18 struct X2 {};  struct
34         using L2 = mp_list<X1, X2>;  in main()
36         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_replace_front<L2, void>, mp_list<void, X2>>));  in main()
37         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_replace_first<L2, void>, mp_list<void, X2>>));  in main()
39         using L3 = mp_list<X1, X2, X3>;  in main()
41         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_replace_front<L3, void>, mp_list<void, X2, X3>>));  in main()
42         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_replace_first<L3, void>, mp_list<void, X2, X3>>));  in main()
44         using L4 = mp_list<X1, X2, X3, X4>;  in main()
46 …      BOOST_TEST_TRAIT_TRUE((std::is_same<mp_replace_front<L4, void>, mp_list<void, X2, X3, X4>>));  in main()
47 …      BOOST_TEST_TRAIT_TRUE((std::is_same<mp_replace_first<L4, void>, mp_list<void, X2, X3, X4>>));  in main()
56         using L2 = std::tuple<X1, X2>;  in main()
58         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_replace_front<L2, void>, std::tuple<void, X2>>));  in main()
59         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_replace_first<L2, void>, std::tuple<void, X2>>));  in main()
61         using L3 = std::tuple<X1, X2, X3>;  in main()
63         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_replace_front<L3, void>, std::tuple<void, X2, X3>>));  in main()
64         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_replace_first<L3, void>, std::tuple<void, X2, X3>>));  in main()
66         using L4 = std::tuple<X1, X2, X3, X4>;  in main()
68 …   BOOST_TEST_TRAIT_TRUE((std::is_same<mp_replace_front<L4, void>, std::tuple<void, X2, X3, X4>>));  in main()
69 …   BOOST_TEST_TRAIT_TRUE((std::is_same<mp_replace_first<L4, void>, std::tuple<void, X2, X3, X4>>));  in main()
73         using L2 = std::pair<X1, X2>;  in main()
75         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_replace_front<L2, void>, std::pair<void, X2>>));  in main()
76         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_replace_first<L2, void>, std::pair<void, X2>>));  in main()