| 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 | #ifndef BOOST_TYPE_ERASURE_DERIVED_HPP_INCLUDED |
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| 12 | #define BOOST_TYPE_ERASURE_DERIVED_HPP_INCLUDED |
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| 13 | |
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| 14 | namespace boost { |
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| 15 | namespace type_erasure { |
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| 16 | |
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| 17 | /** |
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| 18 | * A metafunction which returns the full @ref any type, |
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| 19 | * when given any of its base classes. This is primarily |
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| 20 | * intended to be used when implementing @ref concept_interface. |
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| 21 | * |
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| 22 | * \see rebind_any, as_param |
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| 23 | */ |
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| 24 | template<class T> |
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| 25 | struct derived |
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| 26 | { |
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| 27 | #ifdef BOOST_TYPE_ERASURE_DOXYGEN |
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| 28 | typedef detail::unspecified type; |
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| 29 | #else |
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| 30 | typedef typename T::_boost_type_erasure_derived_type type; |
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| 31 | #endif |
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| 32 | }; |
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| 33 | |
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| 34 | #ifndef BOOST_NO_CXX11_TEMPLATE_ALIASES |
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| 35 | |
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| 36 | template<class T> |
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| 37 | using derived_t = typename T::_boost_type_erasure_derived_type; |
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| 38 | |
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| 39 | #endif |
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| 40 | |
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| 41 | } |
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| 42 | } |
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| 43 | |
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| 44 | #endif |
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| 45 | |
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