Boost C++ Libraries of the most highly regarded and expertly designed C++ library projects in the world. Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

This is the documentation for an old version of Boost. Click here to view this page for the latest version.


// Copyright 2008 Christophe Henry
// henry UNDERSCORE christophe AT hotmail DOT com
// This is an extended version of the state machine available in the boost::mpl library
// Distributed under the same license as the original.
// Copyright for the original version:
// Copyright 2005 David Abrahams and Aleksey Gurtovoy. Distributed
// under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at


#include <functional>

namespace boost { namespace msm { namespace back
    // helper to replace std::plus as the lack of implicit conversion makes it not usable in one of our bind
    template<class _Ty,class _Tz>
    struct plus2
        : public std::binary_function<_Ty, _Tz, _Ty>
        // functor for operator+
        _Ty operator()( _Ty _Left, _Tz _Right) const
            // apply operator+ to operands
            return (_Left + _Right);
    // helper to dereference a pointer to a function pointer
    template <class T>
    struct deref 
        typedef T& result_type;
        T& operator()(T*  f) const
            return *f;
} } }//boost::msm::back