410 lines
20 KiB
Plaintext
410 lines
20 KiB
Plaintext
///////////////////////////////////////////////////////////////////////////////
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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/config.hpp>
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#include <boost/preprocessor/arithmetic/add.hpp>
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#include <boost/preprocessor/arithmetic/sub.hpp>
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#include <boost/preprocessor/iteration/iterate.hpp>
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#include <boost/preprocessor/repetition/enum.hpp>
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#include <boost/preprocessor/repetition/enum_shifted.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/type_traits/is_member_pointer.hpp>
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#include <boost/type_traits/is_member_object_pointer.hpp>
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#include <boost/type_traits/is_member_function_pointer.hpp>
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#include <boost/proto/proto_fwd.hpp>
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#include <boost/proto/tags.hpp>
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#include <boost/proto/eval.hpp>
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#include <boost/proto/traits.hpp> // for proto::child_c()
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#include <boost/proto/detail/decltype.hpp>
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namespace boost { namespace proto
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{
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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 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 // = typename Expr::proto_tag
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, long Arity // = Expr::proto_arity_c
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>
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struct default_eval
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{};
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template<typename Expr, typename Context>
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struct default_eval<Expr, Context, tag::terminal, 0>
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{
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typedef
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typename proto::result_of::value<Expr &>::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::value(expr);
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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_UNARY_DEFAULT_EVAL(OP, TAG, MAKE) \
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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::child_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::child_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_DEFAULT_EVAL(OP, TAG, LMAKE, RMAKE) \
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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::child_c<Expr, 0>::type e0; \
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typedef typename proto::result_of::child_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_( \
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proto::detail::LMAKE<r0>() OP proto::detail::RMAKE<r1>() \
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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( \
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proto::child_c<0>(expr), ctx) OP proto::eval(proto::child_c<1>(expr) \
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, ctx \
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); \
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} \
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}; \
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/**/
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BOOST_PROTO_UNARY_DEFAULT_EVAL(+, proto::tag::unary_plus, make)
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BOOST_PROTO_UNARY_DEFAULT_EVAL(-, proto::tag::negate, make)
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BOOST_PROTO_UNARY_DEFAULT_EVAL(*, proto::tag::dereference, make)
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BOOST_PROTO_UNARY_DEFAULT_EVAL(~, proto::tag::complement, make)
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BOOST_PROTO_UNARY_DEFAULT_EVAL(&, proto::tag::address_of, make)
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BOOST_PROTO_UNARY_DEFAULT_EVAL(!, proto::tag::logical_not, make)
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BOOST_PROTO_UNARY_DEFAULT_EVAL(++, proto::tag::pre_inc, make_mutable)
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BOOST_PROTO_UNARY_DEFAULT_EVAL(--, proto::tag::pre_dec, make_mutable)
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BOOST_PROTO_BINARY_DEFAULT_EVAL(<<, proto::tag::shift_left, make_mutable, make)
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BOOST_PROTO_BINARY_DEFAULT_EVAL(>>, proto::tag::shift_right, make_mutable, make)
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BOOST_PROTO_BINARY_DEFAULT_EVAL(*, proto::tag::multiplies, make, make)
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BOOST_PROTO_BINARY_DEFAULT_EVAL(/, proto::tag::divides, make, make)
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BOOST_PROTO_BINARY_DEFAULT_EVAL(%, proto::tag::modulus, make, make)
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BOOST_PROTO_BINARY_DEFAULT_EVAL(+, proto::tag::plus, make, make)
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BOOST_PROTO_BINARY_DEFAULT_EVAL(-, proto::tag::minus, make, make)
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BOOST_PROTO_BINARY_DEFAULT_EVAL(<, proto::tag::less, make, make)
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BOOST_PROTO_BINARY_DEFAULT_EVAL(>, proto::tag::greater, make, make)
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BOOST_PROTO_BINARY_DEFAULT_EVAL(<=, proto::tag::less_equal, make, make)
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BOOST_PROTO_BINARY_DEFAULT_EVAL(>=, proto::tag::greater_equal, make, make)
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BOOST_PROTO_BINARY_DEFAULT_EVAL(==, proto::tag::equal_to, make, make)
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BOOST_PROTO_BINARY_DEFAULT_EVAL(!=, proto::tag::not_equal_to, make, make)
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BOOST_PROTO_BINARY_DEFAULT_EVAL(||, proto::tag::logical_or, make, make)
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BOOST_PROTO_BINARY_DEFAULT_EVAL(&&, proto::tag::logical_and, make, make)
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BOOST_PROTO_BINARY_DEFAULT_EVAL(&, proto::tag::bitwise_and, make, make)
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BOOST_PROTO_BINARY_DEFAULT_EVAL(|, proto::tag::bitwise_or, make, make)
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BOOST_PROTO_BINARY_DEFAULT_EVAL(^, proto::tag::bitwise_xor, make, make)
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BOOST_PROTO_BINARY_DEFAULT_EVAL(=, proto::tag::assign, make_mutable, make)
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BOOST_PROTO_BINARY_DEFAULT_EVAL(<<=, proto::tag::shift_left_assign, make_mutable, make)
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BOOST_PROTO_BINARY_DEFAULT_EVAL(>>=, proto::tag::shift_right_assign, make_mutable, make)
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BOOST_PROTO_BINARY_DEFAULT_EVAL(*=, proto::tag::multiplies_assign, make_mutable, make)
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BOOST_PROTO_BINARY_DEFAULT_EVAL(/=, proto::tag::divides_assign, make_mutable, make)
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BOOST_PROTO_BINARY_DEFAULT_EVAL(%=, proto::tag::modulus_assign, make_mutable, make)
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BOOST_PROTO_BINARY_DEFAULT_EVAL(+=, proto::tag::plus_assign, make_mutable, make)
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BOOST_PROTO_BINARY_DEFAULT_EVAL(-=, proto::tag::minus_assign, make_mutable, make)
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BOOST_PROTO_BINARY_DEFAULT_EVAL(&=, proto::tag::bitwise_and_assign, make_mutable, make)
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BOOST_PROTO_BINARY_DEFAULT_EVAL(|=, proto::tag::bitwise_or_assign, make_mutable, make)
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BOOST_PROTO_BINARY_DEFAULT_EVAL(^=, proto::tag::bitwise_xor_assign, make_mutable, make)
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#undef BOOST_PROTO_UNARY_DEFAULT_EVAL
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#undef BOOST_PROTO_BINARY_DEFAULT_EVAL
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/// INTERNAL ONLY
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template<typename Expr, typename Context>
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struct is_member_function_eval
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: is_member_function_pointer<
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typename detail::uncvref<
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typename proto::result_of::eval<
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typename remove_reference<
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typename proto::result_of::child_c<Expr, 1>::type
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>::type
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, Context
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>::type
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>::type
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>
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{};
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/// INTERNAL ONLY
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template<typename Expr, typename Context, bool IsMemFunCall>
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struct memfun_eval
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{
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private:
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typedef typename result_of::child_c<Expr, 0>::type e0;
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typedef typename result_of::child_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 detail::mem_ptr_fun<r0, r1>::result_type result_type;
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result_type operator ()(Expr &expr, Context &ctx) const
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{
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return detail::mem_ptr_fun<r0, r1>()(
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proto::eval(proto::child_c<0>(expr), ctx)
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, proto::eval(proto::child_c<1>(expr), ctx)
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);
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}
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};
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/// INTERNAL ONLY
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template<typename Expr, typename Context>
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struct memfun_eval<Expr, Context, true>
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{
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private:
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typedef typename result_of::child_c<Expr, 0>::type e0;
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typedef typename result_of::child_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 detail::memfun<r0, r1> result_type;
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result_type const operator ()(Expr &expr, Context &ctx) const
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{
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return detail::memfun<r0, r1>(
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proto::eval(proto::child_c<0>(expr), ctx)
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, proto::eval(proto::child_c<1>(expr), ctx)
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);
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}
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};
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template<typename Expr, typename Context>
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struct default_eval<Expr, Context, tag::mem_ptr, 2>
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: memfun_eval<Expr, Context, is_member_function_eval<Expr, Context>::value>
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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::child_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_mutable<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::child_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::child_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_mutable<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::child_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::child_c<Expr, 0>::type e0;
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typedef typename proto::result_of::child_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_subscriptable<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::child_c<0>(expr), ctx)[proto::eval(proto::child_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::child_c<Expr, 0>::type e0;
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typedef typename proto::result_of::child_c<Expr, 1>::type e1;
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typedef typename proto::result_of::child_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::child_c<0>(expr), ctx)
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? proto::eval(proto::child_c<1>(expr), ctx)
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: proto::eval(proto::child_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::child_c<Expr, 0>::type e0;
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typedef typename proto::result_of::child_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::child_c<0>(expr), ctx), proto::eval(proto::child_c<1>(expr), ctx);
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}
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};
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// Handle function specially
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#define BOOST_PROTO_DEFAULT_EVAL_TYPE(Z, N, DATA) \
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typename proto::result_of::eval< \
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typename remove_reference< \
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typename proto::result_of::child_c<DATA, N>::type \
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>::type \
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, Context \
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>::type \
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/**/
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#define BOOST_PROTO_DEFAULT_EVAL(Z, N, DATA) \
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proto::eval(proto::child_c<N>(DATA), context) \
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/**/
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template<typename Expr, typename Context>
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struct default_eval<Expr, Context, proto::tag::function, 1>
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{
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typedef
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typename proto::detail::result_of_fixup<
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BOOST_PROTO_DEFAULT_EVAL_TYPE(~, 0, Expr)
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>::type
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function_type;
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typedef
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typename BOOST_PROTO_RESULT_OF<function_type()>::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 BOOST_PROTO_DEFAULT_EVAL(~, 0, expr)();
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}
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};
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template<typename Expr, typename Context>
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struct default_eval<Expr, Context, proto::tag::function, 2>
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{
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typedef
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typename proto::detail::result_of_fixup<
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BOOST_PROTO_DEFAULT_EVAL_TYPE(~, 0, Expr)
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>::type
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function_type;
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typedef
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typename detail::result_of_<
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function_type(BOOST_PROTO_DEFAULT_EVAL_TYPE(~, 1, 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 this->invoke(
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expr
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, context
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, is_member_function_pointer<function_type>()
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, is_member_object_pointer<function_type>()
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);
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}
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private:
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result_type invoke(Expr &expr, Context &context, mpl::false_, mpl::false_) const
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{
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return BOOST_PROTO_DEFAULT_EVAL(~, 0, expr)(BOOST_PROTO_DEFAULT_EVAL(~, 1, expr));
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}
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result_type invoke(Expr &expr, Context &context, mpl::true_, mpl::false_) const
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{
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BOOST_PROTO_USE_GET_POINTER();
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typedef typename detail::class_member_traits<function_type>::class_type class_type;
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return (
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BOOST_PROTO_GET_POINTER(class_type, (BOOST_PROTO_DEFAULT_EVAL(~, 1, expr))) ->*
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BOOST_PROTO_DEFAULT_EVAL(~, 0, expr)
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)();
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}
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result_type invoke(Expr &expr, Context &context, mpl::false_, mpl::true_) const
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{
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BOOST_PROTO_USE_GET_POINTER();
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typedef typename detail::class_member_traits<function_type>::class_type class_type;
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return (
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BOOST_PROTO_GET_POINTER(class_type, (BOOST_PROTO_DEFAULT_EVAL(~, 1, expr))) ->*
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BOOST_PROTO_DEFAULT_EVAL(~, 0, expr)
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);
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}
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};
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// Additional specialization are generated by the preprocessor
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#include <boost/proto/context/detail/default_eval.hpp>
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#undef BOOST_PROTO_DEFAULT_EVAL_TYPE
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#undef BOOST_PROTO_DEFAULT_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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