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 //
 // basic_file.hpp
 // ~~~~~~~~~~~~~~
 //
 // Copyright (c) 2003-2023 Christopher M. Kohlhoff (chris at kohlhoff dot com)
 //
 // 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_ASIO_BASIC_FILE_HPP
 #define BOOST_ASIO_BASIC_FILE_HPP
 
 #if defined(_MSC_VER) && (_MSC_VER >= 1200)
 # pragma once
 #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
 
 #include <boost/asio/detail/config.hpp>
 
 #if defined(BOOST_ASIO_HAS_FILE) \
   || defined(GENERATING_DOCUMENTATION)
 
 #include <string>
 #include <utility>
 #include <boost/asio/any_io_executor.hpp>
 #include <boost/asio/async_result.hpp>
 #include <boost/asio/detail/cstdint.hpp>
 #include <boost/asio/detail/handler_type_requirements.hpp>
 #include <boost/asio/detail/io_object_impl.hpp>
 #include <boost/asio/detail/non_const_lvalue.hpp>
 #include <boost/asio/detail/throw_error.hpp>
 #include <boost/asio/detail/type_traits.hpp>
 #include <boost/asio/error.hpp>
 #include <boost/asio/execution_context.hpp>
 #include <boost/asio/post.hpp>
 #include <boost/asio/file_base.hpp>
 #if defined(BOOST_ASIO_HAS_IOCP)
 # include <boost/asio/detail/win_iocp_file_service.hpp>
 #elif defined(BOOST_ASIO_HAS_IO_URING)
 # include <boost/asio/detail/io_uring_file_service.hpp>
 #endif
 
 #include <boost/asio/detail/push_options.hpp>
 
 namespace boost {
 namespace asio {
 
 #if !defined(BOOST_ASIO_BASIC_FILE_FWD_DECL)
 #define BOOST_ASIO_BASIC_FILE_FWD_DECL
 
 // Forward declaration with defaulted arguments.
 template <typename Executor = any_io_executor>
 class basic_file;
 
 #endif // !defined(BOOST_ASIO_BASIC_FILE_FWD_DECL)
 
 /// Provides file functionality.
 /**
  * The basic_file class template provides functionality that is common to both
  * stream-oriented and random-access files.
  *
  * @par Thread Safety
  * @e Distinct @e objects: Safe.@n
  * @e Shared @e objects: Unsafe.
  */
 template <typename Executor>
 class basic_file
   : public file_base
 {
 public:
   /// The type of the executor associated with the object.
   typedef Executor executor_type;
 
   /// Rebinds the file type to another executor.
   template <typename Executor1>
   struct rebind_executor
   {
     /// The file type when rebound to the specified executor.
     typedef basic_file<Executor1> other;
   };
 
   /// The native representation of a file.
 #if defined(GENERATING_DOCUMENTATION)
   typedef implementation_defined native_handle_type;
 #elif defined(BOOST_ASIO_HAS_IOCP)
   typedef detail::win_iocp_file_service::native_handle_type native_handle_type;
 #elif defined(BOOST_ASIO_HAS_IO_URING)
   typedef detail::io_uring_file_service::native_handle_type native_handle_type;
 #endif
 
   /// Construct a basic_file without opening it.
   /**
    * This constructor initialises a file without opening it.
    *
    * @param ex The I/O executor that the file will use, by default, to
    * dispatch handlers for any asynchronous operations performed on the file.
    */
   explicit basic_file(const executor_type& ex)
     : impl_(0, ex)
   {
   }
 
   /// Construct a basic_file without opening it.
   /**
    * This constructor initialises a file without opening it.
    *
    * @param context An execution context which provides the I/O executor that
    * the file will use, by default, to dispatch handlers for any asynchronous
    * operations performed on the file.
    */
   template <typename ExecutionContext>
   explicit basic_file(ExecutionContext& context,
       constraint_t<
         is_convertible<ExecutionContext&, execution_context&>::value,
         defaulted_constraint
       > = defaulted_constraint())
     : impl_(0, 0, context)
   {
   }
 
   /// Construct and open a basic_file.
   /**
    * This constructor initialises a file and opens it.
    *
    * @param ex The I/O executor that the file will use, by default, to
    * dispatch handlers for any asynchronous operations performed on the file.
    *
    * @param path The path name identifying the file to be opened.
    *
    * @param open_flags A set of flags that determine how the file should be
    * opened.
    */
   explicit basic_file(const executor_type& ex,
       const char* path, file_base::flags open_flags)
     : impl_(0, ex)
   {
     boost::system::error_code ec;
     impl_.get_service().open(impl_.get_implementation(), path, open_flags, ec);
     boost::asio::detail::throw_error(ec, "open");
   }
 
   /// Construct a basic_file without opening it.
   /**
    * This constructor initialises a file and opens it.
    *
    * @param context An execution context which provides the I/O executor that
    * the file will use, by default, to dispatch handlers for any asynchronous
    * operations performed on the file.
    *
    * @param path The path name identifying the file to be opened.
    *
    * @param open_flags A set of flags that determine how the file should be
    * opened.
    */
   template <typename ExecutionContext>
   explicit basic_file(ExecutionContext& context,
       const char* path, file_base::flags open_flags,
       constraint_t<
         is_convertible<ExecutionContext&, execution_context&>::value,
         defaulted_constraint
       > = defaulted_constraint())
     : impl_(0, 0, context)
   {
     boost::system::error_code ec;
     impl_.get_service().open(impl_.get_implementation(), path, open_flags, ec);
     boost::asio::detail::throw_error(ec, "open");
   }
 
   /// Construct and open a basic_file.
   /**
    * This constructor initialises a file and opens it.
    *
    * @param ex The I/O executor that the file will use, by default, to
    * dispatch handlers for any asynchronous operations performed on the file.
    *
    * @param path The path name identifying the file to be opened.
    *
    * @param open_flags A set of flags that determine how the file should be
    * opened.
    */
   explicit basic_file(const executor_type& ex,
       const std::string& path, file_base::flags open_flags)
     : impl_(0, ex)
   {
     boost::system::error_code ec;
     impl_.get_service().open(impl_.get_implementation(),
         path.c_str(), open_flags, ec);
     boost::asio::detail::throw_error(ec, "open");
   }
 
   /// Construct a basic_file without opening it.
   /**
    * This constructor initialises a file and opens it.
    *
    * @param context An execution context which provides the I/O executor that
    * the file will use, by default, to dispatch handlers for any asynchronous
    * operations performed on the file.
    *
    * @param path The path name identifying the file to be opened.
    *
    * @param open_flags A set of flags that determine how the file should be
    * opened.
    */
   template <typename ExecutionContext>
   explicit basic_file(ExecutionContext& context,
       const std::string& path, file_base::flags open_flags,
       constraint_t<
         is_convertible<ExecutionContext&, execution_context&>::value,
         defaulted_constraint
       > = defaulted_constraint())
     : impl_(0, 0, context)
   {
     boost::system::error_code ec;
     impl_.get_service().open(impl_.get_implementation(),
         path.c_str(), open_flags, ec);
     boost::asio::detail::throw_error(ec, "open");
   }
 
   /// Construct a basic_file on an existing native file handle.
   /**
    * This constructor initialises a file object to hold an existing native file.
    *
    * @param ex The I/O executor that the file will use, by default, to
    * dispatch handlers for any asynchronous operations performed on the file.
    *
    * @param native_file A native file handle.
    *
    * @throws boost::system::system_error Thrown on failure.
    */
   basic_file(const executor_type& ex, const native_handle_type& native_file)
     : impl_(0, ex)
   {
     boost::system::error_code ec;
     impl_.get_service().assign(
         impl_.get_implementation(), native_file, ec);
     boost::asio::detail::throw_error(ec, "assign");
   }
 
   /// Construct a basic_file on an existing native file.
   /**
    * This constructor initialises a file object to hold an existing native file.
    *
    * @param context An execution context which provides the I/O executor that
    * the file will use, by default, to dispatch handlers for any asynchronous
    * operations performed on the file.
    *
    * @param native_file A native file.
    *
    * @throws boost::system::system_error Thrown on failure.
    */
   template <typename ExecutionContext>
   basic_file(ExecutionContext& context, const native_handle_type& native_file,
       constraint_t<
         is_convertible<ExecutionContext&, execution_context&>::value,
         defaulted_constraint
       > = defaulted_constraint())
     : impl_(0, 0, context)
   {
     boost::system::error_code ec;
     impl_.get_service().assign(
         impl_.get_implementation(), native_file, ec);
     boost::asio::detail::throw_error(ec, "assign");
   }
 
   /// Move-construct a basic_file from another.
   /**
    * This constructor moves a file from one object to another.
    *
    * @param other The other basic_file object from which the move will
    * occur.
    *
    * @note Following the move, the moved-from object is in the same state as if
    * constructed using the @c basic_file(const executor_type&) constructor.
    */
   basic_file(basic_file&& other) noexcept
     : impl_(std::move(other.impl_))
   {
   }
 
   /// Move-assign a basic_file from another.
   /**
    * This assignment operator moves a file from one object to another.
    *
    * @param other The other basic_file object from which the move will
    * occur.
    *
    * @note Following the move, the moved-from object is in the same state as if
    * constructed using the @c basic_file(const executor_type&) constructor.
    */
   basic_file& operator=(basic_file&& other)
   {
     impl_ = std::move(other.impl_);
     return *this;
   }
 
   // All files have access to each other's implementations.
   template <typename Executor1>
   friend class basic_file;
 
   /// Move-construct a basic_file from a file of another executor type.
   /**
    * This constructor moves a file from one object to another.
    *
    * @param other The other basic_file object from which the move will
    * occur.
    *
    * @note Following the move, the moved-from object is in the same state as if
    * constructed using the @c basic_file(const executor_type&) constructor.
    */
   template <typename Executor1>
   basic_file(basic_file<Executor1>&& other,
       constraint_t<
         is_convertible<Executor1, Executor>::value,
         defaulted_constraint
       > = defaulted_constraint())
     : impl_(std::move(other.impl_))
   {
   }
 
   /// Move-assign a basic_file from a file of another executor type.
   /**
    * This assignment operator moves a file from one object to another.
    *
    * @param other The other basic_file object from which the move will
    * occur.
    *
    * @note Following the move, the moved-from object is in the same state as if
    * constructed using the @c basic_file(const executor_type&) constructor.
    */
   template <typename Executor1>
   constraint_t<
     is_convertible<Executor1, Executor>::value,
     basic_file&
   > operator=(basic_file<Executor1>&& other)
   {
     basic_file tmp(std::move(other));
     impl_ = std::move(tmp.impl_);
     return *this;
   }
 
   /// Get the executor associated with the object.
   const executor_type& get_executor() noexcept
   {
     return impl_.get_executor();
   }
 
   /// Open the file using the specified path.
   /**
    * This function opens the file so that it will use the specified path.
    *
    * @param path The path name identifying the file to be opened.
    *
    * @param open_flags A set of flags that determine how the file should be
    * opened.
    *
    * @throws boost::system::system_error Thrown on failure.
    *
    * @par Example
    * @code
    * boost::asio::stream_file file(my_context);
    * file.open("/path/to/my/file", boost::asio::stream_file::read_only);
    * @endcode
    */
   void open(const char* path, file_base::flags open_flags)
   {
     boost::system::error_code ec;
     impl_.get_service().open(impl_.get_implementation(), path, open_flags, ec);
     boost::asio::detail::throw_error(ec, "open");
   }
 
   /// Open the file using the specified path.
   /**
    * This function opens the file so that it will use the specified path.
    *
    * @param path The path name identifying the file to be opened.
    *
    * @param open_flags A set of flags that determine how the file should be
    * opened.
    *
    * @param ec Set to indicate what error occurred, if any.
    *
    * @par Example
    * @code
    * boost::asio::stream_file file(my_context);
    * boost::system::error_code ec;
    * file.open("/path/to/my/file", boost::asio::stream_file::read_only, ec);
    * if (ec)
    * {
    *   // An error occurred.
    * }
    * @endcode
    */
   BOOST_ASIO_SYNC_OP_VOID open(const char* path,
       file_base::flags open_flags, boost::system::error_code& ec)
   {
     impl_.get_service().open(impl_.get_implementation(), path, open_flags, ec);
     BOOST_ASIO_SYNC_OP_VOID_RETURN(ec);
   }
 
   /// Open the file using the specified path.
   /**
    * This function opens the file so that it will use the specified path.
    *
    * @param path The path name identifying the file to be opened.
    *
    * @param open_flags A set of flags that determine how the file should be
    * opened.
    *
    * @throws boost::system::system_error Thrown on failure.
    *
    * @par Example
    * @code
    * boost::asio::stream_file file(my_context);
    * file.open("/path/to/my/file", boost::asio::stream_file::read_only);
    * @endcode
    */
   void open(const std::string& path, file_base::flags open_flags)
   {
     boost::system::error_code ec;
     impl_.get_service().open(impl_.get_implementation(),
         path.c_str(), open_flags, ec);
     boost::asio::detail::throw_error(ec, "open");
   }
 
   /// Open the file using the specified path.
   /**
    * This function opens the file so that it will use the specified path.
    *
    * @param path The path name identifying the file to be opened.
    *
    * @param open_flags A set of flags that determine how the file should be
    * opened.
    *
    * @param ec Set to indicate what error occurred, if any.
    *
    * @par Example
    * @code
    * boost::asio::stream_file file(my_context);
    * boost::system::error_code ec;
    * file.open("/path/to/my/file", boost::asio::stream_file::read_only, ec);
    * if (ec)
    * {
    *   // An error occurred.
    * }
    * @endcode
    */
   BOOST_ASIO_SYNC_OP_VOID open(const std::string& path,
       file_base::flags open_flags, boost::system::error_code& ec)
   {
     impl_.get_service().open(impl_.get_implementation(),
         path.c_str(), open_flags, ec);
     BOOST_ASIO_SYNC_OP_VOID_RETURN(ec);
   }
 
   /// Assign an existing native file to the file.
   /*
    * This function opens the file to hold an existing native file.
    *
    * @param native_file A native file.
    *
    * @throws boost::system::system_error Thrown on failure.
    */
   void assign(const native_handle_type& native_file)
   {
     boost::system::error_code ec;
     impl_.get_service().assign(
         impl_.get_implementation(), native_file, ec);
     boost::asio::detail::throw_error(ec, "assign");
   }
 
   /// Assign an existing native file to the file.
   /*
    * This function opens the file to hold an existing native file.
    *
    * @param native_file A native file.
    *
    * @param ec Set to indicate what error occurred, if any.
    */
   BOOST_ASIO_SYNC_OP_VOID assign(const native_handle_type& native_file,
       boost::system::error_code& ec)
   {
     impl_.get_service().assign(
         impl_.get_implementation(), native_file, ec);
     BOOST_ASIO_SYNC_OP_VOID_RETURN(ec);
   }
 
   /// Determine whether the file is open.
   bool is_open() const
   {
     return impl_.get_service().is_open(impl_.get_implementation());
   }
 
   /// Close the file.
   /**
    * This function is used to close the file. Any asynchronous read or write
    * operations will be cancelled immediately, and will complete with the
    * boost::asio::error::operation_aborted error.
    *
    * @throws boost::system::system_error Thrown on failure. Note that, even if
    * the function indicates an error, the underlying descriptor is closed.
    */
   void close()
   {
     boost::system::error_code ec;
     impl_.get_service().close(impl_.get_implementation(), ec);
     boost::asio::detail::throw_error(ec, "close");
   }
 
   /// Close the file.
   /**
    * This function is used to close the file. Any asynchronous read or write
    * operations will be cancelled immediately, and will complete with the
    * boost::asio::error::operation_aborted error.
    *
    * @param ec Set to indicate what error occurred, if any. Note that, even if
    * the function indicates an error, the underlying descriptor is closed.
    *
    * @par Example
    * @code
    * boost::asio::stream_file file(my_context);
    * ...
    * boost::system::error_code ec;
    * file.close(ec);
    * if (ec)
    * {
    *   // An error occurred.
    * }
    * @endcode
    */
   BOOST_ASIO_SYNC_OP_VOID close(boost::system::error_code& ec)
   {
     impl_.get_service().close(impl_.get_implementation(), ec);
     BOOST_ASIO_SYNC_OP_VOID_RETURN(ec);
   }
 
   /// Release ownership of the underlying native file.
   /**
    * This function causes all outstanding asynchronous read and write
    * operations to finish immediately, and the handlers for cancelled
    * operations will be passed the boost::asio::error::operation_aborted error.
    * Ownership of the native file is then transferred to the caller.
    *
    * @throws boost::system::system_error Thrown on failure.
    *
    * @note This function is unsupported on Windows versions prior to Windows
    * 8.1, and will fail with boost::asio::error::operation_not_supported on
    * these platforms.
    */
 #if defined(BOOST_ASIO_MSVC) && (BOOST_ASIO_MSVC >= 1400) \
   && (!defined(_WIN32_WINNT) || _WIN32_WINNT < 0x0603)
   __declspec(deprecated("This function always fails with "
         "operation_not_supported when used on Windows versions "
         "prior to Windows 8.1."))
 #endif
   native_handle_type release()
   {
     boost::system::error_code ec;
     native_handle_type s = impl_.get_service().release(
         impl_.get_implementation(), ec);
     boost::asio::detail::throw_error(ec, "release");
     return s;
   }
 
   /// Release ownership of the underlying native file.
   /**
    * This function causes all outstanding asynchronous read and write
    * operations to finish immediately, and the handlers for cancelled
    * operations will be passed the boost::asio::error::operation_aborted error.
    * Ownership of the native file is then transferred to the caller.
    *
    * @param ec Set to indicate what error occurred, if any.
    *
    * @note This function is unsupported on Windows versions prior to Windows
    * 8.1, and will fail with boost::asio::error::operation_not_supported on
    * these platforms.
    */
 #if defined(BOOST_ASIO_MSVC) && (BOOST_ASIO_MSVC >= 1400) \
   && (!defined(_WIN32_WINNT) || _WIN32_WINNT < 0x0603)
   __declspec(deprecated("This function always fails with "
         "operation_not_supported when used on Windows versions "
         "prior to Windows 8.1."))
 #endif
   native_handle_type release(boost::system::error_code& ec)
   {
     return impl_.get_service().release(impl_.get_implementation(), ec);
   }
 
   /// Get the native file representation.
   /**
    * This function may be used to obtain the underlying representation of the
    * file. This is intended to allow access to native file functionality
    * that is not otherwise provided.
    */
   native_handle_type native_handle()
   {
     return impl_.get_service().native_handle(impl_.get_implementation());
   }
 
   /// Cancel all asynchronous operations associated with the file.
   /**
    * This function causes all outstanding asynchronous read and write
    * operations to finish immediately, and the handlers for cancelled
    * operations will be passed the boost::asio::error::operation_aborted error.
    *
    * @throws boost::system::system_error Thrown on failure.
    *
    * @note Calls to cancel() will always fail with
    * boost::asio::error::operation_not_supported when run on Windows XP, Windows
    * Server 2003, and earlier versions of Windows, unless
    * BOOST_ASIO_ENABLE_CANCELIO is defined. However, the CancelIo function has
    * two issues that should be considered before enabling its use:
    *
    * @li It will only cancel asynchronous operations that were initiated in the
    * current thread.
    *
    * @li It can appear to complete without error, but the request to cancel the
    * unfinished operations may be silently ignored by the operating system.
    * Whether it works or not seems to depend on the drivers that are installed.
    *
    * For portable cancellation, consider using the close() function to
    * simultaneously cancel the outstanding operations and close the file.
    *
    * When running on Windows Vista, Windows Server 2008, and later, the
    * CancelIoEx function is always used. This function does not have the
    * problems described above.
    */
 #if defined(BOOST_ASIO_MSVC) && (BOOST_ASIO_MSVC >= 1400) \
   && (!defined(_WIN32_WINNT) || _WIN32_WINNT < 0x0600) \
   && !defined(BOOST_ASIO_ENABLE_CANCELIO)
   __declspec(deprecated("By default, this function always fails with "
         "operation_not_supported when used on Windows XP, Windows Server 2003, "
         "or earlier. Consult documentation for details."))
 #endif
   void cancel()
   {
     boost::system::error_code ec;
     impl_.get_service().cancel(impl_.get_implementation(), ec);
     boost::asio::detail::throw_error(ec, "cancel");
   }
 
   /// Cancel all asynchronous operations associated with the file.
   /**
    * This function causes all outstanding asynchronous read and write
    * operations to finish immediately, and the handlers for cancelled
    * operations will be passed the boost::asio::error::operation_aborted error.
    *
    * @param ec Set to indicate what error occurred, if any.
    *
    * @note Calls to cancel() will always fail with
    * boost::asio::error::operation_not_supported when run on Windows XP, Windows
    * Server 2003, and earlier versions of Windows, unless
    * BOOST_ASIO_ENABLE_CANCELIO is defined. However, the CancelIo function has
    * two issues that should be considered before enabling its use:
    *
    * @li It will only cancel asynchronous operations that were initiated in the
    * current thread.
    *
    * @li It can appear to complete without error, but the request to cancel the
    * unfinished operations may be silently ignored by the operating system.
    * Whether it works or not seems to depend on the drivers that are installed.
    *
    * For portable cancellation, consider using the close() function to
    * simultaneously cancel the outstanding operations and close the file.
    *
    * When running on Windows Vista, Windows Server 2008, and later, the
    * CancelIoEx function is always used. This function does not have the
    * problems described above.
    */
 #if defined(BOOST_ASIO_MSVC) && (BOOST_ASIO_MSVC >= 1400) \
   && (!defined(_WIN32_WINNT) || _WIN32_WINNT < 0x0600) \
   && !defined(BOOST_ASIO_ENABLE_CANCELIO)
   __declspec(deprecated("By default, this function always fails with "
         "operation_not_supported when used on Windows XP, Windows Server 2003, "
         "or earlier. Consult documentation for details."))
 #endif
   BOOST_ASIO_SYNC_OP_VOID cancel(boost::system::error_code& ec)
   {
     impl_.get_service().cancel(impl_.get_implementation(), ec);
     BOOST_ASIO_SYNC_OP_VOID_RETURN(ec);
   }
 
   /// Get the size of the file.
   /**
    * This function determines the size of the file, in bytes.
    *
    * @throws boost::system::system_error Thrown on failure.
    */
   uint64_t size() const
   {
     boost::system::error_code ec;
     uint64_t s = impl_.get_service().size(impl_.get_implementation(), ec);
     boost::asio::detail::throw_error(ec, "size");
     return s;
   }
 
   /// Get the size of the file.
   /**
    * This function determines the size of the file, in bytes.
    *
    * @param ec Set to indicate what error occurred, if any.
    */
   uint64_t size(boost::system::error_code& ec) const
   {
     return impl_.get_service().size(impl_.get_implementation(), ec);
   }
 
   /// Alter the size of the file.
   /**
    * This function resizes the file to the specified size, in bytes. If the
    * current file size exceeds @c n then any extra data is discarded. If the
    * current size is less than @c n then the file is extended and filled with
    * zeroes.
    *
    * @param n The new size for the file.
    *
    * @throws boost::system::system_error Thrown on failure.
    */
   void resize(uint64_t n)
   {
     boost::system::error_code ec;
     impl_.get_service().resize(impl_.get_implementation(), n, ec);
     boost::asio::detail::throw_error(ec, "resize");
   }
 
   /// Alter the size of the file.
   /**
    * This function resizes the file to the specified size, in bytes. If the
    * current file size exceeds @c n then any extra data is discarded. If the
    * current size is less than @c n then the file is extended and filled with
    * zeroes.
    *
    * @param n The new size for the file.
    *
    * @param ec Set to indicate what error occurred, if any.
    */
   BOOST_ASIO_SYNC_OP_VOID resize(uint64_t n, boost::system::error_code& ec)
   {
     impl_.get_service().resize(impl_.get_implementation(), n, ec);
     BOOST_ASIO_SYNC_OP_VOID_RETURN(ec);
   }
 
   /// Synchronise the file to disk.
   /**
    * This function synchronises the file data and metadata to disk. Note that
    * the semantics of this synchronisation vary between operation systems.
    *
    * @throws boost::system::system_error Thrown on failure.
    */
   void sync_all()
   {
     boost::system::error_code ec;
     impl_.get_service().sync_all(impl_.get_implementation(), ec);
     boost::asio::detail::throw_error(ec, "sync_all");
   }
 
   /// Synchronise the file to disk.
   /**
    * This function synchronises the file data and metadata to disk. Note that
    * the semantics of this synchronisation vary between operation systems.
    *
    * @param ec Set to indicate what error occurred, if any.
    */
   BOOST_ASIO_SYNC_OP_VOID sync_all(boost::system::error_code& ec)
   {
     impl_.get_service().sync_all(impl_.get_implementation(), ec);
     BOOST_ASIO_SYNC_OP_VOID_RETURN(ec);
   }
 
   /// Synchronise the file data to disk.
   /**
    * This function synchronises the file data to disk. Note that the semantics
    * of this synchronisation vary between operation systems.
    *
    * @throws boost::system::system_error Thrown on failure.
    */
   void sync_data()
   {
     boost::system::error_code ec;
     impl_.get_service().sync_data(impl_.get_implementation(), ec);
     boost::asio::detail::throw_error(ec, "sync_data");
   }
 
   /// Synchronise the file data to disk.
   /**
    * This function synchronises the file data to disk. Note that the semantics
    * of this synchronisation vary between operation systems.
    *
    * @param ec Set to indicate what error occurred, if any.
    */
   BOOST_ASIO_SYNC_OP_VOID sync_data(boost::system::error_code& ec)
   {
     impl_.get_service().sync_data(impl_.get_implementation(), ec);
     BOOST_ASIO_SYNC_OP_VOID_RETURN(ec);
   }
 
 protected:
   /// Protected destructor to prevent deletion through this type.
   /**
    * This function destroys the file, cancelling any outstanding asynchronous
    * operations associated with the file as if by calling @c cancel.
    */
   ~basic_file()
   {
   }
 
 #if defined(BOOST_ASIO_HAS_IOCP)
   detail::io_object_impl<detail::win_iocp_file_service, Executor> impl_;
 #elif defined(BOOST_ASIO_HAS_IO_URING)
   detail::io_object_impl<detail::io_uring_file_service, Executor> impl_;
 #endif
 
 private:
   // Disallow copying and assignment.
   basic_file(const basic_file&) = delete;
   basic_file& operator=(const basic_file&) = delete;
 };
 
 } // namespace asio
 } // namespace boost
 
 #include <boost/asio/detail/pop_options.hpp>
 
 #endif // defined(BOOST_ASIO_HAS_FILE)
        //   || defined(GENERATING_DOCUMENTATION)
 
 #endif // BOOST_ASIO_BASIC_FILE_HPP

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