boost/proto/transform/default.hpp
#ifndef BOOST_PP_IS_ITERATING
///////////////////////////////////////////////////////////////////////////////
/// \file default.hpp
/// Contains definition of the _default transform, which gives operators their
/// usual C++ meanings and uses Boost.Typeof to deduce return types.
//
// Copyright 2008 Eric Niebler. 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_PROTO_TRANSFORM_DEFAULT_HPP_EAN_04_04_2008
#define BOOST_PROTO_TRANSFORM_DEFAULT_HPP_EAN_04_04_2008
#include <boost/preprocessor/iteration/iterate.hpp>
#include <boost/preprocessor/repetition/repeat.hpp>
#include <boost/preprocessor/arithmetic/add.hpp>
#include <boost/preprocessor/arithmetic/sub.hpp>
#include <boost/preprocessor/repetition/enum.hpp>
#include <boost/preprocessor/repetition/enum_shifted.hpp>
#include <boost/preprocessor/repetition/enum_shifted_params.hpp>
#include <boost/ref.hpp>
#include <boost/get_pointer.hpp>
#include <boost/utility/enable_if.hpp>
#include <boost/type_traits/is_member_pointer.hpp>
#include <boost/type_traits/is_member_object_pointer.hpp>
#include <boost/type_traits/is_member_function_pointer.hpp>
#include <boost/proto/proto_fwd.hpp>
#include <boost/proto/traits.hpp>
#include <boost/proto/transform/impl.hpp>
#include <boost/proto/transform/arg.hpp>
#include <boost/proto/detail/decltype.hpp>
namespace boost { namespace proto
{
namespace detail
{
template<typename Grammar, typename Tag>
struct default_case
: not_<_>
{};
template<typename Grammar>
struct default_case<Grammar, tag::terminal>
: when<terminal<_>, _value>
{};
template<typename Grammar>
struct default_cases
{
template<typename Tag>
struct case_
: default_case<Grammar, Tag>
{};
};
#define BOOST_PROTO_UNARY_DEFAULT_EVAL(OP, TAG, MAKE) \
template<typename Grammar> \
struct BOOST_PP_CAT(default_, TAG) \
: transform<BOOST_PP_CAT(default_, TAG)<Grammar> > \
{ \
template<typename Expr, typename State, typename Data> \
struct impl \
: transform_impl<Expr, State, Data> \
{ \
private: \
typedef typename result_of::child_c<Expr, 0>::type e0; \
typedef typename Grammar::template impl<e0, State, Data>::result_type r0; \
public: \
BOOST_PROTO_DECLTYPE_(OP proto::detail::MAKE<r0>(), result_type) \
result_type operator ()( \
typename impl::expr_param e \
, typename impl::state_param s \
, typename impl::data_param d \
) const \
{ \
typename Grammar::template impl<e0, State, Data> t0; \
return OP t0(proto::child_c<0>(e), s, d); \
} \
}; \
}; \
\
template<typename Grammar> \
struct default_case<Grammar, tag::TAG> \
: when<unary_expr<tag::TAG, Grammar>, BOOST_PP_CAT(default_, TAG)<Grammar> > \
{}; \
/**/
#define BOOST_PROTO_BINARY_DEFAULT_EVAL(OP, TAG, LMAKE, RMAKE) \
template<typename Grammar> \
struct BOOST_PP_CAT(default_, TAG) \
: transform<BOOST_PP_CAT(default_, TAG)<Grammar> > \
{ \
template<typename Expr, typename State, typename Data> \
struct impl \
: transform_impl<Expr, State, Data> \
{ \
private: \
typedef typename result_of::child_c<Expr, 0>::type e0; \
typedef typename result_of::child_c<Expr, 1>::type e1; \
typedef typename Grammar::template impl<e0, State, Data>::result_type r0; \
typedef typename Grammar::template impl<e1, State, Data>::result_type r1; \
public: \
BOOST_PROTO_DECLTYPE_( \
proto::detail::LMAKE<r0>() OP proto::detail::RMAKE<r1>() \
, result_type \
) \
result_type operator ()( \
typename impl::expr_param e \
, typename impl::state_param s \
, typename impl::data_param d \
) const \
{ \
typename Grammar::template impl<e0, State, Data> t0; \
typename Grammar::template impl<e1, State, Data> t1; \
return t0(proto::child_c<0>(e), s, d) \
OP t1(proto::child_c<1>(e), s, d); \
} \
}; \
}; \
\
template<typename Grammar> \
struct default_case<Grammar, tag::TAG> \
: when<binary_expr<tag::TAG, Grammar, Grammar>, BOOST_PP_CAT(default_, TAG)<Grammar> > \
{}; \
/**/
BOOST_PROTO_UNARY_DEFAULT_EVAL(+, unary_plus, make)
BOOST_PROTO_UNARY_DEFAULT_EVAL(-, negate, make)
BOOST_PROTO_UNARY_DEFAULT_EVAL(*, dereference, make)
BOOST_PROTO_UNARY_DEFAULT_EVAL(~, complement, make)
BOOST_PROTO_UNARY_DEFAULT_EVAL(&, address_of, make)
BOOST_PROTO_UNARY_DEFAULT_EVAL(!, logical_not, make)
BOOST_PROTO_UNARY_DEFAULT_EVAL(++, pre_inc, make_mutable)
BOOST_PROTO_UNARY_DEFAULT_EVAL(--, pre_dec, make_mutable)
BOOST_PROTO_BINARY_DEFAULT_EVAL(<<, shift_left, make_mutable, make)
BOOST_PROTO_BINARY_DEFAULT_EVAL(>>, shift_right, make_mutable, make_mutable)
BOOST_PROTO_BINARY_DEFAULT_EVAL(*, multiplies, make, make)
BOOST_PROTO_BINARY_DEFAULT_EVAL(/, divides, make, make)
BOOST_PROTO_BINARY_DEFAULT_EVAL(%, modulus, make, make)
BOOST_PROTO_BINARY_DEFAULT_EVAL(+, plus, make, make)
BOOST_PROTO_BINARY_DEFAULT_EVAL(-, minus, make, make)
BOOST_PROTO_BINARY_DEFAULT_EVAL(<, less, make, make)
BOOST_PROTO_BINARY_DEFAULT_EVAL(>, greater, make, make)
BOOST_PROTO_BINARY_DEFAULT_EVAL(<=, less_equal, make, make)
BOOST_PROTO_BINARY_DEFAULT_EVAL(>=, greater_equal, make, make)
BOOST_PROTO_BINARY_DEFAULT_EVAL(==, equal_to, make, make)
BOOST_PROTO_BINARY_DEFAULT_EVAL(!=, not_equal_to, make, make)
BOOST_PROTO_BINARY_DEFAULT_EVAL(||, logical_or, make, make)
BOOST_PROTO_BINARY_DEFAULT_EVAL(&&, logical_and, make, make)
BOOST_PROTO_BINARY_DEFAULT_EVAL(&, bitwise_and, make, make)
BOOST_PROTO_BINARY_DEFAULT_EVAL(|, bitwise_or, make, make)
BOOST_PROTO_BINARY_DEFAULT_EVAL(^, bitwise_xor, make, make)
BOOST_PROTO_BINARY_DEFAULT_EVAL(=, assign, make_mutable, make)
BOOST_PROTO_BINARY_DEFAULT_EVAL(<<=, shift_left_assign, make_mutable, make)
BOOST_PROTO_BINARY_DEFAULT_EVAL(>>=, shift_right_assign, make_mutable, make)
BOOST_PROTO_BINARY_DEFAULT_EVAL(*=, multiplies_assign, make_mutable, make)
BOOST_PROTO_BINARY_DEFAULT_EVAL(/=, divides_assign, make_mutable, make)
BOOST_PROTO_BINARY_DEFAULT_EVAL(%=, modulus_assign, make_mutable, make)
BOOST_PROTO_BINARY_DEFAULT_EVAL(+=, plus_assign, make_mutable, make)
BOOST_PROTO_BINARY_DEFAULT_EVAL(-=, minus_assign, make_mutable, make)
BOOST_PROTO_BINARY_DEFAULT_EVAL(&=, bitwise_and_assign, make_mutable, make)
BOOST_PROTO_BINARY_DEFAULT_EVAL(|=, bitwise_or_assign, make_mutable, make)
BOOST_PROTO_BINARY_DEFAULT_EVAL(^=, bitwise_xor_assign, make_mutable, make)
#undef BOOST_PROTO_UNARY_DEFAULT_EVAL
#undef BOOST_PROTO_BINARY_DEFAULT_EVAL
/// INTERNAL ONLY
template<typename Grammar, typename Expr, typename State, typename Data>
struct is_member_function_invocation
: is_member_function_pointer<
typename uncvref<
typename Grammar::template impl<
typename result_of::child_c<Expr, 1>::type
, State
, Data
>::result_type
>::type
>
{};
/// INTERNAL ONLY
template<typename Grammar, typename Expr, typename State, typename Data, bool IsMemFunCall>
struct default_mem_ptr_impl
: transform_impl<Expr, State, Data>
{
private:
typedef typename result_of::child_c<Expr, 0>::type e0;
typedef typename result_of::child_c<Expr, 1>::type e1;
typedef typename Grammar::template impl<e0, State, Data>::result_type r0;
typedef typename Grammar::template impl<e1, State, Data>::result_type r1;
public:
typedef typename detail::mem_ptr_fun<r0, r1>::result_type result_type;
result_type operator ()(
typename default_mem_ptr_impl::expr_param e
, typename default_mem_ptr_impl::state_param s
, typename default_mem_ptr_impl::data_param d
) const
{
typename Grammar::template impl<e0, State, Data> t0;
typename Grammar::template impl<e1, State, Data> t1;
return detail::mem_ptr_fun<r0, r1>()(
t0(proto::child_c<0>(e), s, d)
, t1(proto::child_c<1>(e), s, d)
);
}
};
/// INTERNAL ONLY
template<typename Grammar, typename Expr, typename State, typename Data>
struct default_mem_ptr_impl<Grammar, Expr, State, Data, true>
: transform_impl<Expr, State, Data>
{
private:
typedef typename result_of::child_c<Expr, 0>::type e0;
typedef typename result_of::child_c<Expr, 1>::type e1;
typedef typename Grammar::template impl<e0, State, Data>::result_type r0;
typedef typename Grammar::template impl<e1, State, Data>::result_type r1;
public:
typedef detail::memfun<r0, r1> result_type;
result_type const operator ()(
typename default_mem_ptr_impl::expr_param e
, typename default_mem_ptr_impl::state_param s
, typename default_mem_ptr_impl::data_param d
) const
{
typename Grammar::template impl<e0, State, Data> t0;
typename Grammar::template impl<e1, State, Data> t1;
return detail::memfun<r0, r1>(
t0(proto::child_c<0>(e), s, d)
, t1(proto::child_c<1>(e), s, d)
);
}
};
template<typename Grammar>
struct default_mem_ptr
: transform<default_mem_ptr<Grammar> >
{
template<typename Expr, typename State, typename Data>
struct impl
: default_mem_ptr_impl<
Grammar
, Expr
, State
, Data
, is_member_function_invocation<Grammar, Expr, State, Data>::value
>
{};
};
template<typename Grammar>
struct default_case<Grammar, tag::mem_ptr>
: when<mem_ptr<Grammar, Grammar>, default_mem_ptr<Grammar> >
{};
template<typename Grammar>
struct default_post_inc
: transform<default_post_inc<Grammar> >
{
template<typename Expr, typename State, typename Data>
struct impl
: transform_impl<Expr, State, Data>
{
private:
typedef typename result_of::child_c<Expr, 0>::type e0;
typedef typename Grammar::template impl<e0, State, Data>::result_type r0;
public:
BOOST_PROTO_DECLTYPE_(proto::detail::make_mutable<r0>() ++, result_type)
result_type operator ()(
typename impl::expr_param e
, typename impl::state_param s
, typename impl::data_param d
) const
{
typename Grammar::template impl<e0, State, Data> t0;
return t0(proto::child_c<0>(e), s, d) ++;
}
};
};
template<typename Grammar>
struct default_case<Grammar, tag::post_inc>
: when<post_inc<Grammar>, default_post_inc<Grammar> >
{};
template<typename Grammar>
struct default_post_dec
: transform<default_post_dec<Grammar> >
{
template<typename Expr, typename State, typename Data>
struct impl
: transform_impl<Expr, State, Data>
{
private:
typedef typename result_of::child_c<Expr, 0>::type e0;
typedef typename Grammar::template impl<e0, State, Data>::result_type r0;
public:
BOOST_PROTO_DECLTYPE_(proto::detail::make_mutable<r0>() --, result_type)
result_type operator ()(
typename impl::expr_param e
, typename impl::state_param s
, typename impl::data_param d
) const
{
typename Grammar::template impl<e0, State, Data> t0;
return t0(proto::child_c<0>(e), s, d) --;
}
};
};
template<typename Grammar>
struct default_case<Grammar, tag::post_dec>
: when<post_dec<Grammar>, default_post_dec<Grammar> >
{};
template<typename Grammar>
struct default_subscript
: transform<default_subscript<Grammar> >
{
template<typename Expr, typename State, typename Data>
struct impl
: transform_impl<Expr, State, Data>
{
private:
typedef typename result_of::child_c<Expr, 0>::type e0;
typedef typename result_of::child_c<Expr, 1>::type e1;
typedef typename Grammar::template impl<e0, State, Data>::result_type r0;
typedef typename Grammar::template impl<e1, State, Data>::result_type r1;
public:
BOOST_PROTO_DECLTYPE_(
proto::detail::make_subscriptable<r0>() [ proto::detail::make<r1>() ]
, result_type
)
result_type operator ()(
typename impl::expr_param e
, typename impl::state_param s
, typename impl::data_param d
) const
{
typename Grammar::template impl<e0, State, Data> t0;
typename Grammar::template impl<e1, State, Data> t1;
return t0(proto::child_c<0>(e), s, d) [
t1(proto::child_c<1>(e), s, d) ];
}
};
};
template<typename Grammar>
struct default_case<Grammar, tag::subscript>
: when<subscript<Grammar, Grammar>, default_subscript<Grammar> >
{};
template<typename Grammar>
struct default_if_else_
{
template<typename Expr, typename State, typename Data>
struct impl
: transform_impl<Expr, State, Data>
{
private:
typedef typename result_of::child_c<Expr, 0>::type e0;
typedef typename result_of::child_c<Expr, 1>::type e1;
typedef typename result_of::child_c<Expr, 2>::type e2;
typedef typename Grammar::template impl<e0, State, Data>::result_type r0;
typedef typename Grammar::template impl<e1, State, Data>::result_type r1;
typedef typename Grammar::template impl<e2, State, Data>::result_type r2;
public:
BOOST_PROTO_DECLTYPE_(
proto::detail::make<r0>()
? proto::detail::make<r1>()
: proto::detail::make<r2>()
, result_type
)
result_type operator ()(
typename impl::expr_param e
, typename impl::state_param s
, typename impl::data_param d
) const
{
typename Grammar::template impl<e0, State, Data> t0;
typename Grammar::template impl<e1, State, Data> t1;
typename Grammar::template impl<e2, State, Data> t2;
return t0(proto::child_c<0>(e), s, d)
? t1(proto::child_c<1>(e), s, d)
: t2(proto::child_c<2>(e), s, d);
}
};
};
template<typename Grammar>
struct default_case<Grammar, tag::if_else_>
: when<if_else_<Grammar, Grammar, Grammar>, default_if_else_<Grammar> >
{};
template<typename Grammar>
struct default_comma
: transform<default_comma<Grammar> >
{
template<typename Expr, typename State, typename Data>
struct impl
: transform_impl<Expr, State, Data>
{
private:
typedef typename result_of::child_c<Expr, 0>::type e0;
typedef typename result_of::child_c<Expr, 1>::type e1;
typedef typename Grammar::template impl<e0, State, Data>::result_type r0;
typedef typename Grammar::template impl<e1, State, Data>::result_type r1;
public:
typedef typename proto::detail::comma_result<r0, r1>::type result_type;
result_type operator ()(
typename impl::expr_param e
, typename impl::state_param s
, typename impl::data_param d
) const
{
typename Grammar::template impl<e0, State, Data> t0;
typename Grammar::template impl<e1, State, Data> t1;
return t0(proto::child_c<0>(e), s, d)
, t1(proto::child_c<1>(e), s, d);
}
};
};
template<typename Grammar>
struct default_case<Grammar, tag::comma>
: when<comma<Grammar, Grammar>, default_comma<Grammar> >
{};
template<typename Grammar, typename Expr, typename State, typename Data, long Arity>
struct default_function_impl;
template<typename Grammar>
struct default_function
: transform<default_function<Grammar> >
{
template<typename Expr, typename State, typename Data>
struct impl
: default_function_impl<
Grammar
, Expr
, State
, Data
, transform_impl<Expr, State, Data>::expr::proto_arity_c
>
{};
};
template<typename Grammar>
struct default_case<Grammar, tag::function>
: when<function<Grammar, vararg<Grammar> >, default_function<Grammar> >
{};
#define BOOST_PROTO_DEFAULT_EVAL_TYPE(Z, N, DATA) \
typedef \
typename result_of::child_c<DATA, N>::type \
BOOST_PP_CAT(e, N); \
\
typedef \
typename Grammar::template impl<BOOST_PP_CAT(e, N), State, Data>::result_type \
BOOST_PP_CAT(r, N); \
/**/
#define BOOST_PROTO_DEFAULT_EVAL(Z, N, DATA) \
typename Grammar::template impl<BOOST_PP_CAT(e, N), State, Data>()( \
proto::child_c<N>(DATA), s, d \
) \
/**/
template<typename Grammar, typename Expr, typename State, typename Data>
struct default_function_impl<Grammar, Expr, State, Data, 1>
: transform_impl<Expr, State, Data>
{
BOOST_PROTO_DEFAULT_EVAL_TYPE(~, 0, Expr)
typedef
typename proto::detail::result_of_fixup<r0>::type
function_type;
typedef
typename boost::tr1_result_of<function_type()>::type
result_type;
result_type operator ()(
typename default_function_impl::expr_param e
, typename default_function_impl::state_param s
, typename default_function_impl::data_param d
) const
{
return BOOST_PROTO_DEFAULT_EVAL(~, 0, e)();
}
};
template<typename Grammar, typename Expr, typename State, typename Data>
struct default_function_impl<Grammar, Expr, State, Data, 2>
: transform_impl<Expr, State, Data>
{
BOOST_PROTO_DEFAULT_EVAL_TYPE(~, 0, Expr)
BOOST_PROTO_DEFAULT_EVAL_TYPE(~, 1, Expr)
typedef
typename proto::detail::result_of_fixup<r0>::type
function_type;
typedef
typename detail::result_of_<function_type(r1)>::type
result_type;
result_type operator ()(
typename default_function_impl::expr_param e
, typename default_function_impl::state_param s
, typename default_function_impl::data_param d
) const
{
return this->invoke(
e
, s
, d
, is_member_function_pointer<function_type>()
, is_member_object_pointer<function_type>()
);
}
private:
result_type invoke(
typename default_function_impl::expr_param e
, typename default_function_impl::state_param s
, typename default_function_impl::data_param d
, mpl::false_
, mpl::false_
) const
{
return BOOST_PROTO_DEFAULT_EVAL(~, 0, e)(BOOST_PROTO_DEFAULT_EVAL(~, 1, e));
}
result_type invoke(
typename default_function_impl::expr_param e
, typename default_function_impl::state_param s
, typename default_function_impl::data_param d
, mpl::true_
, mpl::false_
) const
{
BOOST_PROTO_USE_GET_POINTER();
typedef typename detail::classtypeof<function_type>::type class_type;
return (
BOOST_PROTO_GET_POINTER(class_type, BOOST_PROTO_DEFAULT_EVAL(~, 1, e)) ->*
BOOST_PROTO_DEFAULT_EVAL(~, 0, e)
)();
}
result_type invoke(
typename default_function_impl::expr_param e
, typename default_function_impl::state_param s
, typename default_function_impl::data_param d
, mpl::false_
, mpl::true_
) const
{
BOOST_PROTO_USE_GET_POINTER();
typedef typename detail::classtypeof<function_type>::type class_type;
return (
BOOST_PROTO_GET_POINTER(class_type, BOOST_PROTO_DEFAULT_EVAL(~, 1, e)) ->*
BOOST_PROTO_DEFAULT_EVAL(~, 0, e)
);
}
};
#define BOOST_PP_ITERATION_PARAMS_1 (3, (3, BOOST_PROTO_MAX_ARITY, <boost/proto/transform/default.hpp>))
#include BOOST_PP_ITERATE()
#undef BOOST_PROTO_DEFAULT_EVAL_TYPE
#undef BOOST_PROTO_DEFAULT_EVAL
}
template<typename Grammar /*= detail::_default*/>
struct _default
: switch_<detail::default_cases<Grammar> >
{};
template<typename Grammar>
struct is_callable<_default<Grammar> >
: mpl::true_
{};
namespace detail
{
// Loopy indirection that allows proto::_default<> to be
// used without specifying a Grammar argument.
struct _default
: proto::_default<>
{};
}
}}
#endif
#else
#define N BOOST_PP_ITERATION()
template<typename Grammar, typename Expr, typename State, typename Data>
struct default_function_impl<Grammar, Expr, State, Data, N>
: transform_impl<Expr, State, Data>
{
BOOST_PP_REPEAT(N, BOOST_PROTO_DEFAULT_EVAL_TYPE, Expr)
typedef
typename proto::detail::result_of_fixup<r0>::type
function_type;
typedef
typename boost::tr1_result_of<
function_type(BOOST_PP_ENUM_SHIFTED_PARAMS(N, r))
>::type
result_type;
result_type operator ()(
typename default_function_impl::expr_param e
, typename default_function_impl::state_param s
, typename default_function_impl::data_param d
) const
{
return this->invoke(e, s, d, is_member_function_pointer<function_type>());
}
private:
result_type invoke(
typename default_function_impl::expr_param e
, typename default_function_impl::state_param s
, typename default_function_impl::data_param d
, mpl::false_
) const
{
return BOOST_PROTO_DEFAULT_EVAL(~, 0, e)(
BOOST_PP_ENUM_SHIFTED(N, BOOST_PROTO_DEFAULT_EVAL, e)
);
}
result_type invoke(
typename default_function_impl::expr_param e
, typename default_function_impl::state_param s
, typename default_function_impl::data_param d
, mpl::true_
) const
{
#define M0(Z, M, DATA) BOOST_PROTO_DEFAULT_EVAL(Z, BOOST_PP_ADD(M, 2), DATA)
BOOST_PROTO_USE_GET_POINTER();
typedef typename detail::classtypeof<function_type>::type class_type;
return (
BOOST_PROTO_GET_POINTER(class_type, BOOST_PROTO_DEFAULT_EVAL(~, 1, e)) ->*
BOOST_PROTO_DEFAULT_EVAL(~, 0, e)
)(BOOST_PP_ENUM(BOOST_PP_SUB(N, 2), M0, e));
#undef M0
}
};
#undef N
#endif
