311 lines
11 KiB
C++
311 lines
11 KiB
C++
///////////////////////////////////////////////////////////////////////////////
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/// \file repeat.hpp
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/// Contains macros to ease the generation of repetitious code constructs
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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_REPEAT_HPP_EAN_11_24_2008
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#define BOOST_PROTO_REPEAT_HPP_EAN_11_24_2008
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#include <boost/preprocessor/cat.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/iteration/local.hpp>
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#include <boost/preprocessor/tuple/elem.hpp>
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#include <boost/proto/proto_fwd.hpp> // for BOOST_PROTO_MAX_ARITY
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////////////////////////////////////////////
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/// INTERNAL ONLY
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#define BOOST_PROTO_ref_a_aux(Z, N, DATA)\
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boost::ref(BOOST_PP_CAT(proto_a, N))
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/// \brief Generates a sequence like <tt>typename A0, typename A1, ...</tt>
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///
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#define BOOST_PROTO_typename_A(N)\
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BOOST_PP_ENUM_PARAMS(N, typename proto_A)
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/// \brief Generates a sequence like <tt>A0 const &, A1 const &, ...</tt>
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///
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#define BOOST_PROTO_A_const_ref(N)\
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BOOST_PP_ENUM_BINARY_PARAMS(N, proto_A, const & BOOST_PP_INTERCEPT)
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/// \brief Generates a sequence like <tt>A0 &, A1 &, ...</tt>
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///
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#define BOOST_PROTO_A_ref(N)\
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BOOST_PP_ENUM_BINARY_PARAMS(N, proto_A, & BOOST_PP_INTERCEPT)
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/// \brief Generates a sequence like <tt>A0, A1, ...</tt>
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///
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#define BOOST_PROTO_A(N)\
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BOOST_PP_ENUM_PARAMS(N, proto_A)
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/// \brief Generates a sequence like <tt>A0 const, A1 const, ...</tt>
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///
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#define BOOST_PROTO_A_const(N)\
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BOOST_PP_ENUM_PARAMS(N, const proto_A)
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/// \brief Generates a sequence like <tt>A0 const &a0, A1 const &a0, ...</tt>
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///
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#define BOOST_PROTO_A_const_ref_a(N)\
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BOOST_PP_ENUM_BINARY_PARAMS(N, proto_A, const &proto_a)
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/// \brief Generates a sequence like <tt>A0 &a0, A1 &a0, ...</tt>
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///
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#define BOOST_PROTO_A_ref_a(N)\
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BOOST_PP_ENUM_BINARY_PARAMS(N, proto_A, &proto_a)
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/// \brief Generates a sequence like <tt>boost::ref(a0), boost::ref(a1), ...</tt>
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///
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#define BOOST_PROTO_ref_a(N)\
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BOOST_PP_ENUM(N, BOOST_PROTO_ref_a_aux, ~)
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/// \brief Generates a sequence like <tt>a0, a1, ...</tt>
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///
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#define BOOST_PROTO_a(N)\
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BOOST_PP_ENUM_PARAMS(N, proto_a)
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////////////////////////////////////////////
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/// INTERNAL ONLY
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#define BOOST_PROTO_invoke(Z, N, DATA)\
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BOOST_PP_TUPLE_ELEM(5,0,DATA)(N, BOOST_PP_TUPLE_ELEM(5,1,DATA), BOOST_PP_TUPLE_ELEM(5,2,DATA), BOOST_PP_TUPLE_ELEM(5,3,DATA), BOOST_PP_TUPLE_ELEM(5,4,DATA))
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/// \brief Repeatedly invoke the specified macro.
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///
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/// BOOST_PROTO_REPEAT_FROM_TO_EX() is used generate the kind of repetitive code that is typical
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/// of EDSLs built with Proto. BOOST_PROTO_REPEAT_FROM_TO_EX(FROM, TO, MACRO, typename_A, A, A_a, a) is equivalent to:
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///
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/// \code
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/// MACRO(FROM, typename_A, A, A_a, a)
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/// MACRO(FROM+1, typename_A, A, A_a, a)
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/// ...
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/// MACRO(TO-1, typename_A, A, A_a, a)
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/// \endcode
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#define BOOST_PROTO_REPEAT_FROM_TO_EX(FROM, TO, MACRO, typename_A, A, A_a, a)\
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BOOST_PP_REPEAT_FROM_TO(FROM, TO, BOOST_PROTO_invoke, (MACRO, typename_A, A, A_a, a))
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/// \brief Repeatedly invoke the specified macro.
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///
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/// BOOST_PROTO_REPEAT_FROM_TO() is used generate the kind of repetitive code that is typical
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/// of EDSLs built with Proto. BOOST_PROTO_REPEAT_FROM_TO(FROM, TO, MACRO) is equivalent to:
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///
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/// \code
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/// MACRO(FROM, BOOST_PROTO_typename_A, BOOST_PROTO_A_const_ref, BOOST_PROTO_A_const_ref_a, BOOST_PROTO_ref_a)
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/// MACRO(FROM+1, BOOST_PROTO_typename_A, BOOST_PROTO_A_const_ref, BOOST_PROTO_A_const_ref_a, BOOST_PROTO_ref_a)
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/// ...
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/// MACRO(TO-1, BOOST_PROTO_typename_A, BOOST_PROTO_A_const_ref, BOOST_PROTO_A_const_ref_a, BOOST_PROTO_ref_a)
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/// \endcode
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///
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/// Example:
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///
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/** \code
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// Generate BOOST_PROTO_MAX_ARITY-1 overloads of the
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// following construct() function template.
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#define M0(N, typename_A, A_const_ref, A_const_ref_a, ref_a) \
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template<typename T, typename_A(N)> \
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typename proto::result_of::make_expr< \
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proto::tag::function \
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, construct_helper<T> \
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, A_const_ref(N) \
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>::type const \
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construct(A_const_ref_a(N)) \
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{ \
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return proto::make_expr< \
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proto::tag::function \
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>( \
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construct_helper<T>() \
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, ref_a(N) \
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); \
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}
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BOOST_PROTO_REPEAT_FROM_TO(1, BOOST_PROTO_MAX_ARITY, M0)
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#undef M0
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\endcode
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**/
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/// The above invocation of BOOST_PROTO_REPEAT_FROM_TO() will generate
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/// the following code:
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///
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/// \code
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/// template<typename T, typename A0>
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/// typename proto::result_of::make_expr<
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/// proto::tag::function
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/// , construct_helper<T>
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/// , A0 const &
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/// >::type const
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/// construct(A0 const & a0)
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/// {
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/// return proto::make_expr<
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/// proto::tag::function
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/// >(
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/// construct_helper<T>()
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/// , boost::ref(a0)
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/// );
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/// }
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///
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/// template<typename T, typename A0, typename A1>
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/// typename proto::result_of::make_expr<
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/// proto::tag::function
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/// , construct_helper<T>
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/// , A0 const &
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/// , A1 const &
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/// >::type const
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/// construct(A0 const & a0, A1 const & a1)
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/// {
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/// return proto::make_expr<
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/// proto::tag::function
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/// >(
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/// construct_helper<T>()
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/// , boost::ref(a0)
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/// , boost::ref(a1)
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/// );
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/// }
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///
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/// // ... and so on, up to BOOST_PROTO_MAX_ARITY-1 arguments ...
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/// \endcode
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#define BOOST_PROTO_REPEAT_FROM_TO(FROM, TO, MACRO)\
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BOOST_PROTO_REPEAT_FROM_TO_EX(FROM, TO, MACRO, BOOST_PROTO_typename_A, BOOST_PROTO_A_const_ref, BOOST_PROTO_A_const_ref_a, BOOST_PROTO_ref_a)
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/// \brief Repeatedly invoke the specified macro.
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///
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/// BOOST_PROTO_REPEAT_EX() is used generate the kind of repetitive code that is typical
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/// of EDSLs built with Proto. BOOST_PROTO_REPEAT_EX(MACRO, typename_A, A, A_a, a) is equivalent to:
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///
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/// \code
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/// MACRO(1, typename_A, A, A_a, a)
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/// MACRO(2, typename_A, A, A_a, a)
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/// ...
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/// MACRO(BOOST_PROTO_MAX_ARITY, typename_A, A, A_a, a)
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/// \endcode
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#define BOOST_PROTO_REPEAT_EX(MACRO, typename_A, A, A_a, a)\
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BOOST_PROTO_REPEAT_FROM_TO_EX(1, BOOST_PP_INC(BOOST_PROTO_MAX_ARITY), MACRO, BOOST_PROTO_typename_A, BOOST_PROTO_A_const_ref, BOOST_PROTO_A_const_ref_a, BOOST_PROTO_ref_a)
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/// \brief Repeatedly invoke the specified macro.
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///
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/// BOOST_PROTO_REPEAT() is used generate the kind of repetitive code that is typical
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/// of EDSLs built with Proto. BOOST_PROTO_REPEAT(MACRO) is equivalent to:
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///
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/// \code
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/// MACRO(1, BOOST_PROTO_typename_A, BOOST_PROTO_A_const_ref, BOOST_PROTO_A_const_ref_a, BOOST_PROTO_ref_a)
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/// MACRO(2, BOOST_PROTO_typename_A, BOOST_PROTO_A_const_ref, BOOST_PROTO_A_const_ref_a, BOOST_PROTO_ref_a)
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/// ...
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/// MACRO(BOOST_PROTO_MAX_ARITY, BOOST_PROTO_typename_A, BOOST_PROTO_A_const_ref, BOOST_PROTO_A_const_ref_a, BOOST_PROTO_ref_a)
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/// \endcode
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#define BOOST_PROTO_REPEAT(MACRO)\
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BOOST_PROTO_REPEAT_FROM_TO(1, BOOST_PP_INC(BOOST_PROTO_MAX_ARITY), MACRO)
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/// \brief Repeatedly invoke the specified macro.
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///
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/// BOOST_PROTO_LOCAL_ITERATE() is used generate the kind of repetitive code that is typical
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/// of EDSLs built with Proto. This macro causes the user-defined macro BOOST_PROTO_LOCAL_MACRO to
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/// be expanded with values in the range specified by BOOST_PROTO_LOCAL_LIMITS.
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///
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/// Usage:
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///
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/// \code
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/// #include BOOST_PROTO_LOCAL_ITERATE()
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/// \endcode
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///
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/// Example:
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///
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/** \code
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// Generate BOOST_PROTO_MAX_ARITY-1 overloads of the
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// following construct() function template.
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#define BOOST_PROTO_LOCAL_MACRO(N, typename_A, A_const_ref, \
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A_const_ref_a, ref_a) \
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template<typename T, typename_A(N)> \
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typename proto::result_of::make_expr< \
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proto::tag::function \
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, construct_helper<T> \
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, A_const_ref(N) \
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>::type const \
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construct(A_const_ref_a(N)) \
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{ \
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return proto::make_expr< \
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proto::tag::function \
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>( \
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construct_helper<T>() \
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, ref_a(N) \
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); \
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}
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#define BOOST_PROTO_LOCAL_LIMITS (1, BOOST_PP_DEC(BOOST_PROTO_MAX_ARITY))
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#include BOOST_PROTO_LOCAL_ITERATE()
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\endcode
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**/
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/// The above inclusion of BOOST_PROTO_LOCAL_ITERATE() will generate
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/// the following code:
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///
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/// \code
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/// template<typename T, typename A0>
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/// typename proto::result_of::make_expr<
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/// proto::tag::function
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/// , construct_helper<T>
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/// , A0 const &
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/// >::type const
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/// construct(A0 const & a0)
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/// {
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/// return proto::make_expr<
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/// proto::tag::function
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/// >(
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/// construct_helper<T>()
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/// , boost::ref(a0)
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/// );
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/// }
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///
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/// template<typename T, typename A0, typename A1>
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/// typename proto::result_of::make_expr<
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/// proto::tag::function
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/// , construct_helper<T>
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/// , A0 const &
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/// , A1 const &
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/// >::type const
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/// construct(A0 const & a0, A1 const & a1)
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/// {
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/// return proto::make_expr<
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/// proto::tag::function
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/// >(
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/// construct_helper<T>()
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/// , boost::ref(a0)
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/// , boost::ref(a1)
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/// );
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/// }
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///
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/// // ... and so on, up to BOOST_PROTO_MAX_ARITY-1 arguments ...
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/// \endcode
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///
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/// If BOOST_PROTO_LOCAL_LIMITS is not defined by the user, it defaults
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/// to (1, BOOST_PROTO_MAX_ARITY)
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///
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/// At each iteration, BOOST_PROTO_LOCAL_MACRO is invoked with the current
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/// iteration number and the following 4 macro parameters:
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///
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/// \li BOOST_PROTO_LOCAL_typename_A
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/// \li BOOST_PROTO_LOCAL_A
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/// \li BOOST_PROTO_LOCAL_A_a
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/// \li BOOST_PROTO_LOCAL_a
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///
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/// If these macros are not defined by the user, they default respectively to:
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///
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/// \li BOOST_PROTO_typename_A
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/// \li BOOST_PROTO_A_const_ref
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/// \li BOOST_PROTO_A_const_ref_a
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/// \li BOOST_PROTO_ref_a
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///
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/// After including BOOST_PROTO_LOCAL_ITERATE(), the following macros are
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/// automatically undefined:
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///
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/// \li BOOST_PROTO_LOCAL_MACRO
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/// \li BOOST_PROTO_LOCAL_LIMITS
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/// \li BOOST_PROTO_LOCAL_typename_A
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/// \li BOOST_PROTO_LOCAL_A
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/// \li BOOST_PROTO_LOCAL_A_a
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/// \li BOOST_PROTO_LOCAL_a
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#define BOOST_PROTO_LOCAL_ITERATE() <boost/proto/detail/local.hpp>
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#endif
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