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598 lines
28 KiB
598 lines
28 KiB
/////////////////////////////////////////////////////////////////////////////// |
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/// \file default.hpp |
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/// Contains definition of the _default transform, which gives operators their |
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/// usual C++ meanings and uses Boost.Typeof to deduce return types. |
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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_TRANSFORM_DEFAULT_HPP_EAN_04_04_2008 |
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#define BOOST_PROTO_TRANSFORM_DEFAULT_HPP_EAN_04_04_2008 |
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#include <boost/preprocessor/iteration/iterate.hpp> |
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#include <boost/preprocessor/repetition/repeat.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/repetition/enum.hpp> |
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#include <boost/preprocessor/repetition/enum_shifted.hpp> |
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#include <boost/preprocessor/repetition/enum_shifted_params.hpp> |
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#include <boost/ref.hpp> |
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#include <boost/get_pointer.hpp> |
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#include <boost/utility/enable_if.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/traits.hpp> |
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#include <boost/proto/transform/impl.hpp> |
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#include <boost/proto/transform/arg.hpp> |
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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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namespace detail |
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{ |
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template<typename Grammar, typename Tag> |
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struct default_case |
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: not_<_> |
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{}; |
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template<typename Grammar> |
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struct default_case<Grammar, tag::terminal> |
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: when<terminal<_>, _value> |
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{}; |
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template<typename Grammar> |
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struct default_cases |
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{ |
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template<typename Tag> |
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struct case_ |
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: default_case<Grammar, Tag> |
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{}; |
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}; |
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#define BOOST_PROTO_UNARY_DEFAULT_EVAL(OP, TAG, MAKE) \ |
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template<typename Grammar> \ |
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struct BOOST_PP_CAT(default_, TAG) \ |
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: transform<BOOST_PP_CAT(default_, TAG)<Grammar> > \ |
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{ \ |
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template<typename Expr, typename State, typename Data> \ |
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struct impl \ |
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: transform_impl<Expr, State, Data> \ |
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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 Grammar::template impl<e0, State, Data>::result_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 ()( \ |
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typename impl::expr_param e \ |
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, typename impl::state_param s \ |
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, typename impl::data_param d \ |
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) const \ |
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{ \ |
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typename Grammar::template impl<e0, State, Data> t0; \ |
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return OP t0(proto::child_c<0>(e), s, d); \ |
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} \ |
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}; \ |
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}; \ |
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\ |
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template<typename Grammar> \ |
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struct default_case<Grammar, tag::TAG> \ |
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: when<unary_expr<tag::TAG, Grammar>, BOOST_PP_CAT(default_, TAG)<Grammar> > \ |
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{}; \ |
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/**/ |
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|
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#define BOOST_PROTO_BINARY_DEFAULT_EVAL(OP, TAG, LMAKE, RMAKE) \ |
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template<typename Grammar> \ |
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struct BOOST_PP_CAT(default_, TAG) \ |
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: transform<BOOST_PP_CAT(default_, TAG)<Grammar> > \ |
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{ \ |
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template<typename Expr, typename State, typename Data> \ |
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struct impl \ |
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: transform_impl<Expr, State, Data> \ |
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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 Grammar::template impl<e0, State, Data>::result_type r0; \ |
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typedef typename Grammar::template impl<e1, State, Data>::result_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 ()( \ |
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typename impl::expr_param e \ |
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, typename impl::state_param s \ |
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, typename impl::data_param d \ |
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) const \ |
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{ \ |
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typename Grammar::template impl<e0, State, Data> t0; \ |
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typename Grammar::template impl<e1, State, Data> t1; \ |
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return t0(proto::child_c<0>(e), s, d) \ |
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OP t1(proto::child_c<1>(e), s, d); \ |
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} \ |
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}; \ |
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}; \ |
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\ |
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template<typename Grammar> \ |
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struct default_case<Grammar, tag::TAG> \ |
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: when<binary_expr<tag::TAG, Grammar, Grammar>, BOOST_PP_CAT(default_, TAG)<Grammar> > \ |
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{}; \ |
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/**/ |
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BOOST_PROTO_UNARY_DEFAULT_EVAL(+, unary_plus, make) |
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BOOST_PROTO_UNARY_DEFAULT_EVAL(-, negate, make) |
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BOOST_PROTO_UNARY_DEFAULT_EVAL(*, dereference, make) |
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BOOST_PROTO_UNARY_DEFAULT_EVAL(~, complement, make) |
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BOOST_PROTO_UNARY_DEFAULT_EVAL(&, address_of, make) |
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BOOST_PROTO_UNARY_DEFAULT_EVAL(!, logical_not, make) |
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BOOST_PROTO_UNARY_DEFAULT_EVAL(++, pre_inc, make_mutable) |
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BOOST_PROTO_UNARY_DEFAULT_EVAL(--, pre_dec, make_mutable) |
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BOOST_PROTO_BINARY_DEFAULT_EVAL(<<, shift_left, make_mutable, make) |
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BOOST_PROTO_BINARY_DEFAULT_EVAL(>>, shift_right, make_mutable, make_mutable) |
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BOOST_PROTO_BINARY_DEFAULT_EVAL(*, multiplies, make, make) |
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BOOST_PROTO_BINARY_DEFAULT_EVAL(/, divides, make, make) |
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BOOST_PROTO_BINARY_DEFAULT_EVAL(%, modulus, make, make) |
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BOOST_PROTO_BINARY_DEFAULT_EVAL(+, plus, make, make) |
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BOOST_PROTO_BINARY_DEFAULT_EVAL(-, minus, make, make) |
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BOOST_PROTO_BINARY_DEFAULT_EVAL(<, less, make, make) |
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BOOST_PROTO_BINARY_DEFAULT_EVAL(>, greater, make, make) |
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BOOST_PROTO_BINARY_DEFAULT_EVAL(<=, less_equal, make, make) |
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BOOST_PROTO_BINARY_DEFAULT_EVAL(>=, greater_equal, make, make) |
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BOOST_PROTO_BINARY_DEFAULT_EVAL(==, equal_to, make, make) |
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BOOST_PROTO_BINARY_DEFAULT_EVAL(!=, not_equal_to, make, make) |
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BOOST_PROTO_BINARY_DEFAULT_EVAL(||, logical_or, make, make) |
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BOOST_PROTO_BINARY_DEFAULT_EVAL(&&, logical_and, make, make) |
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BOOST_PROTO_BINARY_DEFAULT_EVAL(&, bitwise_and, make, make) |
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BOOST_PROTO_BINARY_DEFAULT_EVAL(|, bitwise_or, make, make) |
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BOOST_PROTO_BINARY_DEFAULT_EVAL(^, bitwise_xor, make, make) |
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BOOST_PROTO_BINARY_DEFAULT_EVAL(=, assign, make_mutable, make) |
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BOOST_PROTO_BINARY_DEFAULT_EVAL(<<=, shift_left_assign, make_mutable, make) |
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BOOST_PROTO_BINARY_DEFAULT_EVAL(>>=, shift_right_assign, make_mutable, make) |
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BOOST_PROTO_BINARY_DEFAULT_EVAL(*=, multiplies_assign, make_mutable, make) |
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BOOST_PROTO_BINARY_DEFAULT_EVAL(/=, divides_assign, make_mutable, make) |
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BOOST_PROTO_BINARY_DEFAULT_EVAL(%=, modulus_assign, make_mutable, make) |
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BOOST_PROTO_BINARY_DEFAULT_EVAL(+=, plus_assign, make_mutable, make) |
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BOOST_PROTO_BINARY_DEFAULT_EVAL(-=, minus_assign, make_mutable, make) |
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BOOST_PROTO_BINARY_DEFAULT_EVAL(&=, bitwise_and_assign, make_mutable, make) |
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BOOST_PROTO_BINARY_DEFAULT_EVAL(|=, bitwise_or_assign, make_mutable, make) |
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BOOST_PROTO_BINARY_DEFAULT_EVAL(^=, 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 Grammar, typename Expr, typename State, typename Data> |
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struct is_member_function_invocation |
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: is_member_function_pointer< |
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typename uncvref< |
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typename Grammar::template impl< |
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typename result_of::child_c<Expr, 1>::type |
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, State |
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, Data |
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>::result_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 Grammar, typename Expr, typename State, typename Data, bool IsMemFunCall> |
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struct default_mem_ptr_impl |
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: transform_impl<Expr, State, Data> |
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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 Grammar::template impl<e0, State, Data>::result_type r0; |
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typedef typename Grammar::template impl<e1, State, Data>::result_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 ()( |
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typename default_mem_ptr_impl::expr_param e |
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, typename default_mem_ptr_impl::state_param s |
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, typename default_mem_ptr_impl::data_param d |
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) const |
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{ |
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typename Grammar::template impl<e0, State, Data> t0; |
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typename Grammar::template impl<e1, State, Data> t1; |
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return detail::mem_ptr_fun<r0, r1>()( |
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t0(proto::child_c<0>(e), s, d) |
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, t1(proto::child_c<1>(e), s, d) |
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); |
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} |
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}; |
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/// INTERNAL ONLY |
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template<typename Grammar, typename Expr, typename State, typename Data> |
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struct default_mem_ptr_impl<Grammar, Expr, State, Data, true> |
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: transform_impl<Expr, State, Data> |
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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 Grammar::template impl<e0, State, Data>::result_type r0; |
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typedef typename Grammar::template impl<e1, State, Data>::result_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 ()( |
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typename default_mem_ptr_impl::expr_param e |
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, typename default_mem_ptr_impl::state_param s |
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, typename default_mem_ptr_impl::data_param d |
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) const |
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{ |
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typename Grammar::template impl<e0, State, Data> t0; |
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typename Grammar::template impl<e1, State, Data> t1; |
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return detail::memfun<r0, r1>( |
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t0(proto::child_c<0>(e), s, d) |
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, t1(proto::child_c<1>(e), s, d) |
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); |
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} |
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}; |
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template<typename Grammar> |
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struct default_mem_ptr |
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: transform<default_mem_ptr<Grammar> > |
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{ |
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template<typename Expr, typename State, typename Data> |
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struct impl |
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: default_mem_ptr_impl< |
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Grammar |
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, Expr |
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, State |
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, Data |
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, is_member_function_invocation<Grammar, Expr, State, Data>::value |
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> |
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{}; |
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}; |
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template<typename Grammar> |
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struct default_case<Grammar, tag::mem_ptr> |
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: when<mem_ptr<Grammar, Grammar>, default_mem_ptr<Grammar> > |
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{}; |
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template<typename Grammar> |
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struct default_post_inc |
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: transform<default_post_inc<Grammar> > |
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{ |
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template<typename Expr, typename State, typename Data> |
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struct impl |
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: transform_impl<Expr, State, Data> |
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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 Grammar::template impl<e0, State, Data>::result_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 ()( |
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typename impl::expr_param e |
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, typename impl::state_param s |
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, typename impl::data_param d |
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) const |
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{ |
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typename Grammar::template impl<e0, State, Data> t0; |
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return t0(proto::child_c<0>(e), s, d) ++; |
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} |
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}; |
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}; |
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template<typename Grammar> |
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struct default_case<Grammar, tag::post_inc> |
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: when<post_inc<Grammar>, default_post_inc<Grammar> > |
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{}; |
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template<typename Grammar> |
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struct default_post_dec |
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: transform<default_post_dec<Grammar> > |
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{ |
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template<typename Expr, typename State, typename Data> |
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struct impl |
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: transform_impl<Expr, State, Data> |
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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 Grammar::template impl<e0, State, Data>::result_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 ()( |
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typename impl::expr_param e |
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, typename impl::state_param s |
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, typename impl::data_param d |
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) const |
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{ |
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typename Grammar::template impl<e0, State, Data> t0; |
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return t0(proto::child_c<0>(e), s, d) --; |
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} |
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}; |
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}; |
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template<typename Grammar> |
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struct default_case<Grammar, tag::post_dec> |
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: when<post_dec<Grammar>, default_post_dec<Grammar> > |
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{}; |
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template<typename Grammar> |
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struct default_subscript |
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: transform<default_subscript<Grammar> > |
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{ |
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template<typename Expr, typename State, typename Data> |
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struct impl |
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: transform_impl<Expr, State, Data> |
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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 Grammar::template impl<e0, State, Data>::result_type r0; |
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typedef typename Grammar::template impl<e1, State, Data>::result_type r1; |
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public: |
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BOOST_PROTO_DECLTYPE_( |
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proto::detail::make_subscriptable<r0>() [ proto::detail::make<r1>() ] |
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, result_type |
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) |
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result_type operator ()( |
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typename impl::expr_param e |
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, typename impl::state_param s |
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, typename impl::data_param d |
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) const |
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{ |
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typename Grammar::template impl<e0, State, Data> t0; |
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typename Grammar::template impl<e1, State, Data> t1; |
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return t0(proto::child_c<0>(e), s, d) [ |
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t1(proto::child_c<1>(e), s, d) ]; |
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} |
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}; |
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}; |
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template<typename Grammar> |
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struct default_case<Grammar, tag::subscript> |
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: when<subscript<Grammar, Grammar>, default_subscript<Grammar> > |
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{}; |
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template<typename Grammar> |
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struct default_if_else_ |
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{ |
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template<typename Expr, typename State, typename Data> |
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struct impl |
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: transform_impl<Expr, State, Data> |
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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 result_of::child_c<Expr, 2>::type e2; |
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typedef typename Grammar::template impl<e0, State, Data>::result_type r0; |
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typedef typename Grammar::template impl<e1, State, Data>::result_type r1; |
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typedef typename Grammar::template impl<e2, State, Data>::result_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 ()( |
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typename impl::expr_param e |
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, typename impl::state_param s |
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, typename impl::data_param d |
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) const |
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{ |
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typename Grammar::template impl<e0, State, Data> t0; |
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typename Grammar::template impl<e1, State, Data> t1; |
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typename Grammar::template impl<e2, State, Data> t2; |
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return t0(proto::child_c<0>(e), s, d) |
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? t1(proto::child_c<1>(e), s, d) |
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: t2(proto::child_c<2>(e), s, d); |
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} |
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}; |
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}; |
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template<typename Grammar> |
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struct default_case<Grammar, tag::if_else_> |
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: when<if_else_<Grammar, Grammar, Grammar>, default_if_else_<Grammar> > |
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{}; |
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template<typename Grammar> |
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struct default_comma |
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: transform<default_comma<Grammar> > |
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{ |
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template<typename Expr, typename State, typename Data> |
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struct impl |
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: transform_impl<Expr, State, Data> |
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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 Grammar::template impl<e0, State, Data>::result_type r0; |
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typedef typename Grammar::template impl<e1, State, Data>::result_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 ()( |
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typename impl::expr_param e |
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, typename impl::state_param s |
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, typename impl::data_param d |
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) const |
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{ |
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typename Grammar::template impl<e0, State, Data> t0; |
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typename Grammar::template impl<e1, State, Data> t1; |
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return t0(proto::child_c<0>(e), s, d) |
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, t1(proto::child_c<1>(e), s, d); |
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} |
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}; |
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}; |
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template<typename Grammar> |
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struct default_case<Grammar, tag::comma> |
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: when<comma<Grammar, Grammar>, default_comma<Grammar> > |
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{}; |
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template<typename Grammar, typename Expr, typename State, typename Data, long Arity> |
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struct default_function_impl; |
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template<typename Grammar> |
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struct default_function |
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: transform<default_function<Grammar> > |
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{ |
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template<typename Expr, typename State, typename Data> |
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struct impl |
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: default_function_impl< |
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Grammar |
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, Expr |
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, State |
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, Data |
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, transform_impl<Expr, State, Data>::expr::proto_arity_c |
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> |
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{}; |
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}; |
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template<typename Grammar> |
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struct default_case<Grammar, tag::function> |
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: when<function<Grammar, vararg<Grammar> >, default_function<Grammar> > |
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{}; |
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#define BOOST_PROTO_DEFAULT_EVAL_TYPE(Z, N, DATA) \ |
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typedef \ |
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typename result_of::child_c<DATA, N>::type \ |
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BOOST_PP_CAT(e, N); \ |
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\ |
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typedef \ |
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typename Grammar::template impl<BOOST_PP_CAT(e, N), State, Data>::result_type \ |
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BOOST_PP_CAT(r, N); \ |
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/**/ |
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|
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#define BOOST_PROTO_DEFAULT_EVAL(Z, N, DATA) \ |
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typename Grammar::template impl<BOOST_PP_CAT(e, N), State, Data>()( \ |
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proto::child_c<N>(DATA), s, d \ |
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) \ |
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/**/ |
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|
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template<typename Grammar, typename Expr, typename State, typename Data> |
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struct default_function_impl<Grammar, Expr, State, Data, 1> |
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: transform_impl<Expr, State, Data> |
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{ |
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BOOST_PROTO_DEFAULT_EVAL_TYPE(~, 0, Expr) |
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|
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typedef |
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typename proto::detail::result_of_fixup<r0>::type |
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function_type; |
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|
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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 ()( |
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typename default_function_impl::expr_param e |
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, typename default_function_impl::state_param s |
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, typename default_function_impl::data_param d |
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) const |
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{ |
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return BOOST_PROTO_DEFAULT_EVAL(~, 0, e)(); |
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} |
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}; |
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template<typename Grammar, typename Expr, typename State, typename Data> |
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struct default_function_impl<Grammar, Expr, State, Data, 2> |
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: transform_impl<Expr, State, Data> |
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{ |
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BOOST_PROTO_DEFAULT_EVAL_TYPE(~, 0, Expr) |
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BOOST_PROTO_DEFAULT_EVAL_TYPE(~, 1, Expr) |
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|
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typedef |
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typename proto::detail::result_of_fixup<r0>::type |
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function_type; |
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|
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typedef |
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typename detail::result_of_<function_type(r1)>::type |
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result_type; |
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|
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result_type operator ()( |
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typename default_function_impl::expr_param e |
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, typename default_function_impl::state_param s |
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, typename default_function_impl::data_param d |
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) const |
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{ |
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return this->invoke( |
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e |
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, s |
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, d |
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, is_member_function_pointer<function_type>() |
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, is_member_object_pointer<function_type>() |
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); |
|
} |
|
|
|
private: |
|
result_type invoke( |
|
typename default_function_impl::expr_param e |
|
, typename default_function_impl::state_param s |
|
, typename default_function_impl::data_param d |
|
, mpl::false_ |
|
, mpl::false_ |
|
) const |
|
{ |
|
return BOOST_PROTO_DEFAULT_EVAL(~, 0, e)(BOOST_PROTO_DEFAULT_EVAL(~, 1, e)); |
|
} |
|
|
|
result_type invoke( |
|
typename default_function_impl::expr_param e |
|
, typename default_function_impl::state_param s |
|
, typename default_function_impl::data_param d |
|
, mpl::true_ |
|
, mpl::false_ |
|
) const |
|
{ |
|
BOOST_PROTO_USE_GET_POINTER(); |
|
typedef typename detail::classtypeof<function_type>::type class_type; |
|
return ( |
|
BOOST_PROTO_GET_POINTER(class_type, BOOST_PROTO_DEFAULT_EVAL(~, 1, e)) ->* |
|
BOOST_PROTO_DEFAULT_EVAL(~, 0, e) |
|
)(); |
|
} |
|
|
|
result_type invoke( |
|
typename default_function_impl::expr_param e |
|
, typename default_function_impl::state_param s |
|
, typename default_function_impl::data_param d |
|
, mpl::false_ |
|
, mpl::true_ |
|
) const |
|
{ |
|
BOOST_PROTO_USE_GET_POINTER(); |
|
typedef typename detail::classtypeof<function_type>::type class_type; |
|
return ( |
|
BOOST_PROTO_GET_POINTER(class_type, BOOST_PROTO_DEFAULT_EVAL(~, 1, e)) ->* |
|
BOOST_PROTO_DEFAULT_EVAL(~, 0, e) |
|
); |
|
} |
|
}; |
|
|
|
#include <boost/proto/transform/detail/default_function_impl.hpp> |
|
|
|
#undef BOOST_PROTO_DEFAULT_EVAL_TYPE |
|
#undef BOOST_PROTO_DEFAULT_EVAL |
|
} |
|
|
|
template<typename Grammar /*= detail::_default*/> |
|
struct _default |
|
: switch_<detail::default_cases<Grammar> > |
|
{}; |
|
|
|
template<typename Grammar> |
|
struct is_callable<_default<Grammar> > |
|
: mpl::true_ |
|
{}; |
|
|
|
namespace detail |
|
{ |
|
// Loopy indirection that allows proto::_default<> to be |
|
// used without specifying a Grammar argument. |
|
struct _default |
|
: proto::_default<> |
|
{}; |
|
} |
|
|
|
}} |
|
|
|
#endif |
|
|
|
|