17 using ref = boost::yap::expression_ref<boost::yap::expression, T>;  typedef
46             bh::tuple<ref<term<double> &>, term<int>>>;  in test_main()
51             ref<term<double> &> ref = bh::front(plus_expr.elements);  in test_main()  local
53                               decltype(yap::deref(std::move(ref))),  in test_main()
55             BOOST_CHECK(yap::value(ref) == 1.0);  in test_main()
59             ref<term<double> &> ref = bh::front(plus_expr.elements);  in test_main()  local
61                 (std::is_same<decltype(yap::deref(ref)), term<double> &>));  in test_main()
62             BOOST_CHECK(yap::value(ref) == 1.0);  in test_main()
66             ref<term<double> &> const ref = bh::front(plus_expr.elements);  in test_main()  local
68                 (std::is_same<decltype(yap::deref(ref)), term<double> &>));  in test_main()
69             BOOST_CHECK(yap::value(ref) == 1.0);  in test_main()
76                 bh::tuple<ref<term<double> const &>, term<int>>>  in test_main()
80                 ref<term<double> const &> ref = bh::front(plus_expr.elements);  in test_main()  local
82                                   decltype(yap::deref(std::move(ref))),  in test_main()
84                 BOOST_CHECK(yap::value(ref) == 1.0);  in test_main()
88                 ref<term<double> const &> ref = bh::front(plus_expr.elements);  in test_main()  local
90                                   decltype(yap::deref(ref)),  in test_main()
92                 BOOST_CHECK(yap::value(ref) == 1.0);  in test_main()
96                 ref<term<double> const &> const ref =  in test_main()  local
99                                   decltype(yap::deref(ref)),  in test_main()
101                 BOOST_CHECK(yap::value(ref) == 1.0);  in test_main()
115             user_ref<user_term<double> &> ref = bh::front(plus_expr.elements);  in test_main()  local
117                               decltype(yap::deref(std::move(ref))),  in test_main()
119             BOOST_CHECK(yap::value(ref) == 1.0);  in test_main()
123             user_ref<user_term<double> &> ref = bh::front(plus_expr.elements);  in test_main()  local
125                 (std::is_same<decltype(yap::deref(ref)), user_term<double> &>));  in test_main()
126             BOOST_CHECK(yap::value(ref) == 1.0);  in test_main()
130             user_ref<user_term<double> &> const ref =  in test_main()  local
133                 (std::is_same<decltype(yap::deref(ref)), user_term<double> &>));  in test_main()
134             BOOST_CHECK(yap::value(ref) == 1.0);  in test_main()
145                 user_ref<user_term<double> const &> ref =  in test_main()  local
148                                   decltype(yap::deref(std::move(ref))),  in test_main()
150                 BOOST_CHECK(yap::value(ref) == 1.0);  in test_main()
154                 user_ref<user_term<double> const &> ref =  in test_main()  local
157                                   decltype(yap::deref(ref)),  in test_main()
159                 BOOST_CHECK(yap::value(ref) == 1.0);  in test_main()
163                 user_ref<user_term<double> const &> const ref =  in test_main()  local
166                                   decltype(yap::deref(ref)),  in test_main()
168                 BOOST_CHECK(yap::value(ref) == 1.0);  in test_main()