boost/phoenix/statement/try_catch.hpp
/*==============================================================================
Copyright (c) 2005-2007 Dan Marsden
Copyright (c) 2005-2010 Joel de Guzman
Copyright (c) 2010 Thomas Heller
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)
==============================================================================*/
#ifndef BOOST_PHOENIX_STATEMENT_TRY_CATCH_HPP
#define BOOST_PHOENIX_STATEMENT_TRY_CATCH_HPP
#include <boost/phoenix/core/limits.hpp>
#include <boost/phoenix/core/call.hpp>
#include <boost/phoenix/core/expression.hpp>
#include <boost/phoenix/core/meta_grammar.hpp>
#include <boost/phoenix/core/is_nullary.hpp>
#include <boost/phoenix/scope/local_variable.hpp>
#include <boost/phoenix/scope/scoped_environment.hpp>
#include <boost/proto/functional/fusion/pop_front.hpp>
#include <boost/core/enable_if.hpp>
#ifdef _MSC_VER
#pragma warning(push)
#pragma warning(disable: 4355) // 'this' : used in base member initializer list
#endif
namespace boost { namespace phoenix
{
template <typename Expr>
struct try_catch_actor;
template <typename Exception>
struct catch_exception
{
typedef Exception type;
};
namespace tag
{
struct try_catch {};
struct catch_ {};
struct catch_all {};
}
namespace expression
{
template <
typename Try
, BOOST_PHOENIX_typename_A_void(BOOST_PHOENIX_CATCH_LIMIT)
, typename Dummy = void
>
struct try_catch;
// bring in the expression definitions
#include <boost/phoenix/statement/detail/try_catch_expression.hpp>
template <typename A0, typename A1, typename A2 = void>
struct catch_
: proto::nary_expr<tag::catch_, A0, A1, A2>
{};
template <typename A0, typename A1>
struct catch_<A0, A1, void>
: proto::binary_expr<tag::catch_, A0, A1>
{};
template <typename A0>
struct catch_all
: proto::unary_expr<tag::catch_all, A0>
{};
}
namespace rule
{
typedef
expression::catch_<
proto::terminal<catch_exception<proto::_> >
, local_variable
, meta_grammar
>
captured_catch;
typedef
expression::catch_<
proto::terminal<catch_exception<proto::_> >
, meta_grammar
>
non_captured_catch;
struct catch_
: proto::or_<
captured_catch
, non_captured_catch
>
{};
struct catch_all
: expression::catch_all<
meta_grammar
>
{};
struct try_catch
: proto::or_<
expression::try_catch<
meta_grammar
, proto::vararg<rule::catch_>
>
, expression::try_catch<
meta_grammar
, rule::catch_all
>
, expression::try_catch<
meta_grammar
, proto::vararg<rule::catch_>
, rule::catch_all
>
>
{};
}
template <typename Dummy>
struct meta_grammar::case_<tag::try_catch, Dummy>
: enable_rule<rule::try_catch, Dummy>
{};
struct try_catch_eval
{
typedef void result_type;
template <typename Try, typename Context>
void operator()(Try const &, Context const &) const
{}
template <typename Catch, typename Exception, typename Context>
typename enable_if<proto::matches<Catch, rule::non_captured_catch> >::type
eval_catch_body(Catch const &c, Exception & /*unused*/, Context const &ctx) const
{
phoenix::eval(proto::child_c<1>(c), ctx);
}
template <typename Catch, typename Exception, typename Context>
typename enable_if<proto::matches<Catch, rule::captured_catch> >::type
eval_catch_body(Catch const &c, Exception &e, Context const &ctx) const
{
typedef
typename proto::detail::uncvref<
typename proto::result_of::value<
typename proto::result_of::child_c<Catch, 1>::type
>::type
>::type
capture_type;
typedef
typename proto::detail::uncvref<
typename result_of::env<Context>::type
>::type
env_type;
typedef vector1<Exception &> local_type;
typedef detail::map_local_index_to_tuple<capture_type> map_type;
typedef
phoenix::scoped_environment<
env_type
, env_type
, local_type
, map_type
>
scoped_env_tpe;
local_type local = {e};
scoped_env_tpe env(phoenix::env(ctx), phoenix::env(ctx), local);
phoenix::eval(proto::child_c<2>(c), phoenix::context(env, phoenix::actions(ctx)));
}
// bring in the operator overloads
#include <boost/phoenix/statement/detail/try_catch_eval.hpp>
};
template <typename Dummy>
struct default_actions::when<rule::try_catch, Dummy>
: call<try_catch_eval, Dummy>
{};
namespace detail
{
struct try_catch_is_nullary
: proto::or_<
proto::when<
phoenix::rule::catch_all
, proto::call<
evaluator(
proto::_child_c<0>
, proto::_data
, proto::make<proto::empty_env()>
)
>
>
, proto::when<
phoenix::rule::catch_
, proto::or_<
proto::when<
phoenix::rule::captured_catch
, proto::call<
evaluator(
proto::_child_c<2>
, proto::call<
phoenix::functional::context(
proto::make<mpl::true_()>
, proto::make<detail::scope_is_nullary_actions()>
)
>
, proto::make<proto::empty_env()>
)
>
>
, proto::otherwise<
proto::call<
evaluator(
proto::_child_c<1>
, proto::_data
, proto::make<proto::empty_env()>
)
>
>
>
>
, proto::when<
phoenix::rule::try_catch
, proto::make<
mpl::and_<
proto::call<
evaluator(
proto::_child_c<0>
, proto::_data
, proto::make<proto::empty_env()>
)
>
, proto::fold<
proto::call<
proto::functional::pop_front(proto::_)
>
, proto::make<mpl::true_()>
, proto::make<
mpl::and_<
proto::_state
, proto::call<
try_catch_is_nullary(
proto::_
, proto::make<proto::empty_env()>
, proto::_data
)
>
>()
>
>
>()
>
>
>
{};
template <
typename TryCatch
, typename Exception
, typename Capture
, typename Expr
, long Arity = proto::arity_of<TryCatch>::value
>
struct catch_push_back;
template <typename TryCatch, typename Exception, typename Capture, typename Expr>
struct catch_push_back<TryCatch, Exception, Capture, Expr, 1>
{
typedef
typename proto::result_of::make_expr<
phoenix::tag::catch_
, proto::basic_default_domain
, catch_exception<Exception>
, Capture
, Expr
>::type
catch_expr;
typedef
phoenix::expression::try_catch<
TryCatch
, catch_expr
>
gen_type;
typedef typename gen_type::type type;
static type make(TryCatch const & try_catch, Capture const & capture, Expr const & catch_)
{
return
gen_type::make(
try_catch
, proto::make_expr<
phoenix::tag::catch_
, proto::basic_default_domain
>(catch_exception<Exception>(), capture, catch_)
);
}
};
template <typename TryCatch, typename Exception, typename Expr>
struct catch_push_back<TryCatch, Exception, void, Expr, 1>
{
typedef
typename proto::result_of::make_expr<
phoenix::tag::catch_
, proto::basic_default_domain
, catch_exception<Exception>
, Expr
>::type
catch_expr;
typedef
phoenix::expression::try_catch<
TryCatch
, catch_expr
>
gen_type;
typedef typename gen_type::type type;
static type make(TryCatch const & try_catch, Expr const & catch_)
{
return
gen_type::make(
try_catch
, proto::make_expr<
phoenix::tag::catch_
, proto::basic_default_domain
>(catch_exception<Exception>(), catch_)
);
}
};
template <
typename TryCatch
, typename Expr
, long Arity = proto::arity_of<TryCatch>::value
>
struct catch_all_push_back;
template <typename TryCatch, typename Expr>
struct catch_all_push_back<TryCatch, Expr, 1>
{
typedef
typename proto::result_of::make_expr<
phoenix::tag::catch_all
, proto::basic_default_domain
, Expr
>::type
catch_expr;
typedef
phoenix::expression::try_catch<
TryCatch
, catch_expr
>
gen_type;
typedef typename gen_type::type type;
static type make(TryCatch const& try_catch, Expr const& catch_)
{
return
gen_type::make(
try_catch
, proto::make_expr<
phoenix::tag::catch_all
, proto::basic_default_domain
>(catch_)
);
}
};
#include <boost/phoenix/statement/detail/catch_push_back.hpp>
}
template <typename Dummy>
struct is_nullary::when<rule::try_catch, Dummy>
: proto::call<
detail::try_catch_is_nullary(
proto::_
, proto::make<proto::empty_env()>
, _context
)
>
{};
template <typename TryCatch, typename Exception, typename Capture = void>
struct catch_gen
{
catch_gen(TryCatch const& try_catch_, Capture const& capture)
: try_catch(try_catch_)
, capture(capture) {}
template <typename Expr>
typename boost::disable_if<
proto::matches<
typename proto::result_of::child_c<
TryCatch
, proto::arity_of<TryCatch>::value - 1
>::type
, rule::catch_all
>
, typename detail::catch_push_back<TryCatch, Exception, Capture, Expr>::type
>::type
operator[](Expr const& expr) const
{
return
detail::catch_push_back<TryCatch, Exception, Capture, Expr>::make(
try_catch, capture, expr
);
}
TryCatch const & try_catch;
Capture const & capture;
};
template <typename TryCatch, typename Exception>
struct catch_gen<TryCatch, Exception, void>
{
catch_gen(TryCatch const& try_catch_) : try_catch(try_catch_) {}
template <typename Expr>
typename boost::disable_if<
proto::matches<
typename proto::result_of::child_c<
TryCatch
, proto::arity_of<TryCatch>::value - 1
>::type
, rule::catch_all
>
, typename detail::catch_push_back<TryCatch, Exception, void, Expr>::type
>::type
operator[](Expr const& expr) const
{
return
detail::catch_push_back<TryCatch, Exception, void, Expr>::make(
try_catch, expr
);
}
TryCatch const & try_catch;
};
template <typename TryCatch>
struct catch_all_gen
{
catch_all_gen(TryCatch const& try_catch_) : try_catch(try_catch_) {}
template <typename Expr>
typename boost::disable_if<
proto::matches<
typename proto::result_of::child_c<
TryCatch
, proto::arity_of<TryCatch>::value - 1
>::type
, rule::catch_all
>
, typename detail::catch_all_push_back<TryCatch, Expr>::type
>::type
operator[](Expr const& expr) const
{
return detail::catch_all_push_back<TryCatch, Expr>::make(
try_catch, expr
);
}
TryCatch const & try_catch;
};
template <
typename Expr
>
struct try_catch_actor;
template <typename Expr>
struct try_catch_actor
: actor<Expr>
{
typedef try_catch_actor<Expr> that_type;
typedef actor<Expr> base_type;
try_catch_actor(base_type const& expr)
: base_type(expr)
, catch_all(*this)
{
}
template <typename Exception>
catch_gen<that_type, Exception> const
catch_() const
{
return catch_gen<that_type, Exception>(*this);
}
template <typename Exception, typename Capture>
catch_gen<that_type, Exception, Capture> const
catch_(Capture const &expr) const
{
return catch_gen<that_type, Exception, Capture>(*this, expr);
}
catch_all_gen<that_type> const catch_all;
};
struct try_gen
{
template <typename Try>
typename expression::try_catch<Try>::type const
operator[](Try const & try_) const
{
return expression::try_catch<Try>::make(try_);
}
};
#ifndef BOOST_PHOENIX_NO_PREDEFINED_TERMINALS
try_gen const try_ = {};
#endif
}}
#ifdef _MSC_VER
#pragma warning(pop)
#endif
#endif
