| 1 | /////////////////////////////////////////////////////////////////////////////// |
|---|---|
| 2 | // mpl.hpp |
| 3 | // |
| 4 | // Copyright 2012 Eric Niebler. Distributed under the Boost |
| 5 | // Software License, Version 1.0. (See accompanying file |
| 6 | // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
| 7 | |
| 8 | #include <boost/proto/proto.hpp> |
| 9 | #include <boost/fusion/mpl.hpp> |
| 10 | #include <boost/mpl/pop_back.hpp> |
| 11 | #include <boost/type_traits/is_same.hpp> |
| 12 | #include <boost/static_assert.hpp> |
| 13 | #include <boost/test/unit_test.hpp> |
| 14 | namespace mpl = boost::mpl; |
| 15 | namespace proto = boost::proto; |
| 16 | namespace fusion = boost::fusion; |
| 17 | using proto::_; |
| 18 | |
| 19 | template<class E> |
| 20 | struct my_expr; |
| 21 | |
| 22 | struct my_domain |
| 23 | : proto::domain<proto::generator<my_expr> > |
| 24 | {}; |
| 25 | |
| 26 | template<class E> |
| 27 | struct my_expr |
| 28 | : proto::extends<E, my_expr<E>, my_domain> |
| 29 | { |
| 30 | my_expr(E const &e = E()) |
| 31 | : proto::extends<E, my_expr<E>, my_domain>(e) |
| 32 | {} |
| 33 | |
| 34 | typedef fusion::fusion_sequence_tag tag; |
| 35 | }; |
| 36 | |
| 37 | template<typename T> |
| 38 | void test_impl(T const &) |
| 39 | { |
| 40 | typedef typename mpl::pop_back<T>::type result_type; |
| 41 | BOOST_STATIC_ASSERT( |
| 42 | (boost::is_same< |
| 43 | result_type |
| 44 | , my_expr<proto::basic_expr<proto::tag::plus, proto::list1<my_expr<proto::terminal<int>::type>&> > > |
| 45 | >::value) |
| 46 | ); |
| 47 | } |
| 48 | |
| 49 | // Test that we can call mpl algorithms on proto expression types, and get proto expression types back |
| 50 | void test_mpl() |
| 51 | { |
| 52 | my_expr<proto::terminal<int>::type> i; |
| 53 | test_impl(i + i); |
| 54 | } |
| 55 | |
| 56 | using namespace boost::unit_test; |
| 57 | /////////////////////////////////////////////////////////////////////////////// |
| 58 | // init_unit_test_suite |
| 59 | // |
| 60 | test_suite* init_unit_test_suite( int argc, char* argv[] ) |
| 61 | { |
| 62 | test_suite *test = BOOST_TEST_SUITE("test proto mpl integration via fusion"); |
| 63 | |
| 64 | test->add(BOOST_TEST_CASE(&test_mpl)); |
| 65 | |
| 66 | return test; |
| 67 | } |
| 68 |