整理

include/boost/process/v2/start_dir.hpp

@@ -0,0 +1,51 @@
+//
+// process/start_dir.hpp
+// ~~~~~~~~
+//
+// Copyright (c) 2021 Klemens D. Morgenstern (klemens dot morgenstern at gmx dot net)
+//
+// 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_v2_START_DIR_HPP
+#define BOOST_PROCESS_v2_START_DIR_HPP
+
+#include <boost/process/v2/detail/config.hpp>
+#include <boost/process/v2/detail/last_error.hpp>
+#include <boost/process/v2/default_launcher.hpp>
+
+BOOST_PROCESS_V2_BEGIN_NAMESPACE
+
+/// Initializer for the starting directory of a subprocess to be launched.
+struct process_start_dir
+{
+  filesystem::path start_dir;
+
+  process_start_dir(filesystem::path start_dir) : start_dir(std::move(start_dir))
+  {
+  }
+
+#if defined(BOOST_PROCESS_V2_WINDOWS)
+  error_code on_setup(windows::default_launcher & launcher, 
+                      const filesystem::path &, const std::wstring &)
+  {
+    launcher.current_directory = start_dir;
+    return error_code {};
+  };
+
+#else
+  error_code on_exec_setup(posix::default_launcher & /*launcher*/,
+                           const filesystem::path &, const char * const *)
+  {
+    if (::chdir(start_dir.c_str()) == -1)
+      return detail::get_last_error();
+    else
+      return error_code ();
+  }
+#endif
+
+};
+
+BOOST_PROCESS_V2_END_NAMESPACE
+
+#endif //  BOOST_PROCESS_v2_START_DIR_HPP