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diff --git a/boost/process/start_dir.hpp b/boost/process/start_dir.hpp
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+// 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
+//
+// 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)
+
+#ifndef BOOST_PROCESS_START_IN_DIR_HPP
+#define BOOST_PROCESS_START_IN_DIR_HPP
+
+#include <boost/process/detail/config.hpp>
+#include <boost/process/detail/handler.hpp>
+#include <boost/process/locale.hpp>
+
+#if defined (BOOST_POSIX_API)
+#include <boost/process/detail/posix/start_dir.hpp>
+#elif defined (BOOST_WINDOWS_API)
+#include <boost/process/detail/windows/start_dir.hpp>
+#endif
+
+#include <boost/process/detail/config.hpp>
+#include <string>
+#include <boost/filesystem/path.hpp>
+
+/** \file boost/process/start_dir.hpp
+ *
+Header which provides the start_dir property, which allows to set the directory
+the process shall be started in.
+\xmlonly
+<programlisting>
+namespace boost {
+  namespace process {
+    <emphasis>unspecified</emphasis> <globalname alt="boost::process::start_dir">start_dir</globalname>;
+  }
+}
+</programlisting>
+\endxmlonly
+
+ */
+
+namespace boost { namespace process { namespace detail {
+
+struct start_dir_
+{
+    constexpr start_dir_() {};
+
+    template<typename Char>
+    api::start_dir_init<Char> operator()(const std::basic_string<Char> & st) const {return {st}; }
+    template<typename Char>
+    api::start_dir_init<Char> operator()(std::basic_string<Char> && s) const {return {std::move(s)}; }
+    template<typename Char>
+    api::start_dir_init<Char> operator()(const Char* s)                const {return {s}; }
+    api::start_dir_init<typename boost::filesystem::path::value_type>
+                              operator()(const boost::filesystem::path & st) const {return {st.native()}; }
+
+    template<typename Char>
+    api::start_dir_init<Char> operator= (const std::basic_string<Char> & st) const {return {st}; }
+    template<typename Char>
+    api::start_dir_init<Char> operator= (std::basic_string<Char> && s) const {return {std::move(s)}; }
+    template<typename Char>
+    api::start_dir_init<Char> operator= (const Char* s)                const {return {s}; }
+    api::start_dir_init<typename boost::filesystem::path::value_type>
+                              operator= (const boost::filesystem::path & st) const {return {st.native()}; }
+
+};
+
+template<> struct is_wchar_t<api::start_dir_init<wchar_t>> : std::true_type {};
+
+template<>
+struct char_converter<char, api::start_dir_init<wchar_t>>
+{
+    static api::start_dir_init<char> conv(const api::start_dir_init<wchar_t> & in)
+    {
+        return api::start_dir_init<char>{::boost::process::detail::convert(in.str())};
+    }
+};
+
+template<>
+struct char_converter<wchar_t, api::start_dir_init<char>>
+{
+    static api::start_dir_init<wchar_t> conv(const api::start_dir_init<char> & in)
+    {
+        return api::start_dir_init<wchar_t>{::boost::process::detail::convert(in.str())};
+    }
+};
+
+}
+
+/**
+
+To set the start dir, the `start_dir` property is provided.
+
+The valid operations are the following:
+
+\code{.cpp}
+start_dir=path
+start_dir(path)
+\endcode
+
+It can be used with `std::string`, `std::wstring` and `boost::filesystem::path`.
+
+
+ */
+constexpr ::boost::process::detail::start_dir_ start_dir;
+
+}}
+
+#endif