// Copyright (c) 2006, 2007 Julio M. Merino Vidal
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// Copyright (c) 2008 Ilya Sokolov, Boris Schaeling
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// Copyright (c) 2009 Boris Schaeling
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// Copyright (c) 2010 Felipe Tanus, Boris Schaeling
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// Copyright (c) 2011, 2012 Jeff Flinn, Boris Schaeling
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// Copyright (c) 2016 Klemens D. Morgenstern
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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/**
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* \file boost/process/execute.hpp
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*
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* Defines a function to execute a program.
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*/
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#ifndef BOOST_PROCESS_EXECUTE_HPP
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#define BOOST_PROCESS_EXECUTE_HPP
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#include <boost/process/detail/config.hpp>
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#include <boost/process/detail/traits.hpp>
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#if defined(BOOST_POSIX_API)
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#include <boost/process/detail/posix/executor.hpp>
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#elif defined(BOOST_WINDOWS_API)
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#include <boost/process/detail/windows/executor.hpp>
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#endif
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#include <boost/process/detail/basic_cmd.hpp>
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#include <boost/process/detail/handler.hpp>
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#include <boost/fusion/view.hpp>
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#include <boost/fusion/container.hpp>
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#include <boost/fusion/sequence.hpp>
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#include <boost/fusion/tuple.hpp>
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#include <boost/fusion/algorithm/transformation/filter_if.hpp>
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#include <boost/fusion/adapted/std_tuple.hpp>
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#include <boost/fusion/container/vector/convert.hpp>
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#include <type_traits>
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#include <utility>
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namespace boost { namespace process {
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class child;
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namespace detail {
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template<typename ...Args>
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struct has_wchar;
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template<typename First, typename ...Args>
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struct has_wchar<First, Args...>
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{
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typedef has_wchar<Args...> next;
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typedef typename std::remove_cv<
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typename std::remove_reference<First>::type>::type res_type;
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constexpr static bool my_value = is_wchar_t<res_type>::value;
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constexpr static bool value = my_value || next::value;
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typedef std::integral_constant<bool, value> type;
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};
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template<typename First>
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struct has_wchar<First>
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{
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typedef typename std::remove_cv<
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typename std::remove_reference<First>::type>::type res_type;
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constexpr static bool value = is_wchar_t<res_type>::value;
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typedef std::integral_constant<bool, value> type;
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};
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#if defined(BOOST_WINDOWS_API)
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//everything needs to be wchar_t
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#if defined(BOOST_NO_ANSI_APIS)
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template<bool has_wchar>
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struct required_char_type
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{
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typedef wchar_t type;
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};
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#else
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template<bool has_wchar> struct required_char_type;
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template<> struct required_char_type<true>
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{
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typedef wchar_t type;
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};
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template<> struct required_char_type<false>
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{
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typedef char type;
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};
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#endif
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#elif defined(BOOST_POSIX_API)
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template<bool has_wchar>
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struct required_char_type
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{
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typedef char type;
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};
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#endif
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template<typename ... Args>
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using required_char_type_t = typename required_char_type<
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has_wchar<Args...>::value>::type;
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template<typename Iterator, typename End, typename ...Args>
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struct make_builders_from_view
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{
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typedef boost::fusion::set<Args...> set;
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typedef typename boost::fusion::result_of::deref<Iterator>::type ref_type;
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typedef typename std::remove_reference<ref_type>::type res_type;
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typedef typename initializer_tag<res_type>::type tag;
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typedef typename initializer_builder<tag>::type builder_type;
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typedef typename boost::fusion::result_of::has_key<set, builder_type> has_key;
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typedef typename boost::fusion::result_of::next<Iterator>::type next_itr;
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typedef typename make_builders_from_view<next_itr, End>::type next;
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typedef typename
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std::conditional<has_key::value,
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typename make_builders_from_view<next_itr, End, Args...>::type,
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typename make_builders_from_view<next_itr, End, Args..., builder_type>::type
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>::type type;
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};
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template<typename Iterator, typename ...Args>
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struct make_builders_from_view<Iterator, Iterator, Args...>
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{
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typedef boost::fusion::set<Args...> type;
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};
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template<typename Builders>
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struct builder_ref
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{
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Builders &builders;
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builder_ref(Builders & builders) : builders(builders) {};
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template<typename T>
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void operator()(T && value) const
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{
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typedef typename initializer_tag<typename std::remove_reference<T>::type>::type tag;
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typedef typename initializer_builder<tag>::type builder_type;
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boost::fusion::at_key<builder_type>(builders)(std::forward<T>(value));
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}
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};
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template<typename T>
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struct get_initializers_result
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{
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typedef typename T::result_type type;
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};
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template<>
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struct get_initializers_result<boost::fusion::void_>
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{
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typedef boost::fusion::void_ type;
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};
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template<typename ...Args>
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struct helper_vector
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{
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};
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template<typename T, typename ...Stack>
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struct invoke_get_initializer_collect_keys;
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template<typename ...Stack>
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struct invoke_get_initializer_collect_keys<boost::fusion::vector<>, Stack...>
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{
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typedef helper_vector<Stack...> type;
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};
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template<typename First, typename ...Args, typename ...Stack>
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struct invoke_get_initializer_collect_keys<boost::fusion::vector<First, Args...>, Stack...>
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{
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typedef typename invoke_get_initializer_collect_keys<boost::fusion::vector<Args...>, Stack..., First>::type next;
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typedef helper_vector<Stack...> stack_t;
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typedef typename std::conditional<std::is_same<boost::fusion::void_, First>::value,
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stack_t, next>::type type;
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};
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template<typename Keys>
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struct invoke_get_initializer;
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template<typename ...Args>
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struct invoke_get_initializer<helper_vector<Args...>>
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{
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typedef boost::fusion::tuple<typename get_initializers_result<Args>::type...> result_type;
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template<typename Sequence>
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static result_type call(Sequence & seq)
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{
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return result_type(boost::fusion::at_key<Args>(seq).get_initializer()...);;
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}
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};
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template<typename ...Args>
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inline boost::fusion::tuple<typename get_initializers_result<Args>::type...>
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get_initializers(boost::fusion::set<Args...> & builders)
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{
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//typedef boost::fusion::tuple<typename get_initializers_result<Args>::type...> return_type;
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typedef typename invoke_get_initializer_collect_keys<boost::fusion::vector<Args...>>::type keys;
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return invoke_get_initializer<keys>::call(builders);
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}
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template<typename Char, typename ... Args>
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inline child basic_execute_impl(Args && ... args)
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{
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//create a tuple from the argument list
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boost::fusion::tuple<typename std::remove_reference<Args>::type&...> tup(args...);
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auto inits = boost::fusion::filter_if<
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boost::process::detail::is_initializer<
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typename std::remove_reference<
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boost::mpl::_
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>::type
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>
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>(tup);
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auto others = boost::fusion::filter_if<
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boost::mpl::not_<
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boost::process::detail::is_initializer<
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typename std::remove_reference<
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boost::mpl::_
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>::type
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>
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>
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>(tup);
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// typename detail::make_builders_from_view<decltype(others)>::type builders;
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//typedef typename boost::fusion::result_of::as_vector<decltype(inits)>::type inits_t;
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typedef typename boost::fusion::result_of::as_vector<decltype(others)>::type others_t;
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// typedef decltype(others) others_t;
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typedef typename ::boost::process::detail::make_builders_from_view<
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typename boost::fusion::result_of::begin<others_t>::type,
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typename boost::fusion::result_of::end <others_t>::type>::type builder_t;
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builder_t builders;
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::boost::process::detail::builder_ref<builder_t> builder_ref(builders);
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boost::fusion::for_each(others, builder_ref);
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auto other_inits = ::boost::process::detail::get_initializers(builders);
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boost::fusion::joint_view<decltype(other_inits), decltype(inits)> complete_inits(other_inits, inits);
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auto exec = boost::process::detail::api::make_executor<Char>(complete_inits);
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return exec();
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}
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template<typename ...Args>
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inline child execute_impl(Args&& ... args)
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{
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typedef required_char_type_t<Args...> req_char_type;
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return basic_execute_impl<req_char_type>(
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boost::process::detail::char_converter_t<req_char_type, Args>::conv(
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std::forward<Args>(args))...
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);
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}
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}}}
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#endif
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