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