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551 lines
20 KiB
C++
Executable file
551 lines
20 KiB
C++
Executable file
// 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_IO_HPP_
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#define BOOST_PROCESS_IO_HPP_
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#include <iosfwd>
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#include <cstdio>
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#include <functional>
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#include <utility>
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#include <boost/process/detail/config.hpp>
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#include <boost/process/pipe.hpp>
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#include <future>
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#if defined(BOOST_POSIX_API)
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#include <boost/process/detail/posix/asio_fwd.hpp>
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#include <boost/process/detail/posix/close_in.hpp>
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#include <boost/process/detail/posix/close_out.hpp>
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#include <boost/process/detail/posix/null_in.hpp>
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#include <boost/process/detail/posix/null_out.hpp>
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#include <boost/process/detail/posix/file_in.hpp>
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#include <boost/process/detail/posix/file_out.hpp>
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#include <boost/process/detail/posix/pipe_in.hpp>
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#include <boost/process/detail/posix/pipe_out.hpp>
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#elif defined(BOOST_WINDOWS_API)
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#include <boost/process/detail/windows/asio_fwd.hpp>
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#include <boost/process/detail/windows/close_in.hpp>
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#include <boost/process/detail/windows/close_out.hpp>
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#include <boost/process/detail/windows/null_in.hpp>
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#include <boost/process/detail/windows/null_out.hpp>
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#include <boost/process/detail/windows/file_in.hpp>
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#include <boost/process/detail/windows/file_out.hpp>
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#include <boost/process/detail/windows/pipe_in.hpp>
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#include <boost/process/detail/windows/pipe_out.hpp>
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#endif
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/** \file boost/process/io.hpp
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*
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* Header which provides the io properties. It provides the following properties:
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*
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\xmlonly
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<programlisting>
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namespace boost {
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namespace process {
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<emphasis>unspecified</emphasis> <globalname alt="boost::process::close">close</globalname>;
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<emphasis>unspecified</emphasis> <globalname alt="boost::process::null">null</globalname>;
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<emphasis>unspecified</emphasis> <globalname alt="boost::process::std_in">std_in</globalname>;
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<emphasis>unspecified</emphasis> <globalname alt="boost::process::std_out">std_out</globalname>;
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<emphasis>unspecified</emphasis> <globalname alt="boost::process::std_err">std_err</globalname>;
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}
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}
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</programlisting>
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\endxmlonly
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\par File I/O
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The library allows full redirection of streams to files as shown below.
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\code{.cpp}
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boost::filesystem::path log = "my_log_file.txt";
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boost::filesystem::path input = "input.txt";
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boost::filesystem::path output = "output.txt";
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system("my_prog", std_out>output, std_in<input, std_err>log);
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\endcode
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\par Synchronous Pipe I/O
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Another way is to communicate through pipes.
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\code{.cpp}
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pstream str;
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child c("my_prog", std_out > str);
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int i;
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str >> i;
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\endcode
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Note that the pipe may also be used between several processes, like this:
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\code{.cpp}
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pipe p;
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child c1("nm", "a.out", std_out>p);
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child c2("c++filt", std_in<p);
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\endcode
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\par Asynchronous I/O
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Utilizing `boost.asio` asynchronous I/O is provided.
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\code
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boost::asio::io_context ios;
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std::future<std::string> output;
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system("ls", std_out > output, ios);
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auto res = fut.get();
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\endcode
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\note `boost/process/async.hpp` must also be included for this to work.
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\par Closing
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Stream can be closed, so nothing can be read or written.
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\code{.cpp}
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system("foo", std_in.close());
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\endcode
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\par Null
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Streams can be redirected to null, which means, that written date will be
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discarded and read data will only contain `EOF`.
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\code{.cpp}
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system("b2", std_out > null);
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\endcode
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*
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*/
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namespace boost { namespace process { namespace detail {
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template<typename T> using is_streambuf = typename std::is_same<T, boost::asio::streambuf>::type;
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template<typename T> using is_const_buffer =
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std::integral_constant<bool,
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std::is_same< boost::asio::const_buffer, T>::value |
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std::is_base_of<boost::asio::const_buffer, T>::value
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>;
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template<typename T> using is_mutable_buffer =
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std::integral_constant<bool,
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std::is_same< boost::asio::mutable_buffer, T>::value |
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std::is_base_of<boost::asio::mutable_buffer, T>::value
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>;
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struct null_t {constexpr null_t() = default;};
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struct close_t;
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template<class>
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struct std_in_
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{
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constexpr std_in_() = default;
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api::close_in close() const {return api::close_in(); }
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api::close_in operator=(const close_t &) const {return api::close_in();}
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api::close_in operator<(const close_t &) const {return api::close_in();}
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api::null_in null() const {return api::null_in();}
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api::null_in operator=(const null_t &) const {return api::null_in();}
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api::null_in operator<(const null_t &) const {return api::null_in();}
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api::file_in operator=(const boost::filesystem::path &p) const {return p;}
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api::file_in operator=(const std::string & p) const {return p;}
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api::file_in operator=(const std::wstring &p) const {return p;}
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api::file_in operator=(const char * p) const {return p;}
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api::file_in operator=(const wchar_t * p) const {return p;}
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api::file_in operator<(const boost::filesystem::path &p) const {return p;}
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api::file_in operator<(const std::string &p) const {return p;}
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api::file_in operator<(const std::wstring &p) const {return p;}
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api::file_in operator<(const char*p) const {return p;}
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api::file_in operator<(const wchar_t * p) const {return p;}
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api::file_in operator=(FILE * f) const {return f;}
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api::file_in operator<(FILE * f) const {return f;}
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template<typename Char, typename Traits> api::pipe_in operator=(basic_pipe<Char, Traits> & p) const {return p;}
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template<typename Char, typename Traits> api::pipe_in operator<(basic_pipe<Char, Traits> & p) const {return p;}
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template<typename Char, typename Traits> api::pipe_in operator=(basic_opstream<Char, Traits> & p) const {return p.pipe();}
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template<typename Char, typename Traits> api::pipe_in operator<(basic_opstream<Char, Traits> & p) const {return p.pipe();}
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template<typename Char, typename Traits> api::pipe_in operator=(basic_pstream <Char, Traits> & p) const {return p.pipe();}
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template<typename Char, typename Traits> api::pipe_in operator<(basic_pstream <Char, Traits> & p) const {return p.pipe();}
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api::async_pipe_in operator=(async_pipe & p) const {return p;}
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api::async_pipe_in operator<(async_pipe & p) const {return p;}
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template<typename T, typename = typename std::enable_if<
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is_const_buffer<T>::value || is_mutable_buffer<T>::value
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>::type>
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api::async_in_buffer<const T> operator=(const T & buf) const {return buf;}
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template<typename T, typename = typename std::enable_if<is_streambuf<T>::value>::type >
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api::async_in_buffer<T> operator=(T & buf) const {return buf;}
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template<typename T, typename = typename std::enable_if<
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is_const_buffer<T>::value || is_mutable_buffer<T>::value
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>::type>
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api::async_in_buffer<const T> operator<(const T & buf) const {return buf;}
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template<typename T, typename = typename std::enable_if<is_streambuf<T>::value>::type >
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api::async_in_buffer<T> operator<(T & buf) const {return buf;}
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};
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//-1 == empty.
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//1 == stdout
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//2 == stderr
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template<int p1, int p2 = -1>
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struct std_out_
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{
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constexpr std_out_() = default;
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api::close_out<p1,p2> close() const {return api::close_out<p1,p2>(); }
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api::close_out<p1,p2> operator=(const close_t &) const {return api::close_out<p1,p2>();}
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api::close_out<p1,p2> operator>(const close_t &) const {return api::close_out<p1,p2>();}
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api::null_out<p1,p2> null() const {return api::null_out<p1,p2>();}
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api::null_out<p1,p2> operator=(const null_t &) const {return api::null_out<p1,p2>();}
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api::null_out<p1,p2> operator>(const null_t &) const {return api::null_out<p1,p2>();}
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api::file_out<p1,p2> operator=(const boost::filesystem::path &p) const {return api::file_out<p1,p2>(p);}
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api::file_out<p1,p2> operator=(const std::string &p) const {return api::file_out<p1,p2>(p);}
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api::file_out<p1,p2> operator=(const std::wstring &p) const {return api::file_out<p1,p2>(p);}
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api::file_out<p1,p2> operator=(const char * p) const {return api::file_out<p1,p2>(p);}
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api::file_out<p1,p2> operator=(const wchar_t * p) const {return api::file_out<p1,p2>(p);}
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api::file_out<p1,p2> operator>(const boost::filesystem::path &p) const {return api::file_out<p1,p2>(p);}
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api::file_out<p1,p2> operator>(const std::string &p) const {return api::file_out<p1,p2>(p);}
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api::file_out<p1,p2> operator>(const std::wstring &p) const {return api::file_out<p1,p2>(p);}
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api::file_out<p1,p2> operator>(const char * p) const {return api::file_out<p1,p2>(p);}
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api::file_out<p1,p2> operator>(const wchar_t * p) const {return api::file_out<p1,p2>(p);}
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api::file_out<p1,p2> operator=(FILE * f) const {return f;}
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api::file_out<p1,p2> operator>(FILE * f) const {return f;}
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template<typename Char, typename Traits> api::pipe_out<p1,p2> operator=(basic_pipe<Char, Traits> & p) const {return p;}
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template<typename Char, typename Traits> api::pipe_out<p1,p2> operator>(basic_pipe<Char, Traits> & p) const {return p;}
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template<typename Char, typename Traits> api::pipe_out<p1,p2> operator=(basic_ipstream<Char, Traits> & p) const {return p.pipe();}
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template<typename Char, typename Traits> api::pipe_out<p1,p2> operator>(basic_ipstream<Char, Traits> & p) const {return p.pipe();}
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template<typename Char, typename Traits> api::pipe_out<p1,p2> operator=(basic_pstream <Char, Traits> & p) const {return p.pipe();}
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template<typename Char, typename Traits> api::pipe_out<p1,p2> operator>(basic_pstream <Char, Traits> & p) const {return p.pipe();}
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api::async_pipe_out<p1, p2> operator=(async_pipe & p) const {return p;}
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api::async_pipe_out<p1, p2> operator>(async_pipe & p) const {return p;}
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api::async_out_buffer<p1, p2, const asio::mutable_buffer> operator=(const asio::mutable_buffer & buf) const {return buf;}
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api::async_out_buffer<p1, p2, const asio::mutable_buffers_1> operator=(const asio::mutable_buffers_1 & buf) const {return buf;}
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api::async_out_buffer<p1, p2, asio::streambuf> operator=(asio::streambuf & os) const {return os ;}
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api::async_out_buffer<p1, p2, const asio::mutable_buffer> operator>(const asio::mutable_buffer & buf) const {return buf;}
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api::async_out_buffer<p1, p2, const asio::mutable_buffers_1> operator>(const asio::mutable_buffers_1 & buf) const {return buf;}
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api::async_out_buffer<p1, p2, asio::streambuf> operator>(asio::streambuf & os) const {return os ;}
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api::async_out_future<p1,p2, std::string> operator=(std::future<std::string> & fut) const { return fut;}
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api::async_out_future<p1,p2, std::string> operator>(std::future<std::string> & fut) const { return fut;}
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api::async_out_future<p1,p2, std::vector<char>> operator=(std::future<std::vector<char>> & fut) const { return fut;}
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api::async_out_future<p1,p2, std::vector<char>> operator>(std::future<std::vector<char>> & fut) const { return fut;}
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template<int pin, typename = typename std::enable_if<
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(((p1 == 1) && (pin == 2)) ||
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((p1 == 2) && (pin == 1)))
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&& (p2 == -1)>::type>
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constexpr std_out_<1, 2> operator& (const std_out_<pin>&) const
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{
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return std_out_<1, 2> ();
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}
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};
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struct close_t
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{
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constexpr close_t() = default;
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template<int T, int U>
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api::close_out<T,U> operator()(std_out_<T,U>) {return api::close_out<T,U>();}
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};
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}
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///This constant is a utility to allow syntax like `std_out > close` for closing I/O streams.
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constexpr boost::process::detail::close_t close;
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///This constant is a utility to redirect streams to the null-device.
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constexpr boost::process::detail::null_t null;
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/**
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This property allows to set the input stream for the child process.
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\section stdin_details Details
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\subsection stdin_file File Input
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The file I/O simple redirects the stream to a file, for which the possible types are
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- `boost::filesystem::path`
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- `std::basic_string<char_type>`
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- `const char_type*`
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- `FILE*`
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with `char_type` being either `char` or `wchar_t`.
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FILE* is explicitly added, so the process can easily redirect the output stream
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of the child to another output stream of the process. That is:
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\code{.cpp}
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system("ls", std_in < stdin);
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\endcode
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\warning If the launching and the child process use the input, this leads to undefined behaviour.
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A syntax like `system("ls", std_out > std::cerr)` is not possible, due to the C++
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implementation not providing access to the handle.
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The valid expressions for this property are
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\code{.cpp}
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std_in < file;
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std_in = file;
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\endcode
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\subsection stdin_pipe Pipe Input
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As explained in the corresponding section, the boost.process library provides a
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@ref boost::process::async_pipe "async_pipe" class which can be
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used to communicate with child processes.
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\note Technically the @ref boost::process::async_pipe "async_pipe"
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works synchronous here, since no asio implementation is used by the library here.
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The async-operation will then however not end if the process is finished, since
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the pipe remains open. You can use the async_close function with on_exit to fix that.
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Valid expressions with pipes are these:
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\code{.cpp}
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std_in < pipe;
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std_in = pipe;
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\endcode
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Where the valid types for `pipe` are the following:
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- `basic_pipe`
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- `async_pipe`
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- `basic_opstream`
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- `basic_pstream`
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Note that the pipe may also be used between several processes, like this:
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\code{.cpp}
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pipe p;
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child c1("nm", "a.out", std_out>p);
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child c2("c++filt", std_in<p);
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\endcode
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\subsection stdin_async_pipe Asynchronous Pipe Input
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Asynchronous Pipe I/O classifies communication which has automatically handling
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of the asynchronous operations by the process library. This means, that a pipe will be
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constructed, the async_read/-write will be automatically started, and that the
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end of the child process will also close the pipe.
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Valid types for pipe I/O are the following:
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- `boost::asio::const_buffer` \xmlonly <footnote><para> Constructed with <code>boost::asio::buffer</code></para></footnote> \endxmlonly
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- `boost::asio::mutable_buffer` \xmlonly <footnote><para> Constructed with <code>boost::asio::buffer</code></para></footnote> \endxmlonly
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- `boost::asio::streambuf`
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Valid expressions with pipes are these:
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\code{.cpp}
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std_in < buffer;
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std_in = buffer;
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std_out > buffer;
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std_out = buffer;
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std_err > buffer;
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std_err = buffer;
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(std_out & std_err) > buffer;
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(std_out & std_err) = buffer;
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\endcode
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\note It is also possible to get a future for std_in, by chaining another `std::future<void>` onto it,
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so you can wait for the input to be completed. It looks like this:
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\code{.cpp}
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std::future<void> fut;
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boost::asio::io_context ios;
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std::string data;
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child c("prog", std_in < buffer(data) > fut, ios);
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fut.get();
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\endcode
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\note `boost::asio::buffer` is also available in the `boost::process` namespace.
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\warning This feature requires `boost/process/async.hpp` to be included and a reference to `boost::asio::io_context` to be passed to the launching function.
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\subsection stdin_close Close
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The input stream can be closed, so it cannot be read from. This will lead to an error when attempted.
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This can be achieved by the following syntax.
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\code{.cpp}
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std_in < close;
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std_in = close;
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std_in.close();
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\endcode
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\subsection stdin_null Null
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The input stream can be redirected to read from the null-device, which means that only `EOF` is read.
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The syntax to achieve that has the following variants:
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\code{.cpp}
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std_in < null;
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std_in = null;
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std_in.null();
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\endcode
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*/
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constexpr boost::process::detail::std_in_<void> std_in;
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/**
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This property allows to set the output stream for the child process.
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\note The Semantic is the same as for \xmlonly <globalname alt="boost::process::std_err">std_err</globalname> \endxmlonly
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\note `std_err` and `std_out` can be combined into one stream, with the `operator &`, i.e. `std_out & std_err`.
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\section stdout_details Details
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\subsection stdout_file File Input
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The file I/O simple redirects the stream to a file, for which the possible types are
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- `boost::filesystem::path`
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- `std::basic_string<char_type>`
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- `const char_type*`
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- `FILE*`
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|
|
|
with `char_type` being either `char` or `wchar_t`.
|
|
|
|
FILE* is explicitly added, so the process can easily redirect the output stream
|
|
of the child to another output stream of the process. That is:
|
|
|
|
\code{.cpp}
|
|
system("ls", std_out < stdin);
|
|
\endcode
|
|
|
|
\warning If the launching and the child process use the input, this leads to undefined behaviour.
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|
|
|
A syntax like `system("ls", std_out > std::cerr)` is not possible, due to the C++
|
|
implementation not providing access to the handle.
|
|
|
|
The valid expressions for this property are
|
|
|
|
\code{.cpp}
|
|
std_out < file;
|
|
std_out = file;
|
|
\endcode
|
|
|
|
\subsection stdout_pipe Pipe Output
|
|
|
|
As explained in the corresponding section, the boost.process library provides a
|
|
@ref boost::process::async_pipe "async_pipe" class which can be
|
|
used to communicate with child processes.
|
|
|
|
\note Technically the @ref boost::process::async_pipe "async_pipe"
|
|
works like a synchronous pipe here, since no asio implementation is used by the library here.
|
|
The asynchronous operation will then however not end if the process is finished, since
|
|
the pipe remains open. You can use the async_close function with on_exit to fix that.
|
|
|
|
Valid expressions with pipes are these:
|
|
|
|
\code{.cpp}
|
|
std_out > pipe;
|
|
std_out = pipe;
|
|
\endcode
|
|
|
|
Where the valid types for `pipe` are the following:
|
|
|
|
- `basic_pipe`
|
|
- `async_pipe`
|
|
- `basic_ipstream`
|
|
- `basic_pstream`
|
|
|
|
Note that the pipe may also be used between several processes, like this:
|
|
|
|
\code{.cpp}
|
|
pipe p;
|
|
child c1("nm", "a.out", std_out>p);
|
|
child c2("c++filt", std_in<p);
|
|
\endcode
|
|
|
|
\subsection stdout_async_pipe Asynchronous Pipe Output
|
|
|
|
Asynchronous Pipe I/O classifies communication which has automatically handling
|
|
of the async operations by the process library. This means, that a pipe will be
|
|
constructed, the async_read/-write will be automatically started, and that the
|
|
end of the child process will also close the pipe.
|
|
|
|
Valid types for pipe I/O are the following:
|
|
|
|
- `boost::asio::mutable_buffer` \xmlonly <footnote><para> Constructed with <code>boost::asio::buffer</code></para></footnote> \endxmlonly
|
|
- `boost::asio::streambuf`
|
|
- `std::future<std::vector<char>>`
|
|
- `std::future<std::string>`
|
|
|
|
Valid expressions with pipes are these:
|
|
|
|
\code{.cpp}
|
|
std_out > buffer;
|
|
std_out = buffer;
|
|
std_err > buffer;
|
|
std_err = buffer;
|
|
(std_out & std_err) > buffer;
|
|
(std_out & std_err) = buffer;
|
|
\endcode
|
|
|
|
\note `boost::asio::buffer` is also available in the `boost::process` namespace.
|
|
|
|
\warning This feature requires `boost/process/async.hpp` to be included and a reference to `boost::asio::io_context` to be passed to the launching function.
|
|
|
|
|
|
\subsection stdout_close Close
|
|
|
|
The out stream can be closed, so it cannot be write from.
|
|
This will lead to an error when attempted.
|
|
|
|
This can be achieved by the following syntax.
|
|
|
|
\code{.cpp}
|
|
std_out > close;
|
|
std_out = close;
|
|
std_out.close();
|
|
\endcode
|
|
|
|
\subsection stdout_null Null
|
|
|
|
The output stream can be redirected to write to the null-device,
|
|
which means that all output is discarded.
|
|
|
|
The syntax to achieve that has the following variants:
|
|
|
|
\code{.cpp}
|
|
std_out > null;
|
|
std_out = null;
|
|
std_out.null();
|
|
\endcode
|
|
|
|
*/
|
|
|
|
constexpr boost::process::detail::std_out_<1> std_out;
|
|
/**This property allows setting the `stderr` stream. The semantic and syntax is the same as for
|
|
* \xmlonly <globalname alt="boost::process::std_out">std_out</globalname> \endxmlonly .
|
|
*/
|
|
constexpr boost::process::detail::std_out_<2> std_err;
|
|
|
|
}}
|
|
#endif /* INCLUDE_BOOST_PROCESS_IO_HPP_ */
|