boost/proto/operators.hpp
/////////////////////////////////////////////////////////////////////////////// /// \file operators.hpp /// Contains all the overloaded operators that make it possible to build /// Proto expression trees. // // Copyright 2008 Eric Niebler. Distributed under the Boost // Software License, Version 1.0. (See accompanying file // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) #ifndef BOOST_PROTO_OPERATORS_HPP_EAN_04_01_2005 #define BOOST_PROTO_OPERATORS_HPP_EAN_04_01_2005 #include <boost/config.hpp> #include <boost/preprocessor/punctuation/comma.hpp> #include <boost/mpl/logical.hpp> #include <boost/utility/enable_if.hpp> #include <boost/proto/proto_fwd.hpp> #include <boost/proto/tags.hpp> #include <boost/proto/domain.hpp> #include <boost/proto/matches.hpp> #include <boost/proto/generate.hpp> #include <boost/proto/make_expr.hpp> namespace boost { namespace proto { namespace detail { template<typename MakeExpr, typename Grammar> struct lazy_matches : proto::matches<typename MakeExpr::type, Grammar> {}; template<typename Domain, typename Grammar, typename Trait, typename Tag, typename Arg> struct enable_unary : boost::lazy_enable_if_c< boost::mpl::and_< Trait , lazy_matches<result_of::make_expr<Tag, basic_default_domain, Arg>, Grammar> >::value , result_of::make_expr<Tag, Domain, Arg> > {}; template<typename Domain, typename Trait, typename Tag, typename Arg> struct enable_unary<Domain, proto::_, Trait, Tag, Arg &> : boost::lazy_enable_if_c< Trait::value , result_of::make_expr<Tag, Domain, Arg &> > {}; template<typename Trait, typename Tag, typename Arg> struct enable_unary<deduce_domain, not_a_grammar, Trait, Tag, Arg &> : enable_unary< typename domain_of<Arg>::type , typename domain_of<Arg>::type::proto_grammar , Trait , Tag , Arg & > {}; template<typename Domain, typename Grammar, typename Trait, typename Tag, typename Left, typename Right> struct enable_binary : boost::lazy_enable_if_c< boost::mpl::and_< Trait , lazy_matches<result_of::make_expr<Tag, basic_default_domain, Left, Right>, Grammar> >::value , result_of::make_expr<Tag, Domain, Left, Right> > {}; template<typename Domain, typename Trait, typename Tag, typename Left, typename Right> struct enable_binary<Domain, proto::_, Trait, Tag, Left &, Right &> : boost::lazy_enable_if_c< Trait::value , result_of::make_expr<Tag, Domain, Left &, Right &> > {}; template<typename Trait, typename Tag, typename Left, typename Right> struct enable_binary<deduce_domain, not_a_grammar, Trait, Tag, Left &, Right &> : enable_binary< typename deduce_domain2<Left, Right>::type , typename deduce_domain2<Left, Right>::type::proto_grammar , Trait , Tag , Left & , Right & > {}; } // detail #define BOOST_PROTO_UNARY_OP_IS_POSTFIX_0 #define BOOST_PROTO_UNARY_OP_IS_POSTFIX_1 , int #ifdef BOOST_NO_RVALUE_REFERENCES #define BOOST_PROTO_DEFINE_UNARY_OPERATOR(OP, TAG, TRAIT, DOMAIN, POST) \ template<typename Arg> \ typename boost::proto::detail::enable_unary< \ DOMAIN \ , DOMAIN::proto_grammar \ , BOOST_PROTO_APPLY_UNARY_(TRAIT, Arg) \ , TAG \ , Arg & \ >::type const \ operator OP(Arg &arg BOOST_PROTO_UNARY_OP_IS_POSTFIX_ ## POST) \ { \ return boost::proto::detail::make_expr_<TAG, DOMAIN, Arg &>()(arg); \ } \ \ template<typename Arg> \ typename boost::proto::detail::enable_unary< \ DOMAIN \ , DOMAIN::proto_grammar \ , BOOST_PROTO_APPLY_UNARY_(TRAIT, Arg) \ , TAG \ , Arg const & \ >::type const \ operator OP(Arg const &arg BOOST_PROTO_UNARY_OP_IS_POSTFIX_ ## POST) \ { \ return boost::proto::detail::make_expr_<TAG, DOMAIN, Arg const &>()(arg); \ } \ /**/ #define BOOST_PROTO_DEFINE_BINARY_OPERATOR(OP, TAG, TRAIT, DOMAIN) \ template<typename Left, typename Right> \ typename boost::proto::detail::enable_binary< \ DOMAIN \ , DOMAIN::proto_grammar \ , BOOST_PROTO_APPLY_BINARY_(TRAIT, Left, Right) \ , TAG \ , Left & \ , Right & \ >::type const \ operator OP(Left &left, Right &right) \ { \ return boost::proto::detail::make_expr_<TAG, DOMAIN, Left &, Right &>()(left, right); \ } \ \ template<typename Left, typename Right> \ typename boost::proto::detail::enable_binary< \ DOMAIN \ , DOMAIN::proto_grammar \ , BOOST_PROTO_APPLY_BINARY_(TRAIT, Left, Right) \ , TAG \ , Left & \ , Right const & \ >::type const \ operator OP(Left &left, Right const &right) \ { \ return boost::proto::detail::make_expr_<TAG, DOMAIN, Left &, Right const &>()(left, right); \ } \ \ template<typename Left, typename Right> \ typename boost::proto::detail::enable_binary< \ DOMAIN \ , DOMAIN::proto_grammar \ , BOOST_PROTO_APPLY_BINARY_(TRAIT, Left, Right) \ , TAG \ , Left const & \ , Right & \ >::type const \ operator OP(Left const &left, Right &right) \ { \ return boost::proto::detail::make_expr_<TAG, DOMAIN, Left const &, Right &>()(left, right); \ } \ \ template<typename Left, typename Right> \ typename boost::proto::detail::enable_binary< \ DOMAIN \ , DOMAIN::proto_grammar \ , BOOST_PROTO_APPLY_BINARY_(TRAIT, Left, Right) \ , TAG \ , Left const & \ , Right const & \ >::type const \ operator OP(Left const &left, Right const &right) \ { \ return boost::proto::detail::make_expr_<TAG, DOMAIN, Left const &, Right const &>()(left, right);\ } \ /**/ #else #define BOOST_PROTO_DEFINE_UNARY_OPERATOR(OP, TAG, TRAIT, DOMAIN, POST) \ template<typename Arg> \ typename boost::proto::detail::enable_unary< \ DOMAIN \ , DOMAIN::proto_grammar \ , BOOST_PROTO_APPLY_UNARY_(TRAIT, Arg) \ , TAG \ , Arg const & \ >::type const \ operator OP(Arg &&arg BOOST_PROTO_UNARY_OP_IS_POSTFIX_ ## POST) \ { \ return boost::proto::detail::make_expr_<TAG, DOMAIN, Arg const &>()(arg); \ } \ /**/ #define BOOST_PROTO_DEFINE_BINARY_OPERATOR(OP, TAG, TRAIT, DOMAIN) \ template<typename Left, typename Right> \ typename boost::proto::detail::enable_binary< \ DOMAIN \ , DOMAIN::proto_grammar \ , BOOST_PROTO_APPLY_BINARY_(TRAIT, Left, Right) \ , TAG \ , Left const & \ , Right const & \ >::type const \ operator OP(Left &&left, Right &&right) \ { \ return boost::proto::detail::make_expr_<TAG, DOMAIN, Left const &, Right const &>()(left, right);\ } \ /**/ #endif #define BOOST_PROTO_DEFINE_OPERATORS(TRAIT, DOMAIN) \ BOOST_PROTO_DEFINE_UNARY_OPERATOR(+, boost::proto::tag::unary_plus, TRAIT, DOMAIN, 0) \ BOOST_PROTO_DEFINE_UNARY_OPERATOR(-, boost::proto::tag::negate, TRAIT, DOMAIN, 0) \ BOOST_PROTO_DEFINE_UNARY_OPERATOR(*, boost::proto::tag::dereference, TRAIT, DOMAIN, 0) \ BOOST_PROTO_DEFINE_UNARY_OPERATOR(~, boost::proto::tag::complement, TRAIT, DOMAIN, 0) \ BOOST_PROTO_DEFINE_UNARY_OPERATOR(&, boost::proto::tag::address_of, TRAIT, DOMAIN, 0) \ BOOST_PROTO_DEFINE_UNARY_OPERATOR(!, boost::proto::tag::logical_not, TRAIT, DOMAIN, 0) \ BOOST_PROTO_DEFINE_UNARY_OPERATOR(++, boost::proto::tag::pre_inc, TRAIT, DOMAIN, 0) \ BOOST_PROTO_DEFINE_UNARY_OPERATOR(--, boost::proto::tag::pre_dec, TRAIT, DOMAIN, 0) \ BOOST_PROTO_DEFINE_UNARY_OPERATOR(++, boost::proto::tag::post_inc, TRAIT, DOMAIN, 1) \ BOOST_PROTO_DEFINE_UNARY_OPERATOR(--, boost::proto::tag::post_dec, TRAIT, DOMAIN, 1) \ BOOST_PROTO_DEFINE_BINARY_OPERATOR(<<, boost::proto::tag::shift_left, TRAIT, DOMAIN) \ BOOST_PROTO_DEFINE_BINARY_OPERATOR(>>, boost::proto::tag::shift_right, TRAIT, DOMAIN) \ BOOST_PROTO_DEFINE_BINARY_OPERATOR(*, boost::proto::tag::multiplies, TRAIT, DOMAIN) \ BOOST_PROTO_DEFINE_BINARY_OPERATOR(/, boost::proto::tag::divides, TRAIT, DOMAIN) \ BOOST_PROTO_DEFINE_BINARY_OPERATOR(%, boost::proto::tag::modulus, TRAIT, DOMAIN) \ BOOST_PROTO_DEFINE_BINARY_OPERATOR(+, boost::proto::tag::plus, TRAIT, DOMAIN) \ BOOST_PROTO_DEFINE_BINARY_OPERATOR(-, boost::proto::tag::minus, TRAIT, DOMAIN) \ BOOST_PROTO_DEFINE_BINARY_OPERATOR(<, boost::proto::tag::less, TRAIT, DOMAIN) \ BOOST_PROTO_DEFINE_BINARY_OPERATOR(>, boost::proto::tag::greater, TRAIT, DOMAIN) \ BOOST_PROTO_DEFINE_BINARY_OPERATOR(<=, boost::proto::tag::less_equal, TRAIT, DOMAIN) \ BOOST_PROTO_DEFINE_BINARY_OPERATOR(>=, boost::proto::tag::greater_equal, TRAIT, DOMAIN) \ BOOST_PROTO_DEFINE_BINARY_OPERATOR(==, boost::proto::tag::equal_to, TRAIT, DOMAIN) \ BOOST_PROTO_DEFINE_BINARY_OPERATOR(!=, boost::proto::tag::not_equal_to, TRAIT, DOMAIN) \ BOOST_PROTO_DEFINE_BINARY_OPERATOR(||, boost::proto::tag::logical_or, TRAIT, DOMAIN) \ BOOST_PROTO_DEFINE_BINARY_OPERATOR(&&, boost::proto::tag::logical_and, TRAIT, DOMAIN) \ BOOST_PROTO_DEFINE_BINARY_OPERATOR(&, boost::proto::tag::bitwise_and, TRAIT, DOMAIN) \ BOOST_PROTO_DEFINE_BINARY_OPERATOR(|, boost::proto::tag::bitwise_or, TRAIT, DOMAIN) \ BOOST_PROTO_DEFINE_BINARY_OPERATOR(^, boost::proto::tag::bitwise_xor, TRAIT, DOMAIN) \ BOOST_PROTO_DEFINE_BINARY_OPERATOR(BOOST_PP_COMMA(), boost::proto::tag::comma, TRAIT, DOMAIN) \ BOOST_PROTO_DEFINE_BINARY_OPERATOR(->*, boost::proto::tag::mem_ptr, TRAIT, DOMAIN) \ BOOST_PROTO_DEFINE_BINARY_OPERATOR(<<=, boost::proto::tag::shift_left_assign, TRAIT, DOMAIN) \ BOOST_PROTO_DEFINE_BINARY_OPERATOR(>>=, boost::proto::tag::shift_right_assign, TRAIT, DOMAIN) \ BOOST_PROTO_DEFINE_BINARY_OPERATOR(*=, boost::proto::tag::multiplies_assign, TRAIT, DOMAIN) \ BOOST_PROTO_DEFINE_BINARY_OPERATOR(/=, boost::proto::tag::divides_assign, TRAIT, DOMAIN) \ BOOST_PROTO_DEFINE_BINARY_OPERATOR(%=, boost::proto::tag::modulus_assign, TRAIT, DOMAIN) \ BOOST_PROTO_DEFINE_BINARY_OPERATOR(+=, boost::proto::tag::plus_assign, TRAIT, DOMAIN) \ BOOST_PROTO_DEFINE_BINARY_OPERATOR(-=, boost::proto::tag::minus_assign, TRAIT, DOMAIN) \ BOOST_PROTO_DEFINE_BINARY_OPERATOR(&=, boost::proto::tag::bitwise_and_assign, TRAIT, DOMAIN) \ BOOST_PROTO_DEFINE_BINARY_OPERATOR(|=, boost::proto::tag::bitwise_or_assign, TRAIT, DOMAIN) \ BOOST_PROTO_DEFINE_BINARY_OPERATOR(^=, boost::proto::tag::bitwise_xor_assign, TRAIT, DOMAIN) \ /**/ // Extensions are a superset of Proto expressions template<typename T> struct is_extension : is_expr<T> {}; template<typename T> struct is_extension<T &> : is_expr<T> {}; #define BOOST_PROTO_APPLY_UNARY_(TRAIT, ARG) TRAIT<ARG> #define BOOST_PROTO_APPLY_BINARY_(TRAIT, LEFT, RIGHT) boost::mpl::or_<TRAIT<LEFT>, TRAIT<RIGHT> > namespace exprns_ { // This defines all of Proto's built-in free operator overloads BOOST_PROTO_DEFINE_OPERATORS(is_extension, deduce_domain) // if_else, for the non-overloadable ternary conditional operator ?: template<typename A0, typename A1, typename A2> typename result_of::make_expr< tag::if_else_ , deduce_domain , A0 const & , A1 const & , A2 const & >::type const if_else(A0 const &a0, A1 const &a1, A2 const &a2) { return proto::detail::make_expr_< tag::if_else_ , deduce_domain , A0 const & , A1 const & , A2 const & >()(a0, a1, a2); } } using exprns_::if_else; #undef BOOST_PROTO_APPLY_UNARY_ #undef BOOST_PROTO_APPLY_BINARY_ // Redefine BOOST_PROTO_APPLY_UNARY_ and BOOST_PROTO_APPLY_BINARY_ so that end users // can use BOOST_PROTO_DEFINE_OPERATORS to define Proto operator overloads that work // with their own terminal types. #ifdef BOOST_NO_RVALUE_REFERENCES #define BOOST_PROTO_APPLY_UNARY_(TRAIT, ARG) \ boost::mpl::and_< \ TRAIT<ARG> \ , boost::mpl::not_<boost::proto::is_extension<ARG> > \ > \ /**/ #define BOOST_PROTO_APPLY_BINARY_(TRAIT, LEFT, RIGHT) \ boost::mpl::and_< \ boost::mpl::or_<TRAIT<LEFT>, TRAIT<RIGHT> > \ , boost::mpl::not_< \ boost::mpl::or_< \ boost::proto::is_extension<LEFT> \ , boost::proto::is_extension<RIGHT> \ > \ > \ > \ /**/ #else #define BOOST_PROTO_APPLY_UNARY_(TRAIT, ARG) \ boost::mpl::and_< \ TRAIT<BOOST_PROTO_UNCVREF(ARG) > \ , boost::mpl::not_<boost::proto::is_extension<ARG> > \ > \ /**/ #define BOOST_PROTO_APPLY_BINARY_(TRAIT, LEFT, RIGHT) \ boost::mpl::and_< \ boost::mpl::or_<TRAIT<BOOST_PROTO_UNCVREF(LEFT) >, TRAIT<BOOST_PROTO_UNCVREF(RIGHT) > > \ , boost::mpl::not_< \ boost::mpl::or_< \ boost::proto::is_extension<LEFT> \ , boost::proto::is_extension<RIGHT> \ > \ > \ > \ /**/ #endif }} #endif