ceph/src/boost/boost/spirit/home/x3/support/utility/lambda_visitor.hpp

   1 /*=============================================================================
   2     Copyright (c) 2014 Joel de Guzman
   3
   4     Distributed under the Boost Software License, Version 1.0. (See accompanying
   5     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   6 ==============================================================================*/
   7 #if !defined(BOOST_SPIRIT_X3_LAMBDA_VISITOR_MAY_19_2014_1116AM)
   8 #define BOOST_SPIRIT_X3_LAMBDA_VISITOR_MAY_19_2014_1116AM
   9
  10 namespace boost { namespace spirit { namespace x3
  11 {
  12     template <typename RT, typename... Lambdas>
  13     struct lambda_visitor;
  14
  15     template <typename RT, typename F, typename... Lambdas>
  16     struct lambda_visitor<RT, F, Lambdas...> : F, lambda_visitor<RT, Lambdas...>
  17     {
  18         typedef lambda_visitor<RT , Lambdas...> base_type;
  19         using F::operator();
  20         using base_type::operator();
  21         lambda_visitor(F f, Lambdas... lambdas)
  22           : F(f), base_type(lambdas...)
  23         {}
  24     };
  25
  26     template <typename RT, typename F>
  27     struct lambda_visitor<RT, F> : F
  28     {
  29         typedef RT result_type;
  30         using F::operator();
  31         lambda_visitor(F f)
  32           : F(f)
  33         {}
  34     };
  35
  36     template <typename RT>
  37     struct lambda_visitor<RT>
  38     {
  39         typedef RT result_type;
  40     };
  41
  42     template <typename RT, typename... Lambdas>
  43     lambda_visitor<RT, Lambdas...> make_lambda_visitor(Lambdas... lambdas)
  44     {
  45         return { lambdas... };
  46     }
  47 }}}
  48
  49 #endif