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/*
Helper class used by variadic implementation of variadic boost::signals2::signal.
Author: Frank Mori Hess <fmhess@users.sourceforge.net>
Begin: 2009-05-27
*/
// Copyright Frank Mori Hess 2009
// Use, modification and
// distribution is subject to the Boost Software License, Version
// 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
// For more information, see http://www.boost.org
#ifndef BOOST_SIGNALS2_DETAIL_VARIADIC_SLOT_INVOKER_HPP
#define BOOST_SIGNALS2_DETAIL_VARIADIC_SLOT_INVOKER_HPP
#include <boost/signals2/detail/variadic_arg_type.hpp>
// if compiler has std::tuple use it instead of boost::tuple
// because boost::tuple does not have variadic template support at present.
#ifdef BOOST_NO_CXX11_HDR_TUPLE
#include <boost/tuple.hpp>
#define BOOST_SIGNALS2_TUPLE boost::tuple
#else
#include <tuple>
#define BOOST_SIGNALS2_TUPLE std::tuple
#endif
namespace boost
{
namespace signals2
{
namespace detail
{
template<unsigned ... values> class unsigned_meta_array {};
template<typename UnsignedMetaArray, unsigned n> class unsigned_meta_array_appender;
template<unsigned n, unsigned ... Args>
class unsigned_meta_array_appender<unsigned_meta_array<Args...>, n>
{
public:
typedef unsigned_meta_array<Args..., n> type;
};
template<unsigned n> class make_unsigned_meta_array;
template<> class make_unsigned_meta_array<0>
{
public:
typedef unsigned_meta_array<> type;
};
template<> class make_unsigned_meta_array<1>
{
public:
typedef unsigned_meta_array<0> type;
};
template<unsigned n> class make_unsigned_meta_array
{
public:
typedef typename unsigned_meta_array_appender<typename make_unsigned_meta_array<n-1>::type, n - 1>::type type;
};
template<typename R>
class call_with_tuple_args
{
public:
typedef R result_type;
template<typename Func, typename ... Args>
R operator()(Func &func, BOOST_SIGNALS2_TUPLE<Args...> args) const
{
typedef typename make_unsigned_meta_array<sizeof...(Args)>::type indices_type;
typename Func::result_type *resolver = 0;
return m_invoke(resolver, func, indices_type(), args);
}
private:
template<typename T, typename Func, unsigned ... indices, typename ... Args>
R m_invoke(T *, Func &func, unsigned_meta_array<indices...>, BOOST_SIGNALS2_TUPLE<Args...> args) const
{
return func(std::get<indices>(args)...);
}
template<typename Func, unsigned ... indices, typename ... Args>
R m_invoke(void *, Func &func, unsigned_meta_array<indices...>, BOOST_SIGNALS2_TUPLE<Args...> args) const
{
func(std::get<indices>(args)...);
return R();
}
};
template<typename R, typename ... Args>
class variadic_slot_invoker
{
public:
typedef R result_type;
variadic_slot_invoker(Args & ... args): _args(args...)
{}
template<typename ConnectionBodyType>
result_type operator ()(const ConnectionBodyType &connectionBody) const
{
result_type *resolver = 0;
return m_invoke(connectionBody,
resolver);
}
private:
template<typename ConnectionBodyType>
result_type m_invoke(const ConnectionBodyType &connectionBody,
const void_type *) const
{
return call_with_tuple_args<result_type>()(connectionBody->slot.slot_function(), _args);
return void_type();
}
template<typename ConnectionBodyType>
result_type m_invoke(const ConnectionBodyType &connectionBody, ...) const
{
return call_with_tuple_args<result_type>()(connectionBody->slot.slot_function(), _args);
}
BOOST_SIGNALS2_TUPLE<Args& ...> _args;
};
} // namespace detail
} // namespace signals2
} // namespace boost
#endif // BOOST_SIGNALS2_DETAIL_VARIADIC_SLOT_INVOKER_HPP
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