510 lines
19 KiB
C++
510 lines
19 KiB
C++
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///////////////////////////////////////////////////////////////////////////////
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/// \file make_expr.hpp
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/// Definition of the \c make_expr() and \c unpack_expr() utilities for
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/// building Proto expression nodes from child nodes or from a Fusion
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/// sequence of child nodes, respectively.
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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_MAKE_EXPR_HPP_EAN_04_01_2005
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#define BOOST_PROTO_MAKE_EXPR_HPP_EAN_04_01_2005
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#include <boost/preprocessor/cat.hpp>
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#include <boost/preprocessor/arithmetic/inc.hpp>
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#include <boost/preprocessor/arithmetic/dec.hpp>
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#include <boost/preprocessor/arithmetic/sub.hpp>
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#include <boost/preprocessor/punctuation/comma_if.hpp>
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#include <boost/preprocessor/iteration/iterate.hpp>
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#include <boost/preprocessor/facilities/intercept.hpp>
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#include <boost/preprocessor/repetition/enum.hpp>
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#include <boost/preprocessor/repetition/enum_params.hpp>
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#include <boost/preprocessor/repetition/enum_binary_params.hpp>
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#include <boost/preprocessor/repetition/enum_shifted_params.hpp>
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#include <boost/preprocessor/repetition/enum_trailing_params.hpp>
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#include <boost/preprocessor/repetition/enum_trailing_binary_params.hpp>
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#include <boost/preprocessor/repetition/repeat.hpp>
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#include <boost/ref.hpp>
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#include <boost/mpl/if.hpp>
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#include <boost/mpl/assert.hpp>
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#include <boost/mpl/eval_if.hpp>
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#include <boost/utility/enable_if.hpp>
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#include <boost/type_traits/add_const.hpp>
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#include <boost/type_traits/add_reference.hpp>
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#include <boost/type_traits/remove_cv.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/domain.hpp>
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#include <boost/proto/generate.hpp>
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#include <boost/fusion/include/at_c.hpp>
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#include <boost/fusion/include/begin.hpp>
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#include <boost/fusion/include/next.hpp>
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#include <boost/fusion/include/value_of.hpp>
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#include <boost/fusion/include/size.hpp>
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#include <boost/proto/detail/poly_function.hpp>
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#include <boost/proto/detail/deprecated.hpp>
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#if defined(_MSC_VER)
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# pragma warning(push)
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# pragma warning(disable : 4180) // qualifier applied to function type has no meaning; ignored
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# pragma warning(disable : 4714) // function 'xxx' marked as __forceinline not inlined
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#endif
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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 BOOST_PROTO_AS_CHILD_TYPE(Z, N, DATA) \
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typename boost::proto::detail::protoify< \
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BOOST_PP_CAT(BOOST_PP_TUPLE_ELEM(3, 0, DATA), N) \
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, BOOST_PP_TUPLE_ELEM(3, 2, DATA) \
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>::result_type \
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/**/
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/// INTERNAL ONLY
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///
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#define BOOST_PROTO_AS_CHILD(Z, N, DATA) \
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boost::proto::detail::protoify< \
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BOOST_PP_CAT(BOOST_PP_TUPLE_ELEM(3, 0, DATA), N) \
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, BOOST_PP_TUPLE_ELEM(3, 2, DATA) \
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>()(BOOST_PP_CAT(BOOST_PP_TUPLE_ELEM(3, 1, DATA), N)) \
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/**/
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namespace detail
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{
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template<typename T, typename Domain>
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struct protoify
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: Domain::template as_expr<T>
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{};
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template<typename T, typename Domain>
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struct protoify<T &, Domain>
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: Domain::template as_child<T>
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{};
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template<typename T, typename Domain>
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struct protoify<boost::reference_wrapper<T>, Domain>
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: Domain::template as_child<T>
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{};
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template<typename T, typename Domain>
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struct protoify<boost::reference_wrapper<T> const, Domain>
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: Domain::template as_child<T>
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{};
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// Definition of detail::unpack_expr_
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#include <boost/proto/detail/unpack_expr_.hpp>
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// Definition of detail::make_expr_
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#include <boost/proto/detail/make_expr_.hpp>
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}
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namespace result_of
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{
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/// \brief Metafunction that computes the return type of the
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/// \c make_expr() function, with a domain deduced from the
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/// domains of the children.
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///
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/// Use the <tt>result_of::make_expr\<\></tt> metafunction to
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/// compute the return type of the \c make_expr() function.
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///
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/// In this specialization, the domain is deduced from the
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/// domains of the child types. (If
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/// <tt>is_domain\<A0\>::value</tt> is \c true, then another
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/// specialization is selected.)
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template<
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typename Tag
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, BOOST_PP_ENUM_PARAMS(BOOST_PROTO_MAX_ARITY, typename A)
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, typename Void1 // = void
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, typename Void2 // = void
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>
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struct make_expr
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{
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/// Same as <tt>result_of::make_expr\<Tag, D, A0, ... AN\>::type</tt>
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/// where \c D is the deduced domain, which is calculated as follows:
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///
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/// For each \c x in <tt>[0,N)</tt> (proceeding in order beginning with
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/// <tt>x=0</tt>), if <tt>domain_of\<Ax\>::type</tt> is not
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/// \c default_domain, then \c D is <tt>domain_of\<Ax\>::type</tt>.
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/// Otherwise, \c D is \c default_domain.
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typedef
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typename detail::make_expr_<
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Tag
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, deduce_domain
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BOOST_PP_ENUM_TRAILING_PARAMS(BOOST_PROTO_MAX_ARITY, A)
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>::result_type
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type;
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};
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/// \brief Metafunction that computes the return type of the
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/// \c make_expr() function, within the specified domain.
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///
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/// Use the <tt>result_of::make_expr\<\></tt> metafunction to compute
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/// the return type of the \c make_expr() function.
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template<
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typename Tag
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, typename Domain
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BOOST_PP_ENUM_TRAILING_PARAMS(BOOST_PROTO_MAX_ARITY, typename A)
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>
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struct make_expr<
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Tag
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, Domain
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BOOST_PP_ENUM_TRAILING_PARAMS(BOOST_PROTO_MAX_ARITY, A)
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, typename Domain::proto_is_domain_
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>
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{
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/// If \c Tag is <tt>tag::terminal</tt>, then \c type is a
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/// typedef for <tt>boost::result_of\<Domain(expr\<tag::terminal,
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/// term\<A0\> \>)\>::type</tt>.
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///
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/// Otherwise, \c type is a typedef for <tt>boost::result_of\<Domain(expr\<Tag,
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/// listN\< as_child\<A0\>::type, ... as_child\<AN\>::type\>)
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/// \>::type</tt>, where \c N is the number of non-void template
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/// arguments, and <tt>as_child\<A\>::type</tt> is evaluated as
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/// follows:
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///
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/// \li If <tt>is_expr\<A\>::value</tt> is \c true, then the
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/// child type is \c A.
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/// \li If \c A is <tt>B &</tt> or <tt>cv boost::reference_wrapper\<B\></tt>,
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/// and <tt>is_expr\<B\>::value</tt> is \c true, then the
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/// child type is <tt>B &</tt>.
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/// \li If <tt>is_expr\<A\>::value</tt> is \c false, then the
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/// child type is <tt>boost::result_of\<Domain(expr\<tag::terminal, term\<A\> \>
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/// )\>::type</tt>.
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/// \li If \c A is <tt>B &</tt> or <tt>cv boost::reference_wrapper\<B\></tt>,
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/// and <tt>is_expr\<B\>::value</tt> is \c false, then the
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/// child type is <tt>boost::result_of\<Domain(expr\<tag::terminal, term\<B &\> \>
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/// )\>::type</tt>.
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typedef
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typename detail::make_expr_<
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Tag
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, Domain
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BOOST_PP_ENUM_TRAILING_PARAMS(BOOST_PROTO_MAX_ARITY, A)
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>::result_type
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type;
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};
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/// \brief Metafunction that computes the return type of the
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/// \c unpack_expr() function, with a domain deduced from the
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/// domains of the children.
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///
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/// Use the <tt>result_of::unpack_expr\<\></tt> metafunction to
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/// compute the return type of the \c unpack_expr() function.
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///
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/// \c Sequence is a Fusion Forward Sequence.
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///
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/// In this specialization, the domain is deduced from the
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/// domains of the child types. (If
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/// <tt>is_domain\<Sequence>::value</tt> is \c true, then another
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/// specialization is selected.)
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template<
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typename Tag
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, typename Sequence
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, typename Void1 // = void
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, typename Void2 // = void
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>
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struct unpack_expr
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{
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/// Let \c S be the type of a Fusion Random Access Sequence
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/// equivalent to \c Sequence. Then \c type is the
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/// same as <tt>result_of::make_expr\<Tag,
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/// fusion::result_of::value_at_c\<S, 0\>::type, ...
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/// fusion::result_of::value_at_c\<S, N-1\>::type\>::type</tt>,
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/// where \c N is the size of \c S.
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typedef
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typename detail::unpack_expr_<
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Tag
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, deduce_domain
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, Sequence
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, fusion::result_of::size<Sequence>::type::value
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>::type
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type;
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};
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/// \brief Metafunction that computes the return type of the
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/// \c unpack_expr() function, within the specified domain.
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///
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/// Use the <tt>result_of::make_expr\<\></tt> metafunction to compute
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/// the return type of the \c make_expr() function.
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template<typename Tag, typename Domain, typename Sequence>
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struct unpack_expr<Tag, Domain, Sequence, typename Domain::proto_is_domain_>
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{
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/// Let \c S be the type of a Fusion Random Access Sequence
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/// equivalent to \c Sequence. Then \c type is the
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/// same as <tt>result_of::make_expr\<Tag, Domain,
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/// fusion::result_of::value_at_c\<S, 0\>::type, ...
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/// fusion::result_of::value_at_c\<S, N-1\>::type\>::type</tt>,
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/// where \c N is the size of \c S.
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typedef
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typename detail::unpack_expr_<
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Tag
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, Domain
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, Sequence
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, fusion::result_of::size<Sequence>::type::value
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>::type
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type;
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};
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}
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namespace functional
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{
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/// \brief A callable function object equivalent to the
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/// \c proto::make_expr() function.
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///
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/// In all cases, <tt>functional::make_expr\<Tag, Domain\>()(a0, ... aN)</tt>
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/// is equivalent to <tt>proto::make_expr\<Tag, Domain\>(a0, ... aN)</tt>.
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///
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/// <tt>functional::make_expr\<Tag\>()(a0, ... aN)</tt>
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/// is equivalent to <tt>proto::make_expr\<Tag\>(a0, ... aN)</tt>.
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template<typename Tag, typename Domain /* = deduce_domain*/>
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struct make_expr
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{
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BOOST_PROTO_CALLABLE()
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BOOST_PROTO_POLY_FUNCTION()
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template<typename Sig>
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struct result;
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template<typename This, typename A0>
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struct result<This(A0)>
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{
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typedef
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typename result_of::make_expr<
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Tag
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, Domain
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, A0
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>::type
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type;
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};
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/// Construct an expression node with tag type \c Tag
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/// and in the domain \c Domain.
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///
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/// \return <tt>proto::make_expr\<Tag, Domain\>(a0,...aN)</tt>
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template<typename A0>
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BOOST_FORCEINLINE
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typename result_of::make_expr<
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Tag
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, Domain
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, A0 const
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>::type const
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operator ()(A0 const &a0) const
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{
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return proto::detail::make_expr_<
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Tag
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, Domain
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, A0 const
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>()(a0);
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}
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// Additional overloads generated by the preprocessor ...
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#include <boost/proto/detail/make_expr_funop.hpp>
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/// INTERNAL ONLY
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///
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template<
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BOOST_PP_ENUM_BINARY_PARAMS(
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BOOST_PROTO_MAX_ARITY
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, typename A
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, = void BOOST_PP_INTERCEPT
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)
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>
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struct impl
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: detail::make_expr_<
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Tag
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, Domain
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BOOST_PP_ENUM_TRAILING_PARAMS(BOOST_PROTO_MAX_ARITY, A)
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>
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{};
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};
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/// \brief A callable function object equivalent to the
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/// \c proto::unpack_expr() function.
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///
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/// In all cases, <tt>functional::unpack_expr\<Tag, Domain\>()(seq)</tt>
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/// is equivalent to <tt>proto::unpack_expr\<Tag, Domain\>(seq)</tt>.
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///
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/// <tt>functional::unpack_expr\<Tag\>()(seq)</tt>
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/// is equivalent to <tt>proto::unpack_expr\<Tag\>(seq)</tt>.
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template<typename Tag, typename Domain /* = deduce_domain*/>
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struct unpack_expr
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{
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BOOST_PROTO_CALLABLE()
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template<typename Sig>
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struct result;
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template<typename This, typename Sequence>
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struct result<This(Sequence)>
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{
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typedef
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typename result_of::unpack_expr<
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Tag
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, Domain
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, typename remove_reference<Sequence>::type
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>::type
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type;
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};
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/// Construct an expression node with tag type \c Tag
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/// and in the domain \c Domain.
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///
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/// \param sequence A Fusion Forward Sequence
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/// \return <tt>proto::unpack_expr\<Tag, Domain\>(sequence)</tt>
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template<typename Sequence>
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BOOST_FORCEINLINE
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typename result_of::unpack_expr<Tag, Domain, Sequence const>::type const
|
||
|
|
operator ()(Sequence const &sequence) const
|
||
|
|
{
|
||
|
|
return proto::detail::unpack_expr_<
|
||
|
|
Tag
|
||
|
|
, Domain
|
||
|
|
, Sequence const
|
||
|
|
, fusion::result_of::size<Sequence>::type::value
|
||
|
|
>::call(sequence);
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
} // namespace functional
|
||
|
|
|
||
|
|
/// \brief Construct an expression of the requested tag type
|
||
|
|
/// with a domain and with the specified arguments as children.
|
||
|
|
///
|
||
|
|
/// This function template may be invoked either with or without
|
||
|
|
/// specifying a \c Domain argument. If no domain is specified,
|
||
|
|
/// the domain is deduced by examining in order the domains of
|
||
|
|
/// the given arguments and taking the first that is not
|
||
|
|
/// \c default_domain, if any such domain exists, or
|
||
|
|
/// \c default_domain otherwise.
|
||
|
|
///
|
||
|
|
/// Let \c wrap_(x) be defined such that:
|
||
|
|
/// \li If \c x is a <tt>boost::reference_wrapper\<\></tt>,
|
||
|
|
/// \c wrap_(x) is equivalent to <tt>as_child\<Domain\>(x.get())</tt>.
|
||
|
|
/// \li Otherwise, \c wrap_(x) is equivalent to
|
||
|
|
/// <tt>as_expr\<Domain\>(x)</tt>.
|
||
|
|
///
|
||
|
|
/// Let <tt>make_\<Tag\>(b0,...bN)</tt> be defined as
|
||
|
|
/// <tt>expr\<Tag, listN\<C0,...CN\> \>::make(c0,...cN)</tt>
|
||
|
|
/// where \c Bx is the type of \c bx.
|
||
|
|
///
|
||
|
|
/// \return <tt>Domain()(make_\<Tag\>(wrap_(a0),...wrap_(aN)))</tt>.
|
||
|
|
template<typename Tag, typename A0>
|
||
|
|
BOOST_FORCEINLINE
|
||
|
|
typename lazy_disable_if<
|
||
|
|
is_domain<A0>
|
||
|
|
, result_of::make_expr<
|
||
|
|
Tag
|
||
|
|
, A0 const
|
||
|
|
>
|
||
|
|
>::type const
|
||
|
|
make_expr(A0 const &a0)
|
||
|
|
{
|
||
|
|
return proto::detail::make_expr_<
|
||
|
|
Tag
|
||
|
|
, deduce_domain
|
||
|
|
, A0 const
|
||
|
|
>()(a0);
|
||
|
|
}
|
||
|
|
|
||
|
|
/// \overload
|
||
|
|
///
|
||
|
|
template<typename Tag, typename Domain, typename C0>
|
||
|
|
BOOST_FORCEINLINE
|
||
|
|
typename result_of::make_expr<
|
||
|
|
Tag
|
||
|
|
, Domain
|
||
|
|
, C0 const
|
||
|
|
>::type const
|
||
|
|
make_expr(C0 const &c0)
|
||
|
|
{
|
||
|
|
return proto::detail::make_expr_<
|
||
|
|
Tag
|
||
|
|
, Domain
|
||
|
|
, C0 const
|
||
|
|
>()(c0);
|
||
|
|
}
|
||
|
|
|
||
|
|
// Additional overloads generated by the preprocessor...
|
||
|
|
#include <boost/proto/detail/make_expr.hpp>
|
||
|
|
|
||
|
|
/// \brief Construct an expression of the requested tag type
|
||
|
|
/// with a domain and with childres from the specified Fusion
|
||
|
|
/// Forward Sequence.
|
||
|
|
///
|
||
|
|
/// This function template may be invoked either with or without
|
||
|
|
/// specifying a \c Domain argument. If no domain is specified,
|
||
|
|
/// the domain is deduced by examining in order the domains of the
|
||
|
|
/// elements of \c sequence and taking the first that is not
|
||
|
|
/// \c default_domain, if any such domain exists, or
|
||
|
|
/// \c default_domain otherwise.
|
||
|
|
///
|
||
|
|
/// Let \c s be a Fusion Random Access Sequence equivalent to \c sequence.
|
||
|
|
/// Let <tt>wrap_\<N\>(s)</tt>, where \c s has type \c S, be defined
|
||
|
|
/// such that:
|
||
|
|
/// \li If <tt>fusion::result_of::value_at_c\<S,N\>::type</tt> is a reference,
|
||
|
|
/// <tt>wrap_\<N\>(s)</tt> is equivalent to
|
||
|
|
/// <tt>as_child\<Domain\>(fusion::at_c\<N\>(s))</tt>.
|
||
|
|
/// \li Otherwise, <tt>wrap_\<N\>(s)</tt> is equivalent to
|
||
|
|
/// <tt>as_expr\<Domain\>(fusion::at_c\<N\>(s))</tt>.
|
||
|
|
///
|
||
|
|
/// Let <tt>make_\<Tag\>(b0,...bN)</tt> be defined as
|
||
|
|
/// <tt>expr\<Tag, listN\<B0,...BN\> \>::make(b0,...bN)</tt>
|
||
|
|
/// where \c Bx is the type of \c bx.
|
||
|
|
///
|
||
|
|
/// \param sequence a Fusion Forward Sequence.
|
||
|
|
/// \return <tt>Domain()(make_\<Tag\>(wrap_\<0\>(s),...wrap_\<N-1\>(s)))</tt>,
|
||
|
|
/// where N is the size of \c Sequence.
|
||
|
|
template<typename Tag, typename Sequence>
|
||
|
|
BOOST_FORCEINLINE
|
||
|
|
typename lazy_disable_if<
|
||
|
|
is_domain<Sequence>
|
||
|
|
, result_of::unpack_expr<Tag, Sequence const>
|
||
|
|
>::type const
|
||
|
|
unpack_expr(Sequence const &sequence)
|
||
|
|
{
|
||
|
|
return proto::detail::unpack_expr_<
|
||
|
|
Tag
|
||
|
|
, deduce_domain
|
||
|
|
, Sequence const
|
||
|
|
, fusion::result_of::size<Sequence>::type::value
|
||
|
|
>::call(sequence);
|
||
|
|
}
|
||
|
|
|
||
|
|
/// \overload
|
||
|
|
///
|
||
|
|
template<typename Tag, typename Domain, typename Sequence2>
|
||
|
|
BOOST_FORCEINLINE
|
||
|
|
typename result_of::unpack_expr<Tag, Domain, Sequence2 const>::type const
|
||
|
|
unpack_expr(Sequence2 const &sequence2)
|
||
|
|
{
|
||
|
|
return proto::detail::unpack_expr_<
|
||
|
|
Tag
|
||
|
|
, Domain
|
||
|
|
, Sequence2 const
|
||
|
|
, fusion::result_of::size<Sequence2>::type::value
|
||
|
|
>::call(sequence2);
|
||
|
|
}
|
||
|
|
|
||
|
|
/// INTERNAL ONLY
|
||
|
|
///
|
||
|
|
template<typename Tag, typename Domain>
|
||
|
|
struct is_callable<functional::make_expr<Tag, Domain> >
|
||
|
|
: mpl::true_
|
||
|
|
{};
|
||
|
|
|
||
|
|
/// INTERNAL ONLY
|
||
|
|
///
|
||
|
|
template<typename Tag, typename Domain>
|
||
|
|
struct is_callable<functional::unpack_expr<Tag, Domain> >
|
||
|
|
: mpl::true_
|
||
|
|
{};
|
||
|
|
|
||
|
|
}}
|
||
|
|
|
||
|
|
#if defined(_MSC_VER)
|
||
|
|
# pragma warning(pop)
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#endif // BOOST_PROTO_MAKE_EXPR_HPP_EAN_04_01_2005
|