ceph/src/boost/boost/msm/back/bind_helpers.hpp

   1 // Copyright 2008 Christophe Henry
   2 // henry UNDERSCORE christophe AT hotmail DOT com
   3 // This is an extended version of the state machine available in the boost::mpl library
   4 // Distributed under the same license as the original.
   5 // Copyright for the original version:
   6 // Copyright 2005 David Abrahams and Aleksey Gurtovoy. Distributed
   7 // under the Boost Software License, Version 1.0. (See accompanying
   8 // file LICENSE_1_0.txt or copy at
   9 // http://www.boost.org/LICENSE_1_0.txt)
  10
  11 #ifndef BOOST_MSM_BACK_BIND_HELPERS_H
  12 #define BOOST_MSM_BACK_BIND_HELPERS_H
  13
  14 #include <functional>
  15
  16 namespace boost { namespace msm { namespace back
  17 {
  18     // helper to replace std::plus as the lack of implicit conversion makes it not usable in one of our bind
  19     template<class _Ty,class _Tz>
  20     struct plus2
  21         : public std::binary_function<_Ty, _Tz, _Ty>
  22     {
  23         // functor for operator+
  24         _Ty operator()( _Ty _Left, _Tz _Right) const
  25         {
  26             // apply operator+ to operands
  27             return (_Left + _Right);
  28         }
  29     };
  30     // helper to dereference a pointer to a function pointer
  31     template <class T>
  32     struct deref
  33     {
  34         typedef T& result_type;
  35         T& operator()(T*  f) const
  36         {
  37             return *f;
  38         }
  39     };
  40 } } }//boost::msm::back
  41 #endif //BOOST_MSM_BACK_BIND_HELPERS_H