84 lines
2.7 KiB
C++
84 lines
2.7 KiB
C++
/*=============================================================================
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Copyright (c) 2001-2011 Joel de Guzman
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http://spirit.sourceforge.net/
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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=============================================================================*/
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#ifndef BOOST_SPIRIT_MAKE_CONS_OCTOBER_16_2008_1252PM
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#define BOOST_SPIRIT_MAKE_CONS_OCTOBER_16_2008_1252PM
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#if defined(_MSC_VER)
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#pragma once
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#endif
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#include <boost/mpl/eval_if.hpp>
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#include <boost/fusion/include/cons.hpp>
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#include <boost/type_traits/remove_const.hpp>
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#include <boost/type_traits/is_abstract.hpp>
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#include <boost/type_traits/is_function.hpp>
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#include <boost/type_traits/add_reference.hpp>
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#include <boost/utility/enable_if.hpp>
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namespace boost { namespace spirit { namespace detail
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{
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template <typename T>
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struct as_meta_element
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: mpl::eval_if_c<is_abstract<T>::value || is_function<T>::value
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, add_reference<T>, remove_const<T> >
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{};
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template <typename T>
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struct as_meta_element<T&> : as_meta_element<T> // always store by value
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{};
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template <typename T, int N>
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struct as_meta_element<T[N]>
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{
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typedef const T(&type)[N];
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};
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namespace result_of
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{
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template <typename Car, typename Cdr = fusion::nil_>
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struct make_cons
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{
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typedef typename as_meta_element<Car>::type car_type; typedef typename fusion::cons<car_type, Cdr> type;
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};
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}
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template <typename Car, typename Cdr>
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fusion::cons<typename as_meta_element<Car>::type, Cdr>
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make_cons(Car const& car, Cdr const& cdr)
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{
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typedef typename as_meta_element<Car>::type car_type;
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typedef typename fusion::cons<car_type, Cdr> result;
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return result(car, cdr);
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}
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template <typename Car>
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fusion::cons<typename as_meta_element<Car>::type>
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make_cons(Car const& car)
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{
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typedef typename as_meta_element<Car>::type car_type;
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typedef typename fusion::cons<car_type> result;
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return result(car);
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}
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#if defined(__GNUC__) && (__GNUC__ == 4) && (__GNUC_MINOR__ == 0)
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// workaround for gcc-4.0 bug where illegal function types
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// can be formed (const is added to function type)
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// description: http://lists.boost.org/Archives/boost/2009/04/150743.php
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template <typename Car>
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fusion::cons<typename as_meta_element<Car>::type>
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make_cons(Car& car, typename enable_if<is_function<Car> >::type* = 0)
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{
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typedef typename as_meta_element<Car>::type car_type;
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typedef typename fusion::cons<car_type> result;
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return result(car);
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}
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#endif
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}}}
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#endif
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