395 lines
18 KiB
C++
Executable File
395 lines
18 KiB
C++
Executable File
#ifndef BOOST_PP_IS_ITERATING
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///////////////////////////////////////////////////////////////////////////////
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/// \file default.hpp
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/// Definintion of default_context, a default evaluation context for
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/// proto::eval() that uses Boost.Typeof to deduce return types
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/// of the built-in operators.
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//
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// Copyright 2008 Eric Niebler. Distributed under the Boost
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// Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_PROTO_CONTEXT_DEFAULT_HPP_EAN_01_08_2007
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#define BOOST_PROTO_CONTEXT_DEFAULT_HPP_EAN_01_08_2007
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#include <boost/xpressive/proto/detail/prefix.hpp> // must be first include
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#include <boost/config.hpp>
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#include <boost/preprocessor/cat.hpp>
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#include <boost/preprocessor/iteration/iterate.hpp>
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#include <boost/preprocessor/repetition/enum_shifted.hpp>
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#include <boost/preprocessor/selection/max.hpp>
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#include <boost/mpl/if.hpp>
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#include <boost/typeof/typeof.hpp>
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#include <boost/utility/result_of.hpp>
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#include <boost/type_traits/is_const.hpp>
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#include <boost/type_traits/is_function.hpp>
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#include <boost/type_traits/remove_reference.hpp>
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#include <boost/xpressive/proto/proto_fwd.hpp>
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#include <boost/xpressive/proto/tags.hpp>
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#include <boost/xpressive/proto/eval.hpp>
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#include <boost/xpressive/proto/traits.hpp> // for proto::arg_c()
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#include <boost/xpressive/proto/detail/suffix.hpp> // must be last include
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namespace boost { namespace proto
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{
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// If we're generating doxygen documentation, hide all the nasty
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// Boost.Typeof gunk.
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#ifndef BOOST_PROTO_DOXYGEN_INVOKED
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#define BOOST_PROTO_DECLTYPE_NESTED_TYPEDEF_TPL_(Nested, Expr)\
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BOOST_TYPEOF_NESTED_TYPEDEF_TPL(BOOST_PP_CAT(nested_and_hidden_, Nested), Expr)\
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static int const sz = sizeof(proto::detail::check_reference(Expr));\
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struct Nested\
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: mpl::if_c<\
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1==sz\
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, typename BOOST_PP_CAT(nested_and_hidden_, Nested)::type &\
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, typename BOOST_PP_CAT(nested_and_hidden_, Nested)::type\
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>\
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{};
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#define BOOST_PROTO_DECLTYPE_(Expr, Type)\
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BOOST_PROTO_DECLTYPE_NESTED_TYPEDEF_TPL_(BOOST_PP_CAT(nested_, Type), (Expr))\
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typedef typename BOOST_PP_CAT(nested_, Type)::type Type;
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#else
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/// INTERNAL ONLY
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///
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#define BOOST_PROTO_DECLTYPE_NESTED_TYPEDEF_TPL_(Nested, Expr)
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/// INTERNAL ONLY
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///
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#define BOOST_PROTO_DECLTYPE_(Expr, Type)\
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typedef detail::unspecified Type;
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#endif
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/// INTERNAL ONLY
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///
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#define UNREF(x) typename boost::remove_reference<x>::type
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namespace detail
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{
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template<typename T> T make();
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template<typename T>
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char check_reference(T &);
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template<typename T>
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char (&check_reference(T const &))[2];
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template<typename A0, typename A1>
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struct comma_result
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{
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BOOST_PROTO_DECLTYPE_((proto::detail::make<A0>(), proto::detail::make<A1>()), type)
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};
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template<typename A0>
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struct comma_result<A0, void>
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{
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typedef void type;
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};
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template<typename A1>
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struct comma_result<void, A1>
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{
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typedef A1 type;
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};
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template<>
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struct comma_result<void, void>
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{
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typedef void type;
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};
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template<typename T, typename U = T>
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struct result_of_fixup
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: mpl::if_<is_function<T>, T *, U>
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{};
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template<typename T, typename U>
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struct result_of_fixup<T &, U>
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: result_of_fixup<T, T>
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{};
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template<typename T, typename U>
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struct result_of_fixup<T *, U>
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: result_of_fixup<T, U>
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{};
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template<typename T, typename U>
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struct result_of_fixup<T const, U>
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: result_of_fixup<T, U>
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{};
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//// Tests for result_of_fixup
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//struct bar {};
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//BOOST_MPL_ASSERT((is_same<bar, result_of_fixup<bar>::type>));
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//BOOST_MPL_ASSERT((is_same<bar const, result_of_fixup<bar const>::type>));
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//BOOST_MPL_ASSERT((is_same<bar, result_of_fixup<bar &>::type>));
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//BOOST_MPL_ASSERT((is_same<bar const, result_of_fixup<bar const &>::type>));
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//BOOST_MPL_ASSERT((is_same<void(*)(), result_of_fixup<void(*)()>::type>));
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//BOOST_MPL_ASSERT((is_same<void(*)(), result_of_fixup<void(* const)()>::type>));
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//BOOST_MPL_ASSERT((is_same<void(*)(), result_of_fixup<void(* const &)()>::type>));
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//BOOST_MPL_ASSERT((is_same<void(*)(), result_of_fixup<void(&)()>::type>));
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} // namespace detail
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namespace context
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{
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template<
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typename Expr
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, typename Context
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, typename Tag BOOST_PROTO_FOR_DOXYGEN_ONLY(= typename Expr::proto_tag)
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, long Arity BOOST_PROTO_FOR_DOXYGEN_ONLY(= Expr::proto_arity::value)
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>
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struct default_eval
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{};
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/// INTERNAL ONLY
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///
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#define BOOST_PROTO_UNARY_OP_RESULT(Op, Tag) \
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template<typename Expr, typename Context> \
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struct default_eval<Expr, Context, Tag, 1> \
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{ \
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private: \
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typedef typename proto::result_of::arg_c<Expr, 0>::type e0; \
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typedef typename proto::result_of::eval<UNREF(e0), Context>::type r0; \
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public: \
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BOOST_PROTO_DECLTYPE_(Op proto::detail::make<r0>(), result_type) \
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result_type operator ()(Expr &expr, Context &ctx) const \
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{ \
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return Op proto::eval(proto::arg_c<0>(expr), ctx); \
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} \
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}; \
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/**/
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/// INTERNAL ONLY
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///
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#define BOOST_PROTO_BINARY_OP_RESULT(Op, Tag) \
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template<typename Expr, typename Context> \
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struct default_eval<Expr, Context, Tag, 2> \
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{ \
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private: \
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typedef typename proto::result_of::arg_c<Expr, 0>::type e0; \
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typedef typename proto::result_of::arg_c<Expr, 1>::type e1; \
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typedef typename proto::result_of::eval<UNREF(e0), Context>::type r0; \
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typedef typename proto::result_of::eval<UNREF(e1), Context>::type r1; \
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public: \
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BOOST_PROTO_DECLTYPE_(proto::detail::make<r0>() Op proto::detail::make<r1>(), result_type)\
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result_type operator ()(Expr &expr, Context &ctx) const \
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{ \
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return proto::eval(proto::arg_c<0>(expr), ctx) Op proto::eval(proto::arg_c<1>(expr), ctx);\
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} \
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}; \
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/**/
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BOOST_PROTO_UNARY_OP_RESULT(+, proto::tag::posit)
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BOOST_PROTO_UNARY_OP_RESULT(-, proto::tag::negate)
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BOOST_PROTO_UNARY_OP_RESULT(*, proto::tag::dereference)
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BOOST_PROTO_UNARY_OP_RESULT(~, proto::tag::complement)
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BOOST_PROTO_UNARY_OP_RESULT(&, proto::tag::address_of)
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BOOST_PROTO_UNARY_OP_RESULT(!, proto::tag::logical_not)
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BOOST_PROTO_UNARY_OP_RESULT(++, proto::tag::pre_inc)
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BOOST_PROTO_UNARY_OP_RESULT(--, proto::tag::pre_dec)
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BOOST_PROTO_BINARY_OP_RESULT(<<, proto::tag::shift_left)
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BOOST_PROTO_BINARY_OP_RESULT(>>, proto::tag::shift_right)
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BOOST_PROTO_BINARY_OP_RESULT(*, proto::tag::multiplies)
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BOOST_PROTO_BINARY_OP_RESULT(/, proto::tag::divides)
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BOOST_PROTO_BINARY_OP_RESULT(%, proto::tag::modulus)
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BOOST_PROTO_BINARY_OP_RESULT(+, proto::tag::plus)
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BOOST_PROTO_BINARY_OP_RESULT(-, proto::tag::minus)
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BOOST_PROTO_BINARY_OP_RESULT(<, proto::tag::less)
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BOOST_PROTO_BINARY_OP_RESULT(>, proto::tag::greater)
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BOOST_PROTO_BINARY_OP_RESULT(<=, proto::tag::less_equal)
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BOOST_PROTO_BINARY_OP_RESULT(>=, proto::tag::greater_equal)
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BOOST_PROTO_BINARY_OP_RESULT(==, proto::tag::equal_to)
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BOOST_PROTO_BINARY_OP_RESULT(!=, proto::tag::not_equal_to)
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BOOST_PROTO_BINARY_OP_RESULT(||, proto::tag::logical_or)
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BOOST_PROTO_BINARY_OP_RESULT(&&, proto::tag::logical_and)
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BOOST_PROTO_BINARY_OP_RESULT(&, proto::tag::bitwise_and)
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BOOST_PROTO_BINARY_OP_RESULT(|, proto::tag::bitwise_or)
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BOOST_PROTO_BINARY_OP_RESULT(^, proto::tag::bitwise_xor)
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BOOST_PROTO_BINARY_OP_RESULT(->*, proto::tag::mem_ptr)
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BOOST_PROTO_BINARY_OP_RESULT(=, proto::tag::assign)
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BOOST_PROTO_BINARY_OP_RESULT(<<=, proto::tag::shift_left_assign)
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BOOST_PROTO_BINARY_OP_RESULT(>>=, proto::tag::shift_right_assign)
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BOOST_PROTO_BINARY_OP_RESULT(*=, proto::tag::multiplies_assign)
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BOOST_PROTO_BINARY_OP_RESULT(/=, proto::tag::divides_assign)
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BOOST_PROTO_BINARY_OP_RESULT(%=, proto::tag::modulus_assign)
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BOOST_PROTO_BINARY_OP_RESULT(+=, proto::tag::plus_assign)
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BOOST_PROTO_BINARY_OP_RESULT(-=, proto::tag::minus_assign)
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BOOST_PROTO_BINARY_OP_RESULT(&=, proto::tag::bitwise_and_assign)
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BOOST_PROTO_BINARY_OP_RESULT(|=, proto::tag::bitwise_or_assign)
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BOOST_PROTO_BINARY_OP_RESULT(^=, proto::tag::bitwise_xor_assign)
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#undef BOOST_PROTO_UNARY_OP_RESULT
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#undef BOOST_PROTO_BINARY_OP_RESULT
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template<typename Expr, typename Context>
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struct default_eval<Expr, Context, proto::tag::terminal, 0>
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{
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typedef
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typename mpl::if_<
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is_const<Expr>
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, typename proto::result_of::arg<Expr>::const_reference
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, typename proto::result_of::arg<Expr>::reference
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>::type
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result_type;
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result_type operator ()(Expr &expr, Context &) const
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{
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return proto::arg(expr);
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}
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};
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// Handle post-increment specially.
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template<typename Expr, typename Context>
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struct default_eval<Expr, Context, proto::tag::post_inc, 1>
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{
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private:
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typedef typename proto::result_of::arg_c<Expr, 0>::type e0;
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typedef typename proto::result_of::eval<UNREF(e0), Context>::type r0;
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public:
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BOOST_PROTO_DECLTYPE_(proto::detail::make<r0>() ++, result_type)
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result_type operator ()(Expr &expr, Context &ctx) const
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{
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return proto::eval(proto::arg_c<0>(expr), ctx) ++;
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}
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};
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// Handle post-decrement specially.
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template<typename Expr, typename Context>
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struct default_eval<Expr, Context, proto::tag::post_dec, 1>
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{
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private:
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typedef typename proto::result_of::arg_c<Expr, 0>::type e0;
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typedef typename proto::result_of::eval<UNREF(e0), Context>::type r0;
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public:
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BOOST_PROTO_DECLTYPE_(proto::detail::make<r0>() --, result_type)
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result_type operator ()(Expr &expr, Context &ctx) const
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{
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return proto::eval(proto::arg_c<0>(expr), ctx) --;
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}
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};
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// Handle subscript specially.
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template<typename Expr, typename Context>
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struct default_eval<Expr, Context, proto::tag::subscript, 2>
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{
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private:
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typedef typename proto::result_of::arg_c<Expr, 0>::type e0;
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typedef typename proto::result_of::arg_c<Expr, 1>::type e1;
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typedef typename proto::result_of::eval<UNREF(e0), Context>::type r0;
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typedef typename proto::result_of::eval<UNREF(e1), Context>::type r1;
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public:
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BOOST_PROTO_DECLTYPE_(proto::detail::make<r0>()[proto::detail::make<r1>()], result_type)
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result_type operator ()(Expr &expr, Context &ctx) const
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{
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return proto::eval(proto::arg_c<0>(expr), ctx)[proto::eval(proto::arg_c<1>(expr), ctx)];
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}
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};
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// Handle if_else_ specially.
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template<typename Expr, typename Context>
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struct default_eval<Expr, Context, proto::tag::if_else_, 3>
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{
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private:
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typedef typename proto::result_of::arg_c<Expr, 0>::type e0;
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typedef typename proto::result_of::arg_c<Expr, 1>::type e1;
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typedef typename proto::result_of::arg_c<Expr, 2>::type e2;
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typedef typename proto::result_of::eval<UNREF(e0), Context>::type r0;
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typedef typename proto::result_of::eval<UNREF(e1), Context>::type r1;
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typedef typename proto::result_of::eval<UNREF(e2), Context>::type r2;
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public:
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BOOST_PROTO_DECLTYPE_(
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proto::detail::make<r0>()
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? proto::detail::make<r1>()
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: proto::detail::make<r2>()
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, result_type
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)
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result_type operator ()(Expr &expr, Context &ctx) const
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{
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return proto::eval(proto::arg_c<0>(expr), ctx)
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? proto::eval(proto::arg_c<1>(expr), ctx)
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: proto::eval(proto::arg_c<2>(expr), ctx);
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}
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};
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// Handle comma specially.
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template<typename Expr, typename Context>
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struct default_eval<Expr, Context, proto::tag::comma, 2>
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{
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private:
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typedef typename proto::result_of::arg_c<Expr, 0>::type e0;
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typedef typename proto::result_of::arg_c<Expr, 1>::type e1;
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typedef typename proto::result_of::eval<UNREF(e0), Context>::type r0;
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typedef typename proto::result_of::eval<UNREF(e1), Context>::type r1;
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public:
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typedef typename proto::detail::comma_result<r0, r1>::type result_type;
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result_type operator ()(Expr &expr, Context &ctx) const
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{
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return proto::eval(proto::arg_c<0>(expr), ctx), proto::eval(proto::arg_c<1>(expr), ctx);
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}
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};
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// Handle function specially
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#define EVAL_TYPE(Z, N, DATA) \
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typename proto::result_of::eval< \
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typename remove_reference<typename proto::result_of::arg_c<DATA, N>::type>::type\
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, Context \
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>::type
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#define EVAL(Z, N, DATA) \
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proto::eval(proto::arg_c<N>(DATA), context)
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#define BOOST_PP_ITERATION_PARAMS_1 (3, (0, BOOST_PROTO_MAX_ARITY, <boost/xpressive/proto/context/default.hpp>))
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#include BOOST_PP_ITERATE()
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#undef EVAL_TYPE
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#undef EVAL
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/// default_context
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///
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struct default_context
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{
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/// default_context::eval
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///
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template<typename Expr, typename ThisContext = default_context const>
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struct eval
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: default_eval<Expr, ThisContext>
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{};
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};
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} // namespace context
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}} // namespace boost::proto
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#undef UNREF
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#endif
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#else
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#define N BOOST_PP_ITERATION()
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template<typename Expr, typename Context>
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struct default_eval<Expr, Context, proto::tag::function, N>
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{
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typedef
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typename proto::detail::result_of_fixup<EVAL_TYPE(~, 0, Expr)>::type
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function_type;
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typedef
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typename boost::result_of<
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function_type(BOOST_PP_ENUM_SHIFTED(BOOST_PP_MAX(N, 1), EVAL_TYPE, Expr))
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>::type
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result_type;
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result_type operator ()(Expr &expr, Context &context) const
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{
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return EVAL(~, 0, expr)(BOOST_PP_ENUM_SHIFTED(BOOST_PP_MAX(N, 1), EVAL, expr));
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}
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};
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#undef N
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#endif
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