| 1 | // Boost.TypeErasure library |
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| 2 | // |
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| 3 | // Copyright 2011 Steven Watanabe |
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| 4 | // |
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| 5 | // Distributed under the Boost Software License Version 1.0. (See |
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| 6 | // accompanying file LICENSE_1_0.txt or copy at |
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| 7 | // http://www.boost.org/LICENSE_1_0.txt) |
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| 8 | // |
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| 9 | // $Id$ |
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| 10 | |
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| 11 | #include <boost/type_erasure/any.hpp> |
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| 12 | #include <boost/type_erasure/builtin.hpp> |
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| 13 | #include <boost/mpl/vector.hpp> |
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| 14 | #include <boost/mpl/assert.hpp> |
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| 15 | #include <boost/type_traits/is_same.hpp> |
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| 16 | |
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| 17 | using namespace boost::type_erasure; |
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| 18 | namespace mpl = boost::mpl; |
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| 19 | |
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| 20 | template<class T = _self> |
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| 21 | struct common : mpl::vector< |
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| 22 | copy_constructible<T> |
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| 23 | > {}; |
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| 24 | |
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| 25 | template<class T = _self> |
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| 26 | struct concept1 : mpl::vector<copy_constructible<T> > {}; |
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| 27 | |
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| 28 | template<class T = _self> |
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| 29 | struct concept2 : mpl::vector<concept1<T> > {}; |
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| 30 | |
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| 31 | namespace boost { |
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| 32 | namespace type_erasure { |
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| 33 | |
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| 34 | template<class T, class Base> |
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| 35 | struct concept_interface<concept1<T>, Base, T> : Base |
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| 36 | { |
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| 37 | typedef int id_type; |
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| 38 | }; |
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| 39 | |
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| 40 | template<class T, class Base> |
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| 41 | struct concept_interface<concept2<T>, Base, T> : Base |
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| 42 | { |
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| 43 | typedef char id_type; |
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| 44 | }; |
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| 45 | |
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| 46 | } |
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| 47 | } |
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| 48 | |
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| 49 | BOOST_MPL_ASSERT((boost::is_same<any<concept2<> >::id_type, char>)); |
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| 50 | BOOST_MPL_ASSERT((boost::is_same<any<mpl::vector<concept2<>, concept1<> > >::id_type, char>)); |
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| 51 | BOOST_MPL_ASSERT((boost::is_same<any<mpl::vector<concept1<>, concept2<> > >::id_type, char>)); |
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| 52 | |
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