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