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// Boost.TypeErasure library
//
// Copyright 2011 Steven Watanabe
//
// Distributed under the Boost Software License Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
// $Id$
#ifndef BOOST_TYPE_ERASURE_CONCEPT_INTERFACE_HPP_INCLUDED
#define BOOST_TYPE_ERASURE_CONCEPT_INTERFACE_HPP_INCLUDED
namespace boost {
namespace type_erasure {
/**
* The @ref concept_interface class can be specialized to
* add behavior to an @ref any. An @ref any inherits from
* all the relevant specializations of @ref concept_interface.
*
* @ref concept_interface can be specialized for either
* primitive or composite concepts. If a concept @c C1
* contains another concept @c C2, then the library guarantees
* that the specialization of @ref concept_interface for
* @c C2 is a base class of the specialization for @c C1.
* This means that @c C1 can safely override members of @c C2.
*
* @ref concept_interface may only be specialized for user-defined
* concepts. The library owns the specializations of its own
* built in concepts.
*
* \tparam Concept The concept that we're specializing
* @ref concept_interface for. One of its
* placeholders should be @c ID.
* \tparam Base The base of this class. Specializations of @ref
* concept_interface must inherit publicly from this type.
* \tparam ID The placeholder representing this type.
* \tparam Enable A dummy parameter that can be used for SFINAE.
*
* The metafunctions @ref derived, @ref rebind_any, and @ref as_param
* (which can be applied to @c Base) are useful for determining the
* argument and return types of functions defined in @ref concept_interface.
*
* For dispatching the function use \call.
*/
template<class Concept, class Base, class ID, class Enable = void>
struct concept_interface : Base {};
}
}
#endif
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