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/proto/detail/prefix.hpp> #include <boost/preprocessor/punctuation/comma.hpp> #include <boost/preprocessor/seq/seq.hpp> #include <boost/mpl/or.hpp> #include <boost/mpl/assert.hpp> #include <boost/type_traits/is_same.hpp> #include <boost/proto/proto_fwd.hpp> #include <boost/proto/tags.hpp> #include <boost/proto/expr.hpp> #include <boost/proto/matches.hpp> #include <boost/proto/generate.hpp> #include <boost/proto/make_expr.hpp> #include <boost/proto/detail/suffix.hpp> namespace boost { namespace proto { namespace detail { template<typename Domain, typename Expr> struct generate_if : lazy_enable_if_c< matches<Expr, typename Domain::proto_grammar>::value , typename Domain::template result<void(Expr)> > {}; // Optimization, generate fewer templates... template<typename Expr> struct generate_if<proto::default_domain, Expr> { typedef Expr type; }; template<typename Domain, typename Tag, typename Left, typename Right> struct generate_if_left : lazy_enable_if_c< matches<proto::expr<Tag, proto::list2<Left &, Right> >, typename Domain::proto_grammar>::value , typename Domain::template result<void( proto::expr<Tag, proto::list2<Left &, typename Domain::template result<void(Right)>::type> > )> > {}; // Optimization, generate fewer templates... template<typename Tag, typename Left, typename Right> struct generate_if_left<proto::default_domain, Tag, Left, Right> { typedef proto::expr<Tag, proto::list2<Left &, Right> > type; }; template<typename Domain, typename Tag, typename Left, typename Right> struct generate_if_right : lazy_enable_if_c< matches<proto::expr<Tag, proto::list2<Left, Right &> >, typename Domain::proto_grammar>::value , typename Domain::template result<void( proto::expr<Tag, proto::list2<typename Domain::template result<void(Left)>::type, Right &> > )> > {}; // Optimization, generate fewer templates... template<typename Tag, typename Left, typename Right> struct generate_if_right<proto::default_domain, Tag, Left, Right> { typedef proto::expr<Tag, proto::list2<Left, Right &> > type; }; template<typename Tag, typename Left, typename Right, typename Enable1 = void, typename Enable2 = void> struct as_expr_if2 {}; template<typename Tag, typename Left, typename Right> struct as_expr_if2<Tag, Left, Right, typename Left::proto_is_expr_, void> : generate_if_left< typename Left::proto_domain , Tag , Left , proto::expr<tag::terminal, term<Right &> > > { typedef proto::expr<tag::terminal, term<Right &> > term_type; typedef proto::expr<Tag, list2<Left &, typename Left::proto_domain::template result<void(term_type)>::type> > expr_type; static typename Left::proto_domain::template result<void(expr_type)>::type make(Left &left, Right &right) { term_type term = {right}; expr_type that = {left, typename Left::proto_domain()(term)}; return typename Left::proto_domain()(that); } }; template<typename Tag, typename Left, typename Right> struct as_expr_if2<Tag, Left, Right, void, typename Right::proto_is_expr_> : generate_if_right< typename Right::proto_domain , Tag , proto::expr<tag::terminal, term<Left &> > , Right > { typedef proto::expr<tag::terminal, term<Left &> > term_type; typedef proto::expr<Tag, list2<typename Right::proto_domain::template result<void(term_type)>::type, Right &> > expr_type; static typename Right::proto_domain::template result<void(expr_type)>::type make(Left &left, Right &right) { term_type term = {left}; expr_type that = {typename Right::proto_domain()(term), right}; return typename Right::proto_domain()(that); } }; template<typename Tag, typename Left, typename Right, typename Enable1 = void, typename Enable2 = void> struct as_expr_if : as_expr_if2<Tag, Left, Right> {}; template<typename Tag, typename Left, typename Right> struct as_expr_if<Tag, Left, Right, typename Left::proto_is_expr_, typename Right::proto_is_expr_> : generate_if< typename Left::proto_domain , proto::expr<Tag, list2<Left &, Right &> > > { typedef proto::expr<Tag, list2<Left &, Right &> > expr_type; BOOST_MPL_ASSERT((is_same<typename Left::proto_domain, typename Right::proto_domain>)); static typename Left::proto_domain::template result<void(expr_type)>::type make(Left &left, Right &right) { expr_type that = {left, right}; return typename Left::proto_domain()(that); } }; template<typename Arg, typename Trait, typename Enable = void> struct arg_weight { BOOST_STATIC_CONSTANT(int, value = 1 + Trait::value); }; template<typename Arg, typename Trait> struct arg_weight<Arg, Trait, typename Arg::proto_is_expr_> { BOOST_STATIC_CONSTANT(int, value = 0); }; template<typename Domain, typename Trait, typename Arg, typename Expr> struct enable_unary : boost::enable_if< boost::mpl::and_<Trait, boost::proto::matches<Expr, typename Domain::proto_grammar> > , Expr > {}; template<typename Trait, typename Arg, typename Expr> struct enable_unary<deduce_domain, Trait, Arg, Expr> : boost::enable_if< boost::mpl::and_< Trait , boost::proto::matches<Expr, typename domain_of<Arg>::type::proto_grammar> > , Expr > {}; template<typename Trait, typename Arg, typename Expr> struct enable_unary<default_domain, Trait, Arg, Expr> : boost::enable_if<Trait, Expr> {}; template<typename Domain, typename Trait1, typename Arg1, typename Trait2, typename Arg2, typename Expr> struct enable_binary : boost::enable_if< boost::mpl::and_< mpl::bool_<(3 <= (arg_weight<Arg1, Trait1>::value + arg_weight<Arg2, Trait2>::value))> , boost::proto::matches<Expr, typename Domain::proto_grammar> > , Expr > {}; template<typename Trait1, typename Arg1, typename Trait2, typename Arg2, typename Expr> struct enable_binary<deduce_domain, Trait1, Arg1, Trait2, Arg2, Expr> : boost::enable_if< boost::mpl::and_< mpl::bool_<(3 <= (arg_weight<Arg1, Trait1>::value + arg_weight<Arg2, Trait2>::value))> , boost::proto::matches<Expr, typename deduce_domain2<Arg1, Arg2>::type::proto_grammar> > , Expr > {}; template<typename Trait1, typename Arg1, typename Trait2, typename Arg2, typename Expr> struct enable_binary<default_domain, Trait1, Arg1, Trait2, Arg2, Expr> : boost::enable_if_c< (3 <= (arg_weight<Arg1, Trait1>::value + arg_weight<Arg2, Trait2>::value)) , Expr > {}; } // detail #define BOOST_PROTO_UNARY_OP_IS_POSTFIX_0 #define BOOST_PROTO_UNARY_OP_IS_POSTFIX_1 , int #define BOOST_PROTO_DEFINE_UNARY_OPERATOR(OP, TAG, POST) \ template<typename Arg> \ typename detail::generate_if< \ typename Arg::proto_domain \ , proto::expr<TAG, list1<typename Arg::proto_derived_expr &> > \ >::type const \ operator OP(Arg &arg BOOST_PROTO_UNARY_OP_IS_POSTFIX_ ## POST) \ { \ typedef proto::expr<TAG, list1<typename Arg::proto_derived_expr &> > that_type; \ that_type that = {arg}; \ return typename Arg::proto_domain()(that); \ } \ template<typename Arg> \ typename detail::generate_if< \ typename Arg::proto_domain \ , proto::expr<TAG, list1<typename Arg::proto_derived_expr const &> > \ >::type const \ operator OP(Arg const &arg BOOST_PROTO_UNARY_OP_IS_POSTFIX_ ## POST) \ { \ typedef proto::expr<TAG, list1<typename Arg::proto_derived_expr const &> > that_type; \ that_type that = {arg}; \ return typename Arg::proto_domain()(that); \ } \ /**/ #define BOOST_PROTO_DEFINE_BINARY_OPERATOR(OP, TAG) \ template<typename Left, typename Right> \ inline typename detail::as_expr_if<TAG, Left, Right>::type const \ operator OP(Left &left, Right &right) \ { \ return detail::as_expr_if<TAG, Left, Right>::make(left, right); \ } \ template<typename Left, typename Right> \ inline typename detail::as_expr_if<TAG, Left, Right const>::type const \ operator OP(Left &left, Right const &right) \ { \ return detail::as_expr_if<TAG, Left, Right const>::make(left, right); \ } \ template<typename Left, typename Right> \ inline typename detail::as_expr_if<TAG, Left const, Right>::type const \ operator OP(Left const &left, Right &right) \ { \ return detail::as_expr_if<TAG, Left const, Right>::make(left, right); \ } \ template<typename Left, typename Right> \ inline typename detail::as_expr_if<TAG, Left const, Right const>::type const \ operator OP(Left const &left, Right const &right) \ { \ return detail::as_expr_if<TAG, Left const, Right const>::make(left, right); \ } \ /**/ BOOST_PROTO_BEGIN_ADL_NAMESPACE(exprns_) BOOST_PROTO_DEFINE_UNARY_OPERATOR(+, tag::unary_plus, 0) BOOST_PROTO_DEFINE_UNARY_OPERATOR(-, tag::negate, 0) BOOST_PROTO_DEFINE_UNARY_OPERATOR(*, tag::dereference, 0) BOOST_PROTO_DEFINE_UNARY_OPERATOR(~, tag::complement, 0) BOOST_PROTO_DEFINE_UNARY_OPERATOR(&, tag::address_of, 0) BOOST_PROTO_DEFINE_UNARY_OPERATOR(!, tag::logical_not, 0) BOOST_PROTO_DEFINE_UNARY_OPERATOR(++, tag::pre_inc, 0) BOOST_PROTO_DEFINE_UNARY_OPERATOR(--, tag::pre_dec, 0) BOOST_PROTO_DEFINE_UNARY_OPERATOR(++, tag::post_inc, 1) BOOST_PROTO_DEFINE_UNARY_OPERATOR(--, tag::post_dec, 1) BOOST_PROTO_DEFINE_BINARY_OPERATOR(<<, tag::shift_left) BOOST_PROTO_DEFINE_BINARY_OPERATOR(>>, tag::shift_right) BOOST_PROTO_DEFINE_BINARY_OPERATOR(*, tag::multiplies) BOOST_PROTO_DEFINE_BINARY_OPERATOR(/, tag::divides) BOOST_PROTO_DEFINE_BINARY_OPERATOR(%, tag::modulus) BOOST_PROTO_DEFINE_BINARY_OPERATOR(+, tag::plus) BOOST_PROTO_DEFINE_BINARY_OPERATOR(-, tag::minus) BOOST_PROTO_DEFINE_BINARY_OPERATOR(<, tag::less) BOOST_PROTO_DEFINE_BINARY_OPERATOR(>, tag::greater) BOOST_PROTO_DEFINE_BINARY_OPERATOR(<=, tag::less_equal) BOOST_PROTO_DEFINE_BINARY_OPERATOR(>=, tag::greater_equal) BOOST_PROTO_DEFINE_BINARY_OPERATOR(==, tag::equal_to) BOOST_PROTO_DEFINE_BINARY_OPERATOR(!=, tag::not_equal_to) BOOST_PROTO_DEFINE_BINARY_OPERATOR(||, tag::logical_or) BOOST_PROTO_DEFINE_BINARY_OPERATOR(&&, tag::logical_and) BOOST_PROTO_DEFINE_BINARY_OPERATOR(&, tag::bitwise_and) BOOST_PROTO_DEFINE_BINARY_OPERATOR(|, tag::bitwise_or) BOOST_PROTO_DEFINE_BINARY_OPERATOR(^, tag::bitwise_xor) BOOST_PROTO_DEFINE_BINARY_OPERATOR(BOOST_PP_COMMA(), tag::comma) BOOST_PROTO_DEFINE_BINARY_OPERATOR(->*, tag::mem_ptr) BOOST_PROTO_DEFINE_BINARY_OPERATOR(<<=, tag::shift_left_assign) BOOST_PROTO_DEFINE_BINARY_OPERATOR(>>=, tag::shift_right_assign) BOOST_PROTO_DEFINE_BINARY_OPERATOR(*=, tag::multiplies_assign) BOOST_PROTO_DEFINE_BINARY_OPERATOR(/=, tag::divides_assign) BOOST_PROTO_DEFINE_BINARY_OPERATOR(%=, tag::modulus_assign) BOOST_PROTO_DEFINE_BINARY_OPERATOR(+=, tag::plus_assign) BOOST_PROTO_DEFINE_BINARY_OPERATOR(-=, tag::minus_assign) BOOST_PROTO_DEFINE_BINARY_OPERATOR(&=, tag::bitwise_and_assign) BOOST_PROTO_DEFINE_BINARY_OPERATOR(|=, tag::bitwise_or_assign) BOOST_PROTO_DEFINE_BINARY_OPERATOR(^=, tag::bitwise_xor_assign) /// if_else /// BOOST_PROTO_DEFINE_FUNCTION_TEMPLATE( 3 , if_else , deduce_domain , (tag::if_else_) , BOOST_PP_SEQ_NIL ) BOOST_PROTO_END_ADL_NAMESPACE(exprns_) BOOST_PROTO_WHEN_NOT_BUILDING_DOCS(using exprns_::if_else;) #undef BOOST_PROTO_DEFINE_UNARY_OPERATOR #undef BOOST_PROTO_DEFINE_BINARY_OPERATOR #define BOOST_PROTO_DEFINE_UNARY_OPERATOR(OP, TAG, TRAIT, DOMAIN, POST) \ template<typename Arg> \ typename boost::proto::detail::enable_unary<DOMAIN, TRAIT<Arg>, Arg \ , typename boost::proto::result_of::make_expr<TAG, DOMAIN, Arg &>::type \ >::type const \ operator OP(Arg &arg BOOST_PROTO_UNARY_OP_IS_POSTFIX_ ## POST) \ { \ return boost::proto::make_expr<TAG, DOMAIN>(boost::ref(arg)); \ } \ template<typename Arg> \ typename boost::proto::detail::enable_unary<DOMAIN, TRAIT<Arg>, Arg \ , typename boost::proto::result_of::make_expr<TAG, DOMAIN, Arg const &>::type \ >::type const \ operator OP(Arg const &arg BOOST_PROTO_UNARY_OP_IS_POSTFIX_ ## POST) \ { \ return boost::proto::make_expr<TAG, DOMAIN>(boost::ref(arg)); \ } \ /**/ #define BOOST_PROTO_DEFINE_BINARY_OPERATOR(OP, TAG, TRAIT, DOMAIN) \ template<typename Left, typename Right> \ typename boost::proto::detail::enable_binary<DOMAIN, TRAIT<Left>, Left, TRAIT<Right>, Right \ , typename boost::proto::result_of::make_expr<TAG, DOMAIN, Left &, Right &>::type \ >::type const \ operator OP(Left &left, Right &right) \ { \ return boost::proto::make_expr<TAG, DOMAIN>(boost::ref(left), boost::ref(right)); \ } \ template<typename Left, typename Right> \ typename boost::proto::detail::enable_binary<DOMAIN, TRAIT<Left>, Left, TRAIT<Right>, Right \ , typename boost::proto::result_of::make_expr<TAG, DOMAIN, Left &, Right const &>::type \ >::type const \ operator OP(Left &left, Right const &right) \ { \ return boost::proto::make_expr<TAG, DOMAIN>(boost::ref(left), boost::ref(right)); \ } \ template<typename Left, typename Right> \ typename boost::proto::detail::enable_binary<DOMAIN, TRAIT<Left>, Left, TRAIT<Right>, Right \ , typename boost::proto::result_of::make_expr<TAG, DOMAIN, Left const &, Right &>::type \ >::type const \ operator OP(Left const &left, Right &right) \ { \ return boost::proto::make_expr<TAG, DOMAIN>(boost::ref(left), boost::ref(right)); \ } \ template<typename Left, typename Right> \ typename boost::proto::detail::enable_binary<DOMAIN, TRAIT<Left>, Left, TRAIT<Right>, Right \ , typename boost::proto::result_of::make_expr<TAG, DOMAIN, Left const &, Right const &>::type\ >::type const \ operator OP(Left const &left, Right const &right) \ { \ return boost::proto::make_expr<TAG, DOMAIN>(boost::ref(left), boost::ref(right)); \ } \ /**/ #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) \ /**/ template<typename T> struct is_extension : mpl::false_ {}; #ifndef BOOST_PROTO_BUILDING_DOCS namespace exops { BOOST_PROTO_DEFINE_OPERATORS(is_extension, default_domain) using proto::if_else; } #endif }} #endif