text: 
  // Copyright (C) 2009-2012 Lorenzo Caminiti
  // Distributed under the Boost Software License, Version 1.0
  // (see accompanying file LICENSE_1_0.txt or a copy at
  // http://www.boost.org/LICENSE_1_0.txt)
  // Home at http://www.boost.org/libs/local_function
  
  #ifndef BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_APPEND_HPP_
  #define BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_APPEND_HPP_
  
  #include <boost/local_function/aux_/preprocessor/traits/decl_returns.hpp>
  #include <boost/local_function/aux_/preprocessor/traits/decl_params.hpp>
  #include <boost/local_function/aux_/preprocessor/traits/decl_const_binds.hpp>
  #include <boost/local_function/aux_/preprocessor/traits/decl_binds.hpp>
  #include <boost/local_function/aux_/preprocessor/traits/decl_error.hpp>
  #include <boost/local_function/aux_/preprocessor/traits/param.hpp>
  #include <boost/local_function/detail/preprocessor/keyword/return.hpp>
  #include <boost/preprocessor/facilities/empty.hpp>
  #include <boost/preprocessor/arithmetic/dec.hpp>
  #include <boost/preprocessor/list/append.hpp>
  #include <boost/preprocessor/list/size.hpp>
  #include <boost/preprocessor/list/at.hpp>
  #include <boost/preprocessor/list/first_n.hpp>
  
  // PRIVATE //
  
  #define BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_APPEND_PARAM_DEFAULT_( \
          params, default_value) \
      /* `DEC` ok because precondition that unbinds are not nil-list */ \
      BOOST_PP_LIST_APPEND( \
          BOOST_PP_LIST_FIRST_N(BOOST_PP_DEC(BOOST_PP_LIST_SIZE(params)), \
                  params) \
      , \
          ( /* list 2-tuple */ \
              ( /* (param_decl, default) 2-tuple */ \
                  BOOST_LOCAL_FUNCTION_AUX_PP_PARAM_TRAITS_DECL( \
                          BOOST_PP_LIST_AT(params, BOOST_PP_DEC( \
                                  BOOST_PP_LIST_SIZE(params)))) \
              , \
                  default_value BOOST_PP_EMPTY \
              ) \
          , \
              BOOST_PP_NIL \
          ) \
      )
  
  // PUBLIC //
  
  // return_type: `return result_type`.
  #define BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_APPEND_RETURN( \
          decl_traits, return_type) \
      ( /* returns */ \
          BOOST_PP_LIST_APPEND( \
                  BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_RETURNS(decl_traits), \
                  ( BOOST_LOCAL_FUNCTION_DETAIL_PP_KEYWORD_RETURN_REMOVE_FRONT( \
                    return_type), BOOST_PP_NIL ) ) \
      , /* params and defaults */ \
          BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_PARAMS(decl_traits) \
      , /* const-bind vars */ \
          BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_CONST_BINDS(decl_traits) \
      , /* const-bind `this` types */ \
          BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_CONST_BIND_THIS_TYPES( \
                  decl_traits) \
      , /* bind vars */ \
          BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_BINDS(decl_traits) \
      , /* bind `this` types */ \
          BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_BIND_THIS_TYPES(decl_traits) \
      , /* error message (if any) */ \
          BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_ERROR(decl_traits) \
      )
  
  
  // param_decl: `[auto | register] type_ name_`.
  #define BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_APPEND_PARAM( \
          decl_traits, param_decl) \
      ( /* returns */ \
          BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_RETURNS(decl_traits) \
      , /* params and defaults */ \
          BOOST_PP_LIST_APPEND( \
                  BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_PARAMS(decl_traits), \
                  /* append param (with no default -- EMPTY) */ \
                  ( (param_decl, BOOST_PP_EMPTY), BOOST_PP_NIL ) ) \
      , /* const-bind vars */ \
          BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_CONST_BINDS(decl_traits) \
      , /* const-bind `this` types */ \
          BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_CONST_BIND_THIS_TYPES( \
                  decl_traits) \
      , /* bind vars */ \
          BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_BINDS(decl_traits) \
      , /* bind `this` types */ \
          BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_BIND_THIS_TYPES(decl_traits) \
      , /* error message (if any) */ \
          BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_ERROR(decl_traits) \
      )
  
  // default_value: a valid parameter default value (`-1`, etc).
  // Precondition: already added unbinds are not nil-list.
  #define BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_APPEND_PARAM_DEFAULT( \
          decl_traits, default_value) \
      ( /* returns */ \
          BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_RETURNS(decl_traits) \
      , /* unbind params and defaults */ \
          BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_APPEND_PARAM_DEFAULT_( \
                  BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_PARAMS(decl_traits), \
                  default_value) /* append default to last added param */ \
      , /* const-bind vars */ \
          BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_CONST_BINDS(decl_traits) \
      , /* const-bind `this` types */ \
          BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_CONST_BIND_THIS_TYPES( \
                  decl_traits) \
      , /* bind vars */ \
          BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_BINDS(decl_traits) \
      , /* bind `this` types */ \
          BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_BIND_THIS_TYPES(decl_traits) \
      , /* error message (if any) */ \
          BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_ERROR(decl_traits) \
      )
  
  // var_without_type: `[&] var_` (var_ != this).
  // var_with_type: `PP_EMPTY | type [&] var_` (var_ != this).
  #define BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_APPEND_BIND( \
          decl_traits, var_without_type, var_with_type) \
      ( /* returns */ \
          BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_RETURNS(decl_traits) \
      , /* params and defaults */ \
          BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_PARAMS(decl_traits) \
      , /* const-bind vars */ \
          BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_CONST_BINDS(decl_traits) \
      , /* const-bind `this` types */ \
          BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_CONST_BIND_THIS_TYPES( \
                  decl_traits) \
      , /* bind vars */ \
          BOOST_PP_LIST_APPEND( \
                  BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_BINDS(decl_traits), \
                  ( (var_without_type, var_with_type), BOOST_PP_NIL ) ) \
      , /* bind `this` types */ \
          BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_BIND_THIS_TYPES(decl_traits) \
      , /* error message (if any) */ \
          BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_ERROR(decl_traits) \
      )
  
  // this_type: `PP_EMPTY | type`.
  #define BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_APPEND_BIND_THIS_TYPE( \
          decl_traits, this_type) \
      ( /* returns */ \
          BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_RETURNS(decl_traits) \
      , /* params and defaults */ \
          BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_PARAMS(decl_traits) \
      , /* const-bind vars */ \
          BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_CONST_BINDS(decl_traits) \
      , /* const-bind `this` types */ \
          BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_CONST_BIND_THIS_TYPES( \
                  decl_traits) \
      , /* bind vars */ \
          BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_BINDS(decl_traits) \
      , /* bind `this` types */ \
          BOOST_PP_LIST_APPEND( \
                  BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_BIND_THIS_TYPES( \
                          decl_traits), \
                  ( (this_type), BOOST_PP_NIL ) ) \
      , /* error message (if any) */ \
          BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_ERROR(decl_traits) \
      ) 
  
  // var_without_type: `[&] var_` (var_ != this).
  // var_with_type: `BOOST_PP_EMPTY | type_ [&] name_` (var_ != this).
  #define BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_APPEND_CONST_BIND( \
          decl_traits, var_without_type, var_with_type) \
      ( /* returns */ \
          BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_RETURNS(decl_traits) \
      , /* params and defaults */ \
          BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_PARAMS(decl_traits) \
      , /* const-bind vars */ \
          BOOST_PP_LIST_APPEND( \
                  BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_CONST_BINDS( \
                          decl_traits), \
                  ( (var_without_type, var_with_type), BOOST_PP_NIL ) ) \
      , /* const-bind `this` types */ \
          BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_CONST_BIND_THIS_TYPES( \
                  decl_traits) \
      , /* bind vars */ \
          BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_BINDS(decl_traits) \
      , /* bind `this` types */ \
          BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_BIND_THIS_TYPES(decl_traits) \
      , /* error message (if any) */ \
          BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_ERROR(decl_traits) \
      ) 
  
  // this_type: `PP_EMPTY | type`.
  #define BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_APPEND_CONST_BIND_THIS_TYPE( \
          decl_traits, this_type) \
      ( /* returns */ \
          BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_RETURNS(decl_traits) \
      , /* params and defaults */ \
          BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_PARAMS(decl_traits) \
      , /* const-bind vars */ \
          BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_CONST_BINDS(decl_traits) \
      , /* const-bind `this` types */ \
          BOOST_PP_LIST_APPEND( \
                  BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_CONST_BIND_THIS_TYPES( \
                          decl_traits), \
                  ( (this_type), BOOST_PP_NIL ) ) \
      , /* bind vars */ \
          BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_BINDS(decl_traits) \
      , /* bind `this` types */ \
          BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_BIND_THIS_TYPES(decl_traits) \
      , /* error message (if any) */ \
          BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_ERROR(decl_traits) \
      )
  
  #endif // #include guard
  
  