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222 lines
8.9 KiB
222 lines
8.9 KiB
3 years ago
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#if !defined(BOOST_PROTO_DONT_USE_PREPROCESSED_FILES)
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#include <boost/proto/detail/preprocessed/traits.hpp>
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#elif !defined(BOOST_PP_IS_ITERATING)
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#define BOOST_PROTO_CHILD(Z, N, DATA) \
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/** INTERNAL ONLY */ \
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typedef BOOST_PP_CAT(DATA, N) BOOST_PP_CAT(proto_child, N); \
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/**/
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#if defined(__WAVE__) && defined(BOOST_PROTO_CREATE_PREPROCESSED_FILES)
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#pragma wave option(preserve: 2, line: 0, output: "preprocessed/traits.hpp")
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#endif
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///////////////////////////////////////////////////////////////////////////////
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/// \file traits.hpp
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/// Definitions of proto::function, proto::nary_expr and proto::result_of::child_c
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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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#if defined(__WAVE__) && defined(BOOST_PROTO_CREATE_PREPROCESSED_FILES)
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#pragma wave option(preserve: 1)
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#endif
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#define BOOST_PP_ITERATION_PARAMS_1 \
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(3, (0, BOOST_PROTO_MAX_ARITY, <boost/proto/detail/traits.hpp>))
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#include BOOST_PP_ITERATE()
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#if defined(__WAVE__) && defined(BOOST_PROTO_CREATE_PREPROCESSED_FILES)
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#pragma wave option(output: null)
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#endif
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#undef BOOST_PROTO_CHILD
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#else // BOOST_PP_IS_ITERATING
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#define N BOOST_PP_ITERATION()
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#if N > 0
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/// \brief A metafunction for generating function-call expression types,
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/// a grammar element for matching function-call expressions, and a
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/// PrimitiveTransform that dispatches to the <tt>pass_through\<\></tt>
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/// transform.
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template<BOOST_PP_ENUM_PARAMS(N, typename A)>
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struct function
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#if N != BOOST_PROTO_MAX_ARITY
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<
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BOOST_PP_ENUM_PARAMS(N, A)
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BOOST_PP_ENUM_TRAILING_PARAMS(BOOST_PP_SUB(BOOST_PROTO_MAX_ARITY, N), void BOOST_PP_INTERCEPT)
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>
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#endif
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: proto::transform<
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function<
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BOOST_PP_ENUM_PARAMS(N, A)
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BOOST_PP_ENUM_TRAILING_PARAMS(BOOST_PP_SUB(BOOST_PROTO_MAX_ARITY, N), void BOOST_PP_INTERCEPT)
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>
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, int
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>
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{
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typedef proto::expr<proto::tag::function, BOOST_PP_CAT(list, N)<BOOST_PP_ENUM_PARAMS(N, A)>, N> type;
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typedef proto::basic_expr<proto::tag::function, BOOST_PP_CAT(list, N)<BOOST_PP_ENUM_PARAMS(N, A)>, N> proto_grammar;
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template<typename Expr, typename State, typename Data>
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struct impl
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: detail::pass_through_impl<function, deduce_domain, Expr, State, Data>
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{};
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/// INTERNAL ONLY
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typedef proto::tag::function proto_tag;
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BOOST_PP_REPEAT(N, BOOST_PROTO_CHILD, A)
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BOOST_PP_REPEAT_FROM_TO(
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N
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, BOOST_PROTO_MAX_ARITY
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, BOOST_PROTO_CHILD
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, detail::if_vararg<BOOST_PP_CAT(A, BOOST_PP_DEC(N))> BOOST_PP_INTERCEPT
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)
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};
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/// \brief A metafunction for generating n-ary expression types with a
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/// specified tag type,
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/// a grammar element for matching n-ary expressions, and a
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/// PrimitiveTransform that dispatches to the <tt>pass_through\<\></tt>
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/// transform.
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///
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/// Use <tt>nary_expr\<_, vararg\<_\> \></tt> as a grammar element to match any
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/// n-ary expression; that is, any non-terminal.
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template<typename Tag BOOST_PP_ENUM_TRAILING_PARAMS(N, typename A)>
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struct nary_expr
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#if N != BOOST_PROTO_MAX_ARITY
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<
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Tag
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BOOST_PP_ENUM_TRAILING_PARAMS(N, A)
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BOOST_PP_ENUM_TRAILING_PARAMS(BOOST_PP_SUB(BOOST_PROTO_MAX_ARITY, N), void BOOST_PP_INTERCEPT)
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>
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#endif
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: proto::transform<
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nary_expr<
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Tag
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BOOST_PP_ENUM_TRAILING_PARAMS(N, A)
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BOOST_PP_ENUM_TRAILING_PARAMS(BOOST_PP_SUB(BOOST_PROTO_MAX_ARITY, N), void BOOST_PP_INTERCEPT)
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>
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, int
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>
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{
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typedef proto::expr<Tag, BOOST_PP_CAT(list, N)<BOOST_PP_ENUM_PARAMS(N, A)>, N> type;
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typedef proto::basic_expr<Tag, BOOST_PP_CAT(list, N)<BOOST_PP_ENUM_PARAMS(N, A)>, N> proto_grammar;
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template<typename Expr, typename State, typename Data>
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struct impl
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: detail::pass_through_impl<nary_expr, deduce_domain, Expr, State, Data>
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{};
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/// INTERNAL ONLY
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typedef Tag proto_tag;
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BOOST_PP_REPEAT(N, BOOST_PROTO_CHILD, A)
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BOOST_PP_REPEAT_FROM_TO(
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N
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, BOOST_PROTO_MAX_ARITY
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, BOOST_PROTO_CHILD
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, detail::if_vararg<BOOST_PP_CAT(A, BOOST_PP_DEC(N))> BOOST_PP_INTERCEPT
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)
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};
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namespace detail
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{
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template<
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template<BOOST_PP_ENUM_PARAMS(N, typename BOOST_PP_INTERCEPT)> class T
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, BOOST_PP_ENUM_PARAMS(N, typename A)
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>
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struct is_callable_<T<BOOST_PP_ENUM_PARAMS(N, A)> BOOST_PROTO_TEMPLATE_ARITY_PARAM(N)>
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: is_same<BOOST_PP_CAT(A, BOOST_PP_DEC(N)), callable>
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{};
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}
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#endif
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namespace result_of
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{
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/// \brief A metafunction that returns the type of the Nth child
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/// of a Proto expression.
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///
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/// A metafunction that returns the type of the Nth child
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/// of a Proto expression. \c N must be less than
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/// \c Expr::proto_arity::value.
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template<typename Expr>
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struct child_c<Expr, N>
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{
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/// Verify that we are not operating on a terminal
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BOOST_STATIC_ASSERT(0 != Expr::proto_arity_c);
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/// The raw type of the Nth child as it is stored within
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/// \c Expr. This may be a value or a reference
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typedef typename Expr::BOOST_PP_CAT(proto_child, N) value_type;
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/// The "value" type of the child, suitable for return by value,
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/// computed as follows:
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/// \li <tt>T const &</tt> becomes <tt>T</tt>
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/// \li <tt>T &</tt> becomes <tt>T</tt>
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/// \li <tt>T</tt> becomes <tt>T</tt>
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typedef typename detail::expr_traits<typename Expr::BOOST_PP_CAT(proto_child, N)>::value_type type;
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};
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template<typename Expr>
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struct child_c<Expr &, N>
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{
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/// Verify that we are not operating on a terminal
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BOOST_STATIC_ASSERT(0 != Expr::proto_arity_c);
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/// The raw type of the Nth child as it is stored within
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/// \c Expr. This may be a value or a reference
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typedef typename Expr::BOOST_PP_CAT(proto_child, N) value_type;
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/// The "reference" type of the child, suitable for return by
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/// reference, computed as follows:
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/// \li <tt>T const &</tt> becomes <tt>T const &</tt>
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/// \li <tt>T &</tt> becomes <tt>T &</tt>
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/// \li <tt>T</tt> becomes <tt>T &</tt>
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typedef typename detail::expr_traits<typename Expr::BOOST_PP_CAT(proto_child, N)>::reference type;
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/// INTERNAL ONLY
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///
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BOOST_FORCEINLINE
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static type call(Expr &e)
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{
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return e.proto_base().BOOST_PP_CAT(child, N);
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}
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};
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template<typename Expr>
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struct child_c<Expr const &, N>
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{
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/// Verify that we are not operating on a terminal
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BOOST_STATIC_ASSERT(0 != Expr::proto_arity_c);
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/// The raw type of the Nth child as it is stored within
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/// \c Expr. This may be a value or a reference
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typedef typename Expr::BOOST_PP_CAT(proto_child, N) value_type;
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/// The "const reference" type of the child, suitable for return by
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/// const reference, computed as follows:
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/// \li <tt>T const &</tt> becomes <tt>T const &</tt>
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/// \li <tt>T &</tt> becomes <tt>T &</tt>
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/// \li <tt>T</tt> becomes <tt>T const &</tt>
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typedef typename detail::expr_traits<typename Expr::BOOST_PP_CAT(proto_child, N)>::const_reference type;
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/// INTERNAL ONLY
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///
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BOOST_FORCEINLINE
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static type call(Expr const &e)
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{
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return e.proto_base().BOOST_PP_CAT(child, N);
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}
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};
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}
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#undef N
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#endif
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