435 lines
21 KiB
C++
435 lines
21 KiB
C++
#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/proto/detail/prefix.hpp> // must be first include
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#include <boost/config.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/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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#include <boost/proto/detail/suffix.hpp> // must be last include
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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 BOOST_PROTO_WHEN_BUILDING_DOCS(= typename Expr::proto_tag)
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, long Arity BOOST_PROTO_WHEN_BUILDING_DOCS(= Expr::proto_arity_c)
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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, 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_OP_RESULT(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_OP_RESULT(+, proto::tag::unary_plus, make)
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BOOST_PROTO_UNARY_OP_RESULT(-, proto::tag::negate, make)
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BOOST_PROTO_UNARY_OP_RESULT(*, proto::tag::dereference, make)
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BOOST_PROTO_UNARY_OP_RESULT(~, proto::tag::complement, make)
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BOOST_PROTO_UNARY_OP_RESULT(&, proto::tag::address_of, make)
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BOOST_PROTO_UNARY_OP_RESULT(!, proto::tag::logical_not, make)
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BOOST_PROTO_UNARY_OP_RESULT(++, proto::tag::pre_inc, make_mutable)
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BOOST_PROTO_UNARY_OP_RESULT(--, proto::tag::pre_dec, make_mutable)
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BOOST_PROTO_BINARY_OP_RESULT(<<, proto::tag::shift_left, make_mutable, make)
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BOOST_PROTO_BINARY_OP_RESULT(>>, proto::tag::shift_right, make_mutable, make)
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BOOST_PROTO_BINARY_OP_RESULT(*, proto::tag::multiplies, make, make)
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BOOST_PROTO_BINARY_OP_RESULT(/, proto::tag::divides, make, make)
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BOOST_PROTO_BINARY_OP_RESULT(%, proto::tag::modulus, make, make)
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BOOST_PROTO_BINARY_OP_RESULT(+, proto::tag::plus, make, make)
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BOOST_PROTO_BINARY_OP_RESULT(-, proto::tag::minus, make, make)
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BOOST_PROTO_BINARY_OP_RESULT(<, proto::tag::less, make, make)
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BOOST_PROTO_BINARY_OP_RESULT(>, proto::tag::greater, make, make)
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BOOST_PROTO_BINARY_OP_RESULT(<=, proto::tag::less_equal, make, make)
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BOOST_PROTO_BINARY_OP_RESULT(>=, proto::tag::greater_equal, make, make)
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BOOST_PROTO_BINARY_OP_RESULT(==, proto::tag::equal_to, make, make)
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BOOST_PROTO_BINARY_OP_RESULT(!=, proto::tag::not_equal_to, make, make)
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BOOST_PROTO_BINARY_OP_RESULT(||, proto::tag::logical_or, make, make)
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BOOST_PROTO_BINARY_OP_RESULT(&&, proto::tag::logical_and, make, make)
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BOOST_PROTO_BINARY_OP_RESULT(&, proto::tag::bitwise_and, make, make)
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BOOST_PROTO_BINARY_OP_RESULT(|, proto::tag::bitwise_or, make, make)
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BOOST_PROTO_BINARY_OP_RESULT(^, proto::tag::bitwise_xor, make, make)
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BOOST_PROTO_BINARY_OP_RESULT(=, proto::tag::assign, make_mutable, make)
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BOOST_PROTO_BINARY_OP_RESULT(<<=, proto::tag::shift_left_assign, make_mutable, make)
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BOOST_PROTO_BINARY_OP_RESULT(>>=, proto::tag::shift_right_assign, make_mutable, make)
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BOOST_PROTO_BINARY_OP_RESULT(*=, proto::tag::multiplies_assign, make_mutable, make)
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BOOST_PROTO_BINARY_OP_RESULT(/=, proto::tag::divides_assign, make_mutable, make)
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BOOST_PROTO_BINARY_OP_RESULT(%=, proto::tag::modulus_assign, make_mutable, make)
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BOOST_PROTO_BINARY_OP_RESULT(+=, proto::tag::plus_assign, make_mutable, make)
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BOOST_PROTO_BINARY_OP_RESULT(-=, proto::tag::minus_assign, make_mutable, make)
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BOOST_PROTO_BINARY_OP_RESULT(&=, proto::tag::bitwise_and_assign, make_mutable, make)
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BOOST_PROTO_BINARY_OP_RESULT(|=, proto::tag::bitwise_or_assign, make_mutable, make)
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BOOST_PROTO_BINARY_OP_RESULT(^=, proto::tag::bitwise_xor_assign, make_mutable, make)
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#undef BOOST_PROTO_UNARY_OP_RESULT
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#undef BOOST_PROTO_BINARY_OP_RESULT
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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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{
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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(e1), Context>::type r1;
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typedef typename remove_const<typename remove_reference<r1>::type>::type uncvref_r1;
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typedef typename is_member_function_pointer<uncvref_r1>::type type;
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BOOST_STATIC_CONSTANT(bool, value = type::value);
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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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template<typename Expr, typename Context, typename Tag>
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struct default_eval<Expr, Context, Tag, 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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// 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 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 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<EVAL_TYPE(~, 0, Expr)>::type
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function_type;
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typedef
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typename boost::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 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<EVAL_TYPE(~, 0, Expr)>::type
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function_type;
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typedef
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typename detail::result_of_<function_type(EVAL_TYPE(~, 1, Expr))>::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 EVAL(~, 0, expr)(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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using namespace detail::get_pointer_;
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return (get_pointer(EVAL(~, 1, expr)) ->* EVAL(~, 0, expr))();
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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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using namespace detail::get_pointer_;
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return (get_pointer(EVAL(~, 1, expr)) ->* EVAL(~, 0, expr));
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}
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};
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#define BOOST_PP_ITERATION_PARAMS_1 (3, (3, BOOST_PROTO_MAX_ARITY, <boost/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(N, 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 this->invoke(expr, context, is_member_function_pointer<function_type>());
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}
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private:
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result_type invoke(Expr &expr, Context &context, mpl::false_) const
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{
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return EVAL(~, 0, expr)(BOOST_PP_ENUM_SHIFTED(N, EVAL, expr));
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}
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result_type invoke(Expr &expr, Context &context, mpl::true_) const
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{
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#define M0(Z, M, expr) BOOST_PP_COMMA_IF(BOOST_PP_SUB(M, 2)) EVAL(Z, M, expr)
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using namespace detail::get_pointer_;
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return (get_pointer(EVAL(~, 1, expr)) ->* EVAL(~, 0, expr))(
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BOOST_PP_REPEAT_FROM_TO(2, N, M0, expr)
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);
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#undef M0
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}
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};
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#undef N
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#endif
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