// 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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#ifndef BOOST_PROCESS_DETAIL_USED_HANDLES_HPP_
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#define BOOST_PROCESS_DETAIL_USED_HANDLES_HPP_
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#include <type_traits>
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#include <boost/fusion/include/filter_if.hpp>
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#include <boost/fusion/include/for_each.hpp>
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#if defined(BOOST_POSIX_API)
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#include <boost/process/detail/posix/handles.hpp>
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#include <boost/process/detail/posix/asio_fwd.hpp>
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#else
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#include <boost/process/detail/windows/handles.hpp>
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#include <boost/process/detail/windows/asio_fwd.hpp>
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#endif
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namespace boost { namespace process { namespace detail {
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struct uses_handles
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{
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//If you get an error here, you must add a `get_handles` function that returns a range or a single handle value
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void get_used_handles() const;
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};
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template<typename T>
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struct does_use_handle: std::is_base_of<uses_handles, T> {};
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template<typename T>
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struct does_use_handle<T&> : std::is_base_of<uses_handles, T> {};
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template<typename T>
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struct does_use_handle<const T&> : std::is_base_of<uses_handles, T> {};
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template<typename Char, typename Sequence>
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class executor;
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template<typename Func>
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struct foreach_handle_invocator
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{
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Func & func;
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foreach_handle_invocator(Func & func) : func(func) {}
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template<typename Range>
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void invoke(const Range & range) const
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{
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for (auto handle_ : range)
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func(handle_);
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}
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void invoke(::boost::process::detail::api::native_handle_type handle) const {func(handle);};
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template<typename T>
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void operator()(T & val) const {invoke(val.get_used_handles());}
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};
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template<typename Executor, typename Function>
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void foreach_used_handle(Executor &exec, Function &&func)
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{
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boost::fusion::for_each(boost::fusion::filter_if<does_use_handle<boost::mpl::_>>(exec.seq),
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foreach_handle_invocator<Function>(func));
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}
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template<typename Executor>
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std::vector<::boost::process::detail::api::native_handle_type>
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get_used_handles(Executor &exec)
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{
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std::vector<::boost::process::detail::api::native_handle_type> res;
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foreach_used_handle(exec, [&](::boost::process::detail::api::native_handle_type handle){res.push_back(handle);});
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return res;
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}
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}}}
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#endif /* BOOST_PROCESS_DETAIL_USED_HANDLES_HPP_ */
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