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/*=============================================================================
Copyright (c) 1998-2003 Joel de Guzman
http://spirit.sourceforge.net/
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)
=============================================================================*/
#if !defined(BOOST_SPIRIT_STORED_RULE_HPP)
#define BOOST_SPIRIT_STORED_RULE_HPP
///////////////////////////////////////////////////////////////////////////////
#include <boost/spirit/home/classic/namespace.hpp>
#include <boost/spirit/home/classic/core/non_terminal/impl/rule.ipp>
#include <boost/spirit/home/classic/dynamic/rule_alias.hpp>
#include <boost/shared_ptr.hpp>
#include <boost/spirit/home/classic/dynamic/stored_rule_fwd.hpp>
///////////////////////////////////////////////////////////////////////////////
namespace boost { namespace spirit {
BOOST_SPIRIT_CLASSIC_NAMESPACE_BEGIN
///////////////////////////////////////////////////////////////////////////
//
// stored_rule class
//
///////////////////////////////////////////////////////////////////////////
template <
typename T0
, typename T1
, typename T2
, bool EmbedByValue
>
class stored_rule
: public impl::rule_base<
stored_rule<T0, T1, T2, EmbedByValue>
, typename mpl::if_c<
EmbedByValue
, stored_rule<T0, T1, T2, true>
, stored_rule<T0, T1, T2> const&>::type
, T0, T1, T2>
{
public:
typedef stored_rule<T0, T1, T2, EmbedByValue> self_t;
typedef impl::rule_base<
self_t
, typename mpl::if_c<
EmbedByValue
, stored_rule<T0, T1, T2, true>
, self_t const&>::type
, T0, T1, T2>
base_t;
typedef typename base_t::scanner_t scanner_t;
typedef typename base_t::attr_t attr_t;
typedef impl::abstract_parser<scanner_t, attr_t> abstract_parser_t;
typedef rule_alias<self_t> alias_t;
stored_rule() : ptr() {}
~stored_rule() {}
stored_rule(stored_rule const& r)
: ptr(r.ptr) {}
template <typename ParserT>
stored_rule(ParserT const& p)
: ptr(new impl::concrete_parser<ParserT, scanner_t, attr_t>(p)) {}
template <typename ParserT>
stored_rule& operator=(ParserT const& p)
{
ptr.reset(new impl::concrete_parser<ParserT, scanner_t, attr_t>(p));
return *this;
}
stored_rule& operator=(stored_rule const& r)
{
// If this is placed above the templatized assignment
// operator, VC6 incorrectly complains ambiguity with
// r1 = r2, where r1 and r2 are both rules.
ptr = r.ptr;
return *this;
}
stored_rule<T0, T1, T2, true>
copy() const
{
return stored_rule<T0, T1, T2, true>(ptr);
}
alias_t
alias() const
{
return alias_t(*this);
}
private:
friend class impl::rule_base_access;
friend class stored_rule<T0, T1, T2, !EmbedByValue>;
abstract_parser_t*
get() const
{
return ptr.get();
}
stored_rule(shared_ptr<abstract_parser_t> const& ptr)
: ptr(ptr) {}
shared_ptr<abstract_parser_t> ptr;
};
///////////////////////////////////////////////////////////////////////////////
BOOST_SPIRIT_CLASSIC_NAMESPACE_END
}} // namespace BOOST_SPIRIT_CLASSIC_NS
#endif
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