// Copyright (c) 2006, 2007 Julio M. Merino Vidal // Copyright (c) 2008 Ilya Sokolov, Boris Schaeling // Copyright (c) 2009 Boris Schaeling // Copyright (c) 2010 Felipe Tanus, Boris Schaeling // Copyright (c) 2011, 2012 Jeff Flinn, Boris Schaeling // Copyright (c) 2016 Klemens D. Morgenstern // // Distributed under 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) /** * \file boost/process/execute.hpp * * Defines a function to execute a program. */ #ifndef BOOST_PROCESS_EXECUTE_HPP #define BOOST_PROCESS_EXECUTE_HPP #include <boost/process/detail/config.hpp> #include <boost/process/detail/traits.hpp> #if defined(BOOST_POSIX_API) #include <boost/process/detail/posix/executor.hpp> #elif defined(BOOST_WINDOWS_API) #include <boost/process/detail/windows/executor.hpp> #endif #include <boost/process/detail/basic_cmd.hpp> #include <boost/process/detail/handler.hpp> #include <boost/fusion/view.hpp> #include <boost/fusion/container.hpp> #include <boost/fusion/sequence.hpp> #include <boost/fusion/tuple.hpp> #include <boost/fusion/algorithm/transformation/filter_if.hpp> #include <boost/fusion/adapted/std_tuple.hpp> #include <boost/fusion/container/vector/convert.hpp> #include <type_traits> #include <utility> namespace boost { namespace process { class child; namespace detail { template<typename ...Args> struct has_wchar; template<typename First, typename ...Args> struct has_wchar<First, Args...> { typedef has_wchar<Args...> next; typedef typename std::remove_cv< typename std::remove_reference<First>::type>::type res_type; constexpr static bool my_value = is_wchar_t<res_type>::value; constexpr static bool value = my_value || next::value; typedef std::integral_constant<bool, value> type; }; template<typename First> struct has_wchar<First> { typedef typename std::remove_cv< typename std::remove_reference<First>::type>::type res_type; constexpr static bool value = is_wchar_t<res_type>::value; typedef std::integral_constant<bool, value> type; }; #if defined(BOOST_WINDOWS_API) //everything needs to be wchar_t #if defined(BOOST_NO_ANSI_APIS) template<bool has_wchar> struct required_char_type { typedef wchar_t type; }; #else template<bool has_wchar> struct required_char_type; template<> struct required_char_type<true> { typedef wchar_t type; }; template<> struct required_char_type<false> { typedef char type; }; #endif #elif defined(BOOST_POSIX_API) template<bool has_wchar> struct required_char_type { typedef char type; }; #endif template<typename ... Args> using required_char_type_t = typename required_char_type< has_wchar<Args...>::value>::type; template<typename Iterator, typename End, typename ...Args> struct make_builders_from_view { typedef boost::fusion::set<Args...> set; typedef typename boost::fusion::result_of::deref<Iterator>::type ref_type; typedef typename std::remove_reference<ref_type>::type res_type; typedef typename initializer_tag<res_type>::type tag; typedef typename initializer_builder<tag>::type builder_type; typedef typename boost::fusion::result_of::has_key<set, builder_type> has_key; typedef typename boost::fusion::result_of::next<Iterator>::type next_itr; typedef typename make_builders_from_view<next_itr, End>::type next; typedef typename std::conditional<has_key::value, typename make_builders_from_view<next_itr, End, Args...>::type, typename make_builders_from_view<next_itr, End, Args..., builder_type>::type >::type type; }; template<typename Iterator, typename ...Args> struct make_builders_from_view<Iterator, Iterator, Args...> { typedef boost::fusion::set<Args...> type; }; template<typename Builders> struct builder_ref { Builders &builders; builder_ref(Builders & builders) : builders(builders) {}; template<typename T> void operator()(T && value) const { typedef typename initializer_tag<typename std::remove_reference<T>::type>::type tag; typedef typename initializer_builder<tag>::type builder_type; boost::fusion::at_key<builder_type>(builders)(std::forward<T>(value)); } }; template<typename T> struct get_initializers_result { typedef typename T::result_type type; }; template<> struct get_initializers_result<boost::fusion::void_> { typedef boost::fusion::void_ type; }; template<typename ...Args> struct helper_vector { }; template<typename T, typename ...Stack> struct invoke_get_initializer_collect_keys; template<typename ...Stack> struct invoke_get_initializer_collect_keys<boost::fusion::vector<>, Stack...> { typedef helper_vector<Stack...> type; }; template<typename First, typename ...Args, typename ...Stack> struct invoke_get_initializer_collect_keys<boost::fusion::vector<First, Args...>, Stack...> { typedef typename invoke_get_initializer_collect_keys<boost::fusion::vector<Args...>, Stack..., First>::type next; typedef helper_vector<Stack...> stack_t; typedef typename std::conditional<std::is_same<boost::fusion::void_, First>::value, stack_t, next>::type type; }; template<typename Keys> struct invoke_get_initializer; template<typename ...Args> struct invoke_get_initializer<helper_vector<Args...>> { typedef boost::fusion::tuple<typename get_initializers_result<Args>::type...> result_type; template<typename Sequence> static result_type call(Sequence & seq) { return result_type(boost::fusion::at_key<Args>(seq).get_initializer()...);; } }; template<typename ...Args> inline boost::fusion::tuple<typename get_initializers_result<Args>::type...> get_initializers(boost::fusion::set<Args...> & builders) { //typedef boost::fusion::tuple<typename get_initializers_result<Args>::type...> return_type; typedef typename invoke_get_initializer_collect_keys<boost::fusion::vector<Args...>>::type keys; return invoke_get_initializer<keys>::call(builders); } template<typename Char, typename ... Args> inline child basic_execute_impl(Args && ... args) { //create a tuple from the argument list boost::fusion::tuple<typename std::remove_reference<Args>::type&...> tup(args...); auto inits = boost::fusion::filter_if< boost::process::detail::is_initializer< typename std::remove_reference< boost::mpl::_ >::type > >(tup); auto others = boost::fusion::filter_if< boost::mpl::not_< boost::process::detail::is_initializer< typename std::remove_reference< boost::mpl::_ >::type > > >(tup); // typename detail::make_builders_from_view<decltype(others)>::type builders; //typedef typename boost::fusion::result_of::as_vector<decltype(inits)>::type inits_t; typedef typename boost::fusion::result_of::as_vector<decltype(others)>::type others_t; // typedef decltype(others) others_t; typedef typename ::boost::process::detail::make_builders_from_view< typename boost::fusion::result_of::begin<others_t>::type, typename boost::fusion::result_of::end <others_t>::type>::type builder_t; builder_t builders; ::boost::process::detail::builder_ref<builder_t> builder_ref(builders); boost::fusion::for_each(others, builder_ref); auto other_inits = ::boost::process::detail::get_initializers(builders); boost::fusion::joint_view<decltype(other_inits), decltype(inits)> complete_inits(other_inits, inits); auto exec = boost::process::detail::api::make_executor<Char>(complete_inits); return exec(); } template<typename ...Args> inline child execute_impl(Args&& ... args) { typedef required_char_type_t<Args...> req_char_type; return basic_execute_impl<req_char_type>( boost::process::detail::char_converter_t<req_char_type, Args>::conv( std::forward<Args>(args))... ); } }}} #endif