| 1 | /////////////////////////////////////////////////////////////////////////////// |
| 2 | // bug2407.hpp |
| 3 | // |
| 4 | // Copyright 2008 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 <iostream> |
| 9 | #include <boost/proto/proto.hpp> |
| 10 | |
| 11 | namespace mpl = boost::mpl; |
| 12 | namespace proto = boost::proto; |
| 13 | using proto::_; |
| 14 | |
| 15 | template<class E> |
| 16 | struct e; |
| 17 | |
| 18 | struct g |
| 19 | : proto::or_< |
| 20 | proto::terminal<int> |
| 21 | , proto::plus<g,g> |
| 22 | > |
| 23 | {}; |
| 24 | |
| 25 | struct d |
| 26 | : proto::domain<proto::generator<e>, g> |
| 27 | {}; |
| 28 | |
| 29 | template<class E> |
| 30 | struct e |
| 31 | : proto::extends<E, e<E>, d> |
| 32 | { |
| 33 | BOOST_MPL_ASSERT((proto::matches<E, g>)); |
| 34 | |
| 35 | e(E const &x = E()) |
| 36 | : proto::extends<E, e<E>, d>(x) |
| 37 | {} |
| 38 | }; |
| 39 | |
| 40 | e<proto::terminal<int>::type> i; |
| 41 | |
| 42 | template<class E> |
| 43 | std::ostream &operator<<(std::ostream &sout, e<E> const &x) |
| 44 | { |
| 45 | return sout; |
| 46 | } |
| 47 | |
| 48 | int main() |
| 49 | { |
| 50 | std::cout << (i+i); |
| 51 | } |
| 52 | |