FunctorSignature.hpp

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///////////////////////////////////////////////////////////////////////////////
//
// File: FunctorSignature.hpp
//
// For more information, please see: http://www.nektar.info
//
// The MIT License
//
// Copyright (c) 2006 Division of Applied Mathematics, Brown University (USA),
// Department of Aeronautics, Imperial College London (UK), and Scientific
// Computing and Imaging Institute, University of Utah (USA).
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
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// The above copyright notice and this permission notice shall be included
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//
// Description: Add registration for functors using lambdas in boost::python
//
///////////////////////////////////////////////////////////////////////////////
 
#ifndef NEKTAR_LIBRARY_LIBUTILITIES_PYTHON_FUNCTORSIGNATURE_HPP
#define NEKTAR_LIBRARY_LIBUTILITIES_PYTHON_FUNCTORSIGNATURE_HPP
 
////////////////////////////////////////
// Functor registers with boost::python
////////////////////////////////////////
 
#include <boost/mpl/erase.hpp>
#include <boost/mpl/vector.hpp>
 
namespace boost::python::detail
{
template <class Functor> struct functor_signature;
 
template <class Functor>
typename std::enable_if<
    std::is_member_function_pointer<decltype(&Functor::operator())>::value,
    typename functor_signature<Functor>::type>::type
get_signature(Functor &, void * = nullptr)
{
    return typename functor_signature<Functor>::type();
}
} // namespace boost::python::detail
 
#include <boost/python/signature.hpp>
 
namespace boost::python::detail
{
template <class Functor> struct functor_signature
{
    typedef decltype(get_signature(
        &Functor::operator())) member_function_signature;
    typedef typename mpl::advance<
        typename mpl::begin<member_function_signature>::type,
        mpl::int_<1>>::type instance_argument_iterator;
    typedef typename mpl::erase<member_function_signature,
                                instance_argument_iterator>::type type;
};
} // namespace boost::python::detail
 
#endif