ceph/src/boost/boost/proto/detail/template_arity.hpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 /// \file template_arity.hpp
   3 /// Replace all nodes stored by reference by nodes stored by value.
   4 //
   5 //  Copyright 2011 Eric Niebler. Distributed under the Boost
   6 //  Software License, Version 1.0. (See accompanying file
   7 //  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   8 //
   9 //  This file is based on a similar one in MPL from Aleksey Gurtovoy.
  10
  11 #ifndef BOOST_PROTO_DETAIL_TEMPLATE_ARITY_HPP_EAN_2011_05_07
  12 #define BOOST_PROTO_DETAIL_TEMPLATE_ARITY_HPP_EAN_2011_05_07
  13
  14 // Somewhat indirect definition of BOOST_PROTO_TEMPLATE_ARITY_PARAM is
  15 // to overcome a shortcoming of the Wave tool used to generate the
  16 // pre-preprocessed headers.
  17 #define BOOST_PROTO_TEMPLATE_ARITY_PARAM BOOST_PROTO_TEMPLATE_ARITY_PARAM2
  18 #define BOOST_PROTO_TEMPLATE_ARITY_PARAM2(param)
  19
  20 #if defined(BOOST_PROTO_EXTENDED_TEMPLATE_PARAMETERS_MATCHING) ||                                   \
  21   (defined(__WAVE__) && defined(BOOST_PROTO_CREATE_PREPROCESSED_FILES))
  22
  23 #include <boost/preprocessor/cat.hpp>
  24 #include <boost/preprocessor/inc.hpp>
  25 #include <boost/preprocessor/iteration/iterate.hpp>
  26 #include <boost/preprocessor/repetition/enum_params.hpp>
  27 #include <boost/mpl/int.hpp>
  28 #include <boost/proto/proto_fwd.hpp>
  29
  30 #undef BOOST_PROTO_TEMPLATE_ARITY_PARAM2
  31 #define BOOST_PROTO_TEMPLATE_ARITY_PARAM2(param) , param
  32
  33 namespace boost { namespace proto { namespace detail
  34 {
  35     sized_type<1>::type template_arity_helper(...);
  36
  37     // Other overloads generated by the preprocessor
  38     #include <boost/proto/detail/template_arity_helper.hpp>
  39
  40     template<typename F, int N, int Size>
  41     struct template_arity_impl2
  42       : mpl::int_<Size - 1>
  43     {};
  44
  45     template<typename F, int N = BOOST_PROTO_MAX_ARITY>
  46     struct template_arity
  47       : template_arity_impl2<
  48             F
  49           , N
  50           , sizeof(detail::template_arity_helper((F **)0, (mpl::int_<N> *)0))
  51         >
  52     {};
  53
  54     template<typename F, int N>
  55     struct template_arity_impl2<F, N, 1>
  56       : template_arity<F, N-1>
  57     {};
  58
  59     template<typename F>
  60     struct template_arity_impl2<F, 0, 1>
  61       : mpl::int_<-1>
  62     {};
  63
  64 }}}
  65
  66 #endif // BOOST_PROTO_EXTENDED_TEMPLATE_PARAMETERS_MATCHING
  67 #endif // BOOST_PROTO_DETAIL_TEMPLATE_ARITY_HPP_EAN_2011_05_07