boost/functional/value_factory.hpp

   1 /*=============================================================================
   2     Copyright (c) 2007 Tobias Schwinger
   3
   4     Use modification and distribution are subject to the Boost Software
   5     License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
   6     http://www.boost.org/LICENSE_1_0.txt).
   7 ==============================================================================*/
   8
   9 #ifndef BOOST_FUNCTIONAL_VALUE_FACTORY_HPP_INCLUDED
  10 #   ifndef BOOST_PP_IS_ITERATING
  11
  12 #     include <boost/preprocessor/iteration/iterate.hpp>
  13 #     include <boost/preprocessor/repetition/enum_params.hpp>
  14 #     include <boost/preprocessor/repetition/enum_binary_params.hpp>
  15
  16 #     include <new>
  17 #     include <boost/pointee.hpp>
  18 #     include <boost/none_t.hpp>
  19 #     include <boost/get_pointer.hpp>
  20 #     include <boost/non_type.hpp>
  21 #     include <boost/type_traits/remove_cv.hpp>
  22
  23 #     ifndef BOOST_FUNCTIONAL_VALUE_FACTORY_MAX_ARITY
  24 #       define BOOST_FUNCTIONAL_VALUE_FACTORY_MAX_ARITY 10
  25 #     elif BOOST_FUNCTIONAL_VALUE_FACTORY_MAX_ARITY < 3
  26 #       undef  BOOST_FUNCTIONAL_VALUE_FACTORY_MAX_ARITY
  27 #       define BOOST_FUNCTIONAL_VALUE_FACTORY_MAX_ARITY 3
  28 #     endif
  29
  30 namespace boost
  31 {
  32     template< typename T >
  33     class value_factory;
  34
  35     //----- ---- --- -- - -  -   -
  36
  37     template< typename T >
  38     class value_factory
  39     {
  40       public:
  41         typedef T result_type;
  42
  43         value_factory()
  44         { }
  45
  46 #     define BOOST_PP_FILENAME_1 <boost/functional/value_factory.hpp>
  47 #     define BOOST_PP_ITERATION_LIMITS (0,BOOST_FUNCTIONAL_VALUE_FACTORY_MAX_ARITY)
  48 #     include BOOST_PP_ITERATE()
  49     };
  50
  51     template< typename T > class value_factory<T&>;
  52     // forbidden, would create a dangling reference
  53 }
  54 #     define BOOST_FUNCTIONAL_VALUE_FACTORY_HPP_INCLUDED
  55 #   else // defined(BOOST_PP_IS_ITERATING)
  56
  57 #     define N BOOST_PP_ITERATION()
  58 #     if N > 0
  59     template< BOOST_PP_ENUM_PARAMS(N, typename T) >
  60 #     endif
  61     inline result_type operator()(BOOST_PP_ENUM_BINARY_PARAMS(N,T,& a)) const
  62     {
  63         return result_type(BOOST_PP_ENUM_PARAMS(N,a));
  64     }
  65 #     undef N
  66
  67 #   endif // defined(BOOST_PP_IS_ITERATING)
  68
  69 #endif // include guard
  70