boost/local_function/aux_/add_pointed_const.hpp

// Copyright (C) 2009-2012 Lorenzo Caminiti
// Distributed under the Boost Software License, Version 1.0
// (see accompanying file LICENSE_1_0.txt or a copy at
// http://www.boost.org/LICENSE_1_0.txt)
// Home at http://www.boost.org/libs/local_function
#ifndef BOOST_LOCAL_FUNCTION_AUX_ADD_POINTED_CONST_HPP_
#define BOOST_LOCAL_FUNCTION_AUX_ADD_POINTED_CONST_HPP_
namespace boost { namespace local_function { namespace aux {
// Metafunction to add const to pointed type `T` (i.e. converts
// `T* [const]` to `T const* [const]`). `boost::add_const<>` cannot be used 
// instead because only adds outer const.
template<typename T> struct add_pointed_const { typedef T type; };
template<typename T> struct add_pointed_const<T*> { typedef T const* type; };
template<typename T> struct add_pointed_const<T const*>
    { typedef T const* type; };
template<typename T> struct add_pointed_const<T* const>
    { typedef T const* const type; };
template<typename T> struct add_pointed_const<T const* const>
    { typedef T const* const type; };
} } } // namespace
#endif //#include guard