112 lines
4.6 KiB
C++
112 lines
4.6 KiB
C++
/*=============================================================================
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Copyright (c) 2001-2007 Joel de Guzman
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Copyright (c) 2004 Daniel Wallin
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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 PHOENIX_SCOPE_LOCAL_VARIABLE_HPP
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#define PHOENIX_SCOPE_LOCAL_VARIABLE_HPP
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#include <boost/spirit/home/phoenix/core/limits.hpp>
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#include <boost/spirit/home/phoenix/detail/local_reference.hpp>
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#include <boost/spirit/home/phoenix/scope/detail/local_variable.hpp>
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#include <boost/spirit/home/phoenix/core/actor.hpp>
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#include <boost/mpl/bool.hpp>
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namespace boost { namespace phoenix
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{
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template <typename Key>
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struct local_variable
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{
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typedef Key key_type;
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// This will prevent actor::operator()() from kicking in.
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// Actually, we do not need all actor::operator()s for
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// all arities, but this will suffice. The nullary
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// actor::operator() is particularly troublesome because
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// it is always eagerly evaluated by the compiler.
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typedef mpl::true_ no_nullary;
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template <typename Env>
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struct result : detail::apply_local<local_variable<Key>, Env> {};
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template <typename Env>
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typename result<Env>::type
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eval(Env const& env) const
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{
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typedef typename result<Env>::type return_type;
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typedef typename
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detail::get_index<typename Env::map_type, Key>::type
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index_type;
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typedef detail::eval_local<Key> eval_local;
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return eval_local::template get<return_type>(
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env
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, index_type());
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}
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private:
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// silence MSVC warning C4512: assignment operator could not be generated
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local_variable& operator= (local_variable const&);
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};
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namespace local_names
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{
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actor<local_variable<struct _a_key> > const _a
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= local_variable<struct _a_key>();
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actor<local_variable<struct _b_key> > const _b
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= local_variable<struct _b_key>();
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actor<local_variable<struct _c_key> > const _c
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= local_variable<struct _c_key>();
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actor<local_variable<struct _d_key> > const _d
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= local_variable<struct _d_key>();
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actor<local_variable<struct _e_key> > const _e
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= local_variable<struct _e_key>();
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actor<local_variable<struct _f_key> > const _f
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= local_variable<struct _f_key>();
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actor<local_variable<struct _g_key> > const _g
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= local_variable<struct _g_key>();
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actor<local_variable<struct _h_key> > const _h
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= local_variable<struct _h_key>();
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actor<local_variable<struct _i_key> > const _i
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= local_variable<struct _i_key>();
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actor<local_variable<struct _j_key> > const _j
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= local_variable<struct _j_key>();
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actor<local_variable<struct _k_key> > const _k
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= local_variable<struct _k_key>();
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actor<local_variable<struct _l_key> > const _l
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= local_variable<struct _l_key>();
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actor<local_variable<struct _m_key> > const _m
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= local_variable<struct _m_key>();
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actor<local_variable<struct _n_key> > const _n
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= local_variable<struct _n_key>();
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actor<local_variable<struct _o_key> > const _o
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= local_variable<struct _o_key>();
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actor<local_variable<struct _p_key> > const _p
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= local_variable<struct _p_key>();
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actor<local_variable<struct _q_key> > const _q
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= local_variable<struct _q_key>();
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actor<local_variable<struct _r_key> > const _r
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= local_variable<struct _r_key>();
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actor<local_variable<struct _s_key> > const _s
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= local_variable<struct _s_key>();
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actor<local_variable<struct _t_key> > const _t
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= local_variable<struct _t_key>();
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actor<local_variable<struct _u_key> > const _u
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= local_variable<struct _u_key>();
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actor<local_variable<struct _v_key> > const _v
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= local_variable<struct _v_key>();
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actor<local_variable<struct _w_key> > const _w
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= local_variable<struct _w_key>();
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actor<local_variable<struct _x_key> > const _x
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= local_variable<struct _x_key>();
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actor<local_variable<struct _y_key> > const _y
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= local_variable<struct _y_key>();
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actor<local_variable<struct _z_key> > const _z
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= local_variable<struct _z_key>();
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}
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}}
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#endif
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