boost/function_types/function_arity.hpp

   1
   2 // (C) Copyright Tobias Schwinger
   3 //
   4 // Use modification and distribution are subject to the boost Software License,
   5 // Version 1.0. (See http://www.boost.org/LICENSE_1_0.txt).
   6
   7 //------------------------------------------------------------------------------
   8
   9 #ifndef BOOST_FT_FUNCTION_ARITY_HPP_INCLUDED
  10 #define BOOST_FT_FUNCTION_ARITY_HPP_INCLUDED
  11
  12 #include <boost/blank.hpp>
  13 #include <boost/mpl/if.hpp>
  14
  15 #include <boost/mpl/aux_/lambda_support.hpp>
  16 #include <boost/type_traits/detail/template_arity_spec.hpp>
  17
  18 #include <boost/function_types/is_callable_builtin.hpp>
  19 #include <boost/function_types/components.hpp>
  20
  21 namespace boost
  22 {
  23   namespace function_types
  24   {
  25     template<typename T> struct function_arity
  26       : mpl::if_
  27         < function_types::is_callable_builtin<T>
  28         , typename components<T>::function_arity, boost::blank
  29         >::type
  30     {
  31       BOOST_MPL_AUX_LAMBDA_SUPPORT(1,function_arity,(T))
  32     };
  33   }
  34   BOOST_TT_AUX_TEMPLATE_ARITY_SPEC(1,function_types::function_arity)
  35 }
  36
  37 #endif
  38