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13998547
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2012-12-21T23:33:15.387
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<p>Something I had worked on that does what you want I think -- it is however limited to functors that define at most one function call operator (lambdas fit this restriction). It also works on MSVC 2012 CTP.</p> <pre><code>namespace detail { //////////////////////////////////////////////////////////////////////////// //! Select between function pointer types //////////////////////////////////////////////////////////////////////////// template <typename T> struct callable_helper_ptr; //! non-member functions template <typename R, typename... Args> struct callable_helper_ptr<R (*)(Args...)> { typedef void object_t; typedef R result_t; typedef std::tuple<Args...> args_t; }; //! member functions template <typename R, typename O, typename... Args> struct callable_helper_ptr<R (O::*)(Args...)> { typedef O object_t; typedef R result_t; typedef std::tuple<Args...> args_t; }; //! const member functions template <typename R, typename O, typename... Args> struct callable_helper_ptr<R (O::*)(Args...) const> { typedef O object_t; typedef R result_t; typedef std::tuple<Args...> args_t; }; //////////////////////////////////////////////////////////////////////////// //! Select between function pointers and functors //////////////////////////////////////////////////////////////////////////// template <typename T, typename is_ptr = typename std::is_pointer<T>::type> struct callable_helper; //! specialization for functors (and lambdas) template <typename T> struct callable_helper<T, std::false_type> { typedef callable_helper_ptr<decltype(&T::operator())> type; }; //! specialization for function pointers template <typename T> struct callable_helper<T, std::true_type> { typedef callable_helper_ptr<T> type; }; } //namespace detail //////////////////////////////////////////////////////////////////////////////// //! defines the various details of a callable object T //////////////////////////////////////////////////////////////////////////////// template <typename T> struct callable_traits { typedef typename detail::callable_helper<T>::type::object_t object_t; typedef typename detail::callable_helper<T>::type::result_t result_t; typedef typename detail::callable_helper<T>::type::args_t args_t; template <unsigned N> struct arg : public std::tuple_element<N, args_t> {}; }; </code></pre> <p>And my write up on the process behind writing if anyone is interested: <a href="http://bkentel.wordpress.com/2012/12/12/defining-a-traits-type-for-callable-objects/" rel="nofollow">http://bkentel.wordpress.com/2012/12/12/defining-a-traits-type-for-callable-objects/</a></p>
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1. PODetermining number and type of parameters and return type of type parameter that is a function
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