_errors();
+}
+
diff --git a/test/sequence/adapt_struct_named_empty.cpp b/test/sequence/adapt_struct_named_empty.cpp
new file mode 100644
index 00000000..8333f130
--- /dev/null
+++ b/test/sequence/adapt_struct_named_empty.cpp
@@ -0,0 +1,87 @@
+/*=============================================================================
+    Copyright (c) 2016 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/fusion/adapted/struct/adapt_struct_named.hpp>
+#include <boost/fusion/sequence/intrinsic/size.hpp>
+#include <boost/fusion/sequence/intrinsic/empty.hpp>
+#include <boost/fusion/sequence/intrinsic/begin.hpp>
+#include <boost/fusion/sequence/intrinsic/end.hpp>
+#include <boost/fusion/sequence/io/out.hpp>
+#include <boost/fusion/iterator/equal_to.hpp>
+#include <boost/fusion/container/vector/vector.hpp>
+#include <boost/fusion/container/list/list.hpp>
+#include <boost/fusion/container/generation/make_vector.hpp>
+#include <boost/fusion/sequence/comparison/equal_to.hpp>
+#include <boost/fusion/sequence/comparison/not_equal_to.hpp>
+#include <boost/fusion/sequence/comparison/less.hpp>
+#include <boost/fusion/sequence/comparison/less_equal.hpp>
+#include <boost/fusion/sequence/comparison/greater.hpp>
+#include <boost/fusion/sequence/comparison/greater_equal.hpp>
+#include <boost/fusion/mpl.hpp>
+#include <boost/fusion/support/is_view.hpp>
+#include <boost/mpl/is_sequence.hpp>
+#include <boost/mpl/assert.hpp>
+#include <iostream>
+
+class empty_struct{};
+BOOST_FUSION_ADAPT_STRUCT_NAMED(::empty_struct,empty_struct,)
+
+int
+main()
+{
+    using namespace boost::fusion;
+    using namespace boost;
+
+    std::cout << tuple_open('[');
+    std::cout << tuple_close(']');
+    std::cout << tuple_delimiter(", ");
+
+    empty_struct empty;
+    {
+        BOOST_MPL_ASSERT((traits::is_view<adapted::empty_struct>));
+        adapted::empty_struct e(empty);
+
+        std::cout << e << std::endl;
+        BOOST_TEST(e == make_vector());
+
+        BOOST_STATIC_ASSERT(fusion::result_of::size<adapted::empty_struct>::value == 0);
+        BOOST_MPL_ASSERT((fusion::result_of::empty<adapted::empty_struct>));
+
+        BOOST_MPL_ASSERT((fusion::result_of::equal_to<
+            fusion::result_of::begin<adapted::empty_struct>::type,
+            fusion::result_of::end<adapted::empty_struct>::type>));
+    }
+
+    {
+        fusion::vector<> v;
+        adapted::empty_struct e(empty);
+        BOOST_TEST(v == e);
+        BOOST_TEST_NOT(e != v);
+        BOOST_TEST_NOT(v < e);
+        BOOST_TEST(v <= e);
+        BOOST_TEST_NOT(e > v);
+        BOOST_TEST(e >= v);
+    }
+
+    {
+        adapted::empty_struct e(empty);
+
+        // conversion from empty_struct to vector
+        fusion::vector<> v(e);
+        v = e;
+
+        // FIXME
+        // conversion from empty_struct to list
+        //fusion::list<> l(e);
+        //l = e;
+    }
+
+    BOOST_MPL_ASSERT((mpl::is_sequence<adapted::empty_struct>));
+
+    return boost::report_errors();
+}
+
diff --git a/test/sequence/adapt_tpl_adt_empty.cpp b/test/sequence/adapt_tpl_adt_empty.cpp
new file mode 100644
index 00000000..82bf2121
--- /dev/null
+++ b/test/sequence/adapt_tpl_adt_empty.cpp
@@ -0,0 +1,87 @@
+/*=============================================================================
+    Copyright (c) 2016 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/fusion/adapted/adt/adapt_adt.hpp>
+#include <boost/fusion/sequence/intrinsic/size.hpp>
+#include <boost/fusion/sequence/intrinsic/empty.hpp>
+#include <boost/fusion/sequence/intrinsic/begin.hpp>
+#include <boost/fusion/sequence/intrinsic/end.hpp>
+#include <boost/fusion/sequence/io/out.hpp>
+#include <boost/fusion/iterator/equal_to.hpp>
+#include <boost/fusion/container/vector/vector.hpp>
+#include <boost/fusion/container/list/list.hpp>
+#include <boost/fusion/container/generation/make_vector.hpp>
+#include <boost/fusion/sequence/comparison/equal_to.hpp>
+#include <boost/fusion/sequence/comparison/not_equal_to.hpp>
+#include <boost/fusion/sequence/comparison/less.hpp>
+#include <boost/fusion/sequence/comparison/less_equal.hpp>
+#include <boost/fusion/sequence/comparison/greater.hpp>
+#include <boost/fusion/sequence/comparison/greater_equal.hpp>
+#include <boost/fusion/mpl.hpp>
+#include <boost/fusion/support/is_view.hpp>
+#include <boost/mpl/is_sequence.hpp>
+#include <boost/mpl/assert.hpp>
+#include <iostream>
+
+template <typename T>
+class empty_adt{};
+BOOST_FUSION_ADAPT_TPL_ADT((T), (empty_adt)(T),)
+
+int
+main()
+{
+    using namespace boost::fusion;
+    using namespace boost;
+
+    std::cout << tuple_open('[');
+    std::cout << tuple_close(']');
+    std::cout << tuple_delimiter(", ");
+
+    {
+        BOOST_MPL_ASSERT_NOT((traits::is_view<empty_adt<void> >));
+        empty_adt<void> e;
+
+        std::cout << e << std::endl;
+        BOOST_TEST(e == make_vector());
+
+        BOOST_STATIC_ASSERT(fusion::result_of::size<empty_adt<void> >::value == 0);
+        BOOST_MPL_ASSERT((fusion::result_of::empty<empty_adt<void> >));
+
+        BOOST_MPL_ASSERT((fusion::result_of::equal_to<
+            fusion::result_of::begin<empty_adt<void> >::type,
+            fusion::result_of::end<empty_adt<void> >::type>));
+    }
+
+    {
+        fusion::vector<> v;
+        empty_adt<void> e;
+        BOOST_TEST(v == e);
+        BOOST_TEST_NOT(v != e);
+        BOOST_TEST_NOT(v < e);
+        BOOST_TEST(v <= e);
+        BOOST_TEST_NOT(e > v);
+        BOOST_TEST(e >= v);
+    }
+
+    {
+        empty_adt<void> e;
+
+        // conversion from empty_adt to vector
+        fusion::vector<> v(e);
+        v = e;
+
+        // FIXME
+        // conversion from empty_adt to list
+        //fusion::list<> l(e);
+        //l = e;
+    }
+
+    BOOST_MPL_ASSERT((mpl::is_sequence<empty_adt<void> >));
+
+    return boost::report_errors();
+}
+
diff --git a/test/sequence/adapt_tpl_struct_empty.cpp b/test/sequence/adapt_tpl_struct_empty.cpp
new file mode 100644
index 00000000..5cb1d442
--- /dev/null
+++ b/test/sequence/adapt_tpl_struct_empty.cpp
@@ -0,0 +1,87 @@
+/*=============================================================================
+    Copyright (c) 2016 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/fusion/adapted/struct/adapt_struct.hpp>
+#include <boost/fusion/sequence/intrinsic/size.hpp>
+#include <boost/fusion/sequence/intrinsic/empty.hpp>
+#include <boost/fusion/sequence/intrinsic/begin.hpp>
+#include <boost/fusion/sequence/intrinsic/end.hpp>
+#include <boost/fusion/sequence/io/out.hpp>
+#include <boost/fusion/iterator/equal_to.hpp>
+#include <boost/fusion/container/vector/vector.hpp>
+#include <boost/fusion/container/list/list.hpp>
+#include <boost/fusion/container/generation/make_vector.hpp>
+#include <boost/fusion/sequence/comparison/equal_to.hpp>
+#include <boost/fusion/sequence/comparison/not_equal_to.hpp>
+#include <boost/fusion/sequence/comparison/less.hpp>
+#include <boost/fusion/sequence/comparison/less_equal.hpp>
+#include <boost/fusion/sequence/comparison/greater.hpp>
+#include <boost/fusion/sequence/comparison/greater_equal.hpp>
+#include <boost/fusion/mpl.hpp>
+#include <boost/fusion/support/is_view.hpp>
+#include <boost/mpl/is_sequence.hpp>
+#include <boost/mpl/assert.hpp>
+#include <iostream>
+
+template <typename T>
+class empty_struct{};
+BOOST_FUSION_ADAPT_TPL_STRUCT((T), (empty_struct)(T),)
+
+int
+main()
+{
+    using namespace boost::fusion;
+    using namespace boost;
+
+    std::cout << tuple_open('[');
+    std::cout << tuple_close(']');
+    std::cout << tuple_delimiter(", ");
+
+    {
+        BOOST_MPL_ASSERT_NOT((traits::is_view<empty_struct<void> >));
+        empty_struct<void> e;
+
+        std::cout << e << std::endl;
+        BOOST_TEST(e == make_vector());
+
+        BOOST_STATIC_ASSERT(fusion::result_of::size<empty_struct<void> >::value == 0);
+        BOOST_MPL_ASSERT((fusion::result_of::empty<empty_struct<void> >));
+
+        BOOST_MPL_ASSERT((fusion::result_of::equal_to<
+            fusion::result_of::begin<empty_struct<void> >::type,
+            fusion::result_of::end<empty_struct<void> >::type>));
+    }
+
+    {
+        fusion::vector<> v;
+        empty_struct<void> e;
+        BOOST_TEST(v == e);
+        BOOST_TEST_NOT(v != e);
+        BOOST_TEST_NOT(v < e);
+        BOOST_TEST(v <= e);
+        BOOST_TEST_NOT(v > e);
+        BOOST_TEST(v >= e);
+    }
+
+    {
+        empty_struct<void> e;
+
+        // conversion from empty_struct to vector
+        fusion::vector<> v(e);
+        v = e;
+
+        // FIXME
+        // conversion from empty_struct to list
+        //fusion::list<> l(e);
+        //l = e;
+    }
+
+    BOOST_MPL_ASSERT((mpl::is_sequence<empty_struct<void> >));
+
+    return boost::report_errors();
+}
+
diff --git a/test/sequence/define_assoc_struct_empty.cpp b/test/sequence/define_assoc_struct_empty.cpp
new file mode 100644
index 00000000..204eda8e
--- /dev/null
+++ b/test/sequence/define_assoc_struct_empty.cpp
@@ -0,0 +1,77 @@
+/*=============================================================================
+    Copyright (c) 2016 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/fusion/container.hpp>
+#include <boost/fusion/sequence.hpp>
+#include <boost/fusion/sequence/io/out.hpp>
+#include <boost/fusion/iterator/equal_to.hpp>
+#include <boost/fusion/adapted/struct/define_assoc_struct.hpp>
+#include <boost/mpl/assert.hpp>
+#include <boost/mpl/is_sequence.hpp>
+#include <boost/static_assert.hpp>
+#include <iostream>
+
+BOOST_FUSION_DEFINE_ASSOC_STRUCT(BOOST_PP_EMPTY(), empty_struct, )
+
+int
+main()
+{
+    using namespace boost;
+    using namespace boost::fusion;
+
+    std::cout << tuple_open('[');
+    std::cout << tuple_close(']');
+    std::cout << tuple_delimiter(", ");
+
+    {
+        BOOST_MPL_ASSERT_NOT((traits::is_view<empty_struct>));
+        empty_struct e;
+
+        std::cout << e << std::endl;
+        BOOST_TEST(e == make_vector());
+
+        BOOST_STATIC_ASSERT(fusion::result_of::size<empty_struct>::value == 0);
+        BOOST_STATIC_ASSERT(fusion::result_of::empty<empty_struct>::value);
+    }
+
+    {
+        vector<> v;
+        empty_struct e;
+        BOOST_TEST(v == e);
+        BOOST_TEST_NOT(v != e);
+        BOOST_TEST_NOT(v < e);
+        BOOST_TEST(v <= e);
+        BOOST_TEST_NOT(v > e);
+        BOOST_TEST(v >= e);
+    }
+
+    {
+        empty_struct e;
+
+        // conversion from empty_struct to vector
+        vector<> v(e);
+        v = e;
+
+        // conversion from empty_struct to list
+        //list<> l(e);
+        //l = e;
+    }
+
+    { // begin/end
+        typedef fusion::result_of::begin<empty_struct>::type b;
+        typedef fusion::result_of::end<empty_struct>::type e;
+
+        BOOST_MPL_ASSERT((fusion::result_of::equal_to<b, e>));
+    }
+
+    BOOST_MPL_ASSERT((mpl::is_sequence<empty_struct>));
+    BOOST_MPL_ASSERT_NOT((fusion::result_of::has_key<empty_struct, void>));
+    BOOST_MPL_ASSERT_NOT((fusion::result_of::has_key<empty_struct, int>));
+
+    return boost::report_errors();
+}
diff --git a/test/sequence/define_assoc_tpl_struct_empty.cpp b/test/sequence/define_assoc_tpl_struct_empty.cpp
new file mode 100644
index 00000000..fc4ebd7f
--- /dev/null
+++ b/test/sequence/define_assoc_tpl_struct_empty.cpp
@@ -0,0 +1,77 @@
+/*=============================================================================
+    Copyright (c) 2016 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/fusion/container.hpp>
+#include <boost/fusion/sequence.hpp>
+#include <boost/fusion/sequence/io/out.hpp>
+#include <boost/fusion/iterator/equal_to.hpp>
+#include <boost/fusion/adapted/struct/define_assoc_struct.hpp>
+#include <boost/mpl/assert.hpp>
+#include <boost/mpl/is_sequence.hpp>
+#include <boost/static_assert.hpp>
+#include <iostream>
+
+BOOST_FUSION_DEFINE_ASSOC_TPL_STRUCT((M), BOOST_PP_EMPTY(), empty_struct, )
+
+int
+main()
+{
+    using namespace boost;
+    using namespace boost::fusion;
+
+    std::cout << tuple_open('[');
+    std::cout << tuple_close(']');
+    std::cout << tuple_delimiter(", ");
+
+    {
+        BOOST_MPL_ASSERT_NOT((traits::is_view<empty_struct<void> >));
+        empty_struct<void> e;
+
+        std::cout << e << std::endl;
+        BOOST_TEST(e == make_vector());
+
+        BOOST_STATIC_ASSERT(fusion::result_of::size<empty_struct<void> >::value == 0);
+        BOOST_STATIC_ASSERT(fusion::result_of::empty<empty_struct<void> >::value);
+    }
+
+    {
+        vector<> v;
+        empty_struct<void> e;
+        BOOST_TEST(v == e);
+        BOOST_TEST_NOT(v != e);
+        BOOST_TEST_NOT(v < e);
+        BOOST_TEST(v <= e);
+        BOOST_TEST_NOT(v > e);
+        BOOST_TEST(v >= e);
+    }
+
+    {
+        empty_struct<void> e;
+
+        // conversion from empty_struct to vector
+        vector<> v(e);
+        v = e;
+
+        // conversion from empty_struct to list
+        //list<> l(e);
+        //l = e;
+    }
+
+    { // begin/end
+        typedef fusion::result_of::begin<empty_struct<void> >::type b;
+        typedef fusion::result_of::end<empty_struct<void> >::type e;
+
+        BOOST_MPL_ASSERT((fusion::result_of::equal_to<b, e>));
+    }
+
+    BOOST_MPL_ASSERT((mpl::is_sequence<empty_struct<void> >));
+    BOOST_MPL_ASSERT_NOT((fusion::result_of::has_key<empty_struct<void>, void>));
+    BOOST_MPL_ASSERT_NOT((fusion::result_of::has_key<empty_struct<void>, int>));
+
+    return boost::report_errors();
+}
diff --git a/test/sequence/define_struct_empty.cpp b/test/sequence/define_struct_empty.cpp
new file mode 100644
index 00000000..893ed436
--- /dev/null
+++ b/test/sequence/define_struct_empty.cpp
@@ -0,0 +1,75 @@
+/*=============================================================================
+    Copyright (c) 2016 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/fusion/container.hpp>
+#include <boost/fusion/sequence.hpp>
+#include <boost/fusion/sequence/io/out.hpp>
+#include <boost/fusion/iterator/equal_to.hpp>
+#include <boost/fusion/adapted/struct/define_struct.hpp>
+#include <boost/mpl/assert.hpp>
+#include <boost/mpl/is_sequence.hpp>
+#include <boost/static_assert.hpp>
+#include <iostream>
+
+BOOST_FUSION_DEFINE_STRUCT(BOOST_PP_EMPTY(), empty_struct, )
+
+int
+main()
+{
+    using namespace boost;
+    using namespace boost::fusion;
+
+    std::cout << tuple_open('[');
+    std::cout << tuple_close(']');
+    std::cout << tuple_delimiter(", ");
+
+    {
+        BOOST_MPL_ASSERT_NOT((traits::is_view<empty_struct>));
+        empty_struct e;
+
+        std::cout << e << std::endl;
+        BOOST_TEST(e == make_vector());
+
+        BOOST_STATIC_ASSERT(fusion::result_of::size<empty_struct>::value == 0);
+        BOOST_STATIC_ASSERT(fusion::result_of::empty<empty_struct>::value);
+    }
+
+    {
+        vector<> v;
+        empty_struct e;
+        BOOST_TEST(v == e);
+        BOOST_TEST_NOT(v != e);
+        BOOST_TEST_NOT(v < e);
+        BOOST_TEST(v <= e);
+        BOOST_TEST_NOT(v > e);
+        BOOST_TEST(v >= e);
+    }
+
+    {
+        empty_struct e;
+
+        // conversion from empty_struct to vector
+        vector<> v(e);
+        v = e;
+
+        // conversion from empty_struct to list
+        //list<> l(e);
+        //l = e;
+    }
+
+    { // begin/end
+        typedef fusion::result_of::begin<empty_struct>::type b;
+        typedef fusion::result_of::end<empty_struct>::type e;
+
+        BOOST_MPL_ASSERT((fusion::result_of::equal_to<b, e>));
+    }
+
+    BOOST_MPL_ASSERT((mpl::is_sequence<empty_struct>));
+
+    return boost::report_errors();
+}
diff --git a/test/sequence/define_struct_inline_empty.cpp b/test/sequence/define_struct_inline_empty.cpp
new file mode 100644
index 00000000..4524da1b
--- /dev/null
+++ b/test/sequence/define_struct_inline_empty.cpp
@@ -0,0 +1,75 @@
+/*=============================================================================
+    Copyright (c) 2016 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/fusion/container.hpp>
+#include <boost/fusion/sequence.hpp>
+#include <boost/fusion/sequence/io/out.hpp>
+#include <boost/fusion/iterator/equal_to.hpp>
+#include <boost/fusion/adapted/struct/define_struct_inline.hpp>
+#include <boost/mpl/assert.hpp>
+#include <boost/mpl/is_sequence.hpp>
+#include <boost/static_assert.hpp>
+#include <iostream>
+
+BOOST_FUSION_DEFINE_STRUCT_INLINE(empty_struct, )
+
+int
+main()
+{
+    using namespace boost;
+    using namespace boost::fusion;
+
+    std::cout << tuple_open('[');
+    std::cout << tuple_close(']');
+    std::cout << tuple_delimiter(", ");
+
+    {
+        BOOST_MPL_ASSERT_NOT((traits::is_view<empty_struct>));
+        empty_struct e;
+
+        std::cout << e << std::endl;
+        BOOST_TEST(e == make_vector());
+
+        BOOST_STATIC_ASSERT(fusion::result_of::size<empty_struct>::value == 0);
+        BOOST_STATIC_ASSERT(fusion::result_of::empty<empty_struct>::value);
+    }
+
+    {
+        vector<> v;
+        empty_struct e;
+        BOOST_TEST(v == e);
+        BOOST_TEST_NOT(v != e);
+        BOOST_TEST_NOT(v < e);
+        BOOST_TEST(v <= e);
+        BOOST_TEST_NOT(v > e);
+        BOOST_TEST(v >= e);
+    }
+
+    {
+        empty_struct e;
+
+        // conversion from empty_struct to vector
+        vector<> v(e);
+        v = e;
+
+        // conversion from empty_struct to list
+        //list<> l(e);
+        //l = e;
+    }
+
+    { // begin/end
+        typedef fusion::result_of::begin<empty_struct>::type b;
+        typedef fusion::result_of::end<empty_struct>::type e;
+
+        BOOST_MPL_ASSERT((fusion::result_of::equal_to<b, e>));
+    }
+
+    BOOST_MPL_ASSERT((mpl::is_sequence<empty_struct>));
+
+    return boost::report_errors();
+}
diff --git a/test/sequence/define_tpl_struct_empty.cpp b/test/sequence/define_tpl_struct_empty.cpp
new file mode 100644
index 00000000..d8cf47de
--- /dev/null
+++ b/test/sequence/define_tpl_struct_empty.cpp
@@ -0,0 +1,75 @@
+/*=============================================================================
+    Copyright (c) 2016 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/fusion/container.hpp>
+#include <boost/fusion/sequence.hpp>
+#include <boost/fusion/sequence/io/out.hpp>
+#include <boost/fusion/iterator/equal_to.hpp>
+#include <boost/fusion/adapted/struct/define_struct.hpp>
+#include <boost/mpl/assert.hpp>
+#include <boost/mpl/is_sequence.hpp>
+#include <boost/static_assert.hpp>
+#include <iostream>
+
+BOOST_FUSION_DEFINE_TPL_STRUCT((M), BOOST_PP_EMPTY(), empty_struct, )
+
+int
+main()
+{
+    using namespace boost;
+    using namespace boost::fusion;
+
+    std::cout << tuple_open('[');
+    std::cout << tuple_close(']');
+    std::cout << tuple_delimiter(", ");
+
+    {
+        BOOST_MPL_ASSERT_NOT((traits::is_view<empty_struct<void> >));
+        empty_struct<void>  e;
+
+        std::cout << e << std::endl;
+        BOOST_TEST(e == make_vector());
+
+        BOOST_STATIC_ASSERT(fusion::result_of::size<empty_struct<void> >::value == 0);
+        BOOST_STATIC_ASSERT(fusion::result_of::empty<empty_struct<void> >::value);
+    }
+
+    {
+        vector<> v;
+        empty_struct<void>  e;
+        BOOST_TEST(v == e);
+        BOOST_TEST_NOT(v != e);
+        BOOST_TEST_NOT(v < e);
+        BOOST_TEST(v <= e);
+        BOOST_TEST_NOT(v > e);
+        BOOST_TEST(v >= e);
+    }
+
+    {
+        empty_struct<void>  e;
+
+        // conversion from empty_struct to vector
+        vector<> v(e);
+        v = e;
+
+        // conversion from empty_struct to list
+        //list<> l(e);
+        //l = e;
+    }
+
+    { // begin/end
+        typedef fusion::result_of::begin<empty_struct<void> >::type b;
+        typedef fusion::result_of::end<empty_struct<void> >::type e;
+
+        BOOST_MPL_ASSERT((fusion::result_of::equal_to<b, e>));
+    }
+
+    BOOST_MPL_ASSERT((mpl::is_sequence<empty_struct<void> >));
+
+    return boost::report_errors();
+}
diff --git a/test/sequence/define_tpl_struct_inline_empty.cpp b/test/sequence/define_tpl_struct_inline_empty.cpp
new file mode 100644
index 00000000..5cc0163f
--- /dev/null
+++ b/test/sequence/define_tpl_struct_inline_empty.cpp
@@ -0,0 +1,75 @@
+/*=============================================================================
+    Copyright (c) 2016 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/fusion/container.hpp>
+#include <boost/fusion/sequence.hpp>
+#include <boost/fusion/sequence/io/out.hpp>
+#include <boost/fusion/iterator/equal_to.hpp>
+#include <boost/fusion/adapted/struct/define_struct_inline.hpp>
+#include <boost/mpl/assert.hpp>
+#include <boost/mpl/is_sequence.hpp>
+#include <boost/static_assert.hpp>
+#include <iostream>
+
+BOOST_FUSION_DEFINE_TPL_STRUCT_INLINE((M), empty_struct, )
+
+int
+main()
+{
+    using namespace boost;
+    using namespace boost::fusion;
+
+    std::cout << tuple_open('[');
+    std::cout << tuple_close(']');
+    std::cout << tuple_delimiter(", ");
+
+    {
+        BOOST_MPL_ASSERT_NOT((traits::is_view<empty_struct<void> >));
+        empty_struct<void>  e;
+
+        std::cout << e << std::endl;
+        BOOST_TEST(e == make_vector());
+
+        BOOST_STATIC_ASSERT(fusion::result_of::size<empty_struct<void> >::value == 0);
+        BOOST_STATIC_ASSERT(fusion::result_of::empty<empty_struct<void> >::value);
+    }
+
+    {
+        vector<> v;
+        empty_struct<void>  e;
+        BOOST_TEST(v == e);
+        BOOST_TEST_NOT(v != e);
+        BOOST_TEST_NOT(v < e);
+        BOOST_TEST(v <= e);
+        BOOST_TEST_NOT(v > e);
+        BOOST_TEST(v >= e);
+    }
+
+    {
+        empty_struct<void>  e;
+
+        // conversion from empty_struct to vector
+        vector<> v(e);
+        v = e;
+
+        // conversion from empty_struct to list
+        //list<> l(e);
+        //l = e;
+    }
+
+    { // begin/end
+        typedef fusion::result_of::begin<empty_struct<void> >::type b;
+        typedef fusion::result_of::end<empty_struct<void> >::type e;
+
+        BOOST_MPL_ASSERT((fusion::result_of::equal_to<b, e>));
+    }
+
+    BOOST_MPL_ASSERT((mpl::is_sequence<empty_struct<void> >));
+
+    return boost::report_errors();
+}