## NAME

ACE_Asynch_Read_File_Impl -

Abstract base class for all the concrete implementation classes that provide different implementations for the ACE_Asynch_Read_File::Result.

## SYNOPSIS

    class ACE_Asynch_Read_File_Impl :
      public virtual ACE_Asynch_Read_Stream_Impl
    {
      public:
        inline virtual ~ACE_Asynch_Read_File_Impl ();
        virtual int read (
            ACE_Message_Block &message_block,
            u_long bytes_to_read,
            u_long offset,
            u_long offset_high,
            const void *act,
            int priority,
            int signal_number
            ) = 0;
        virtual int read (
            ACE_Message_Block &message_block,
            u_long bytes_to_read,
            const void *act,
            int priority,
            int signal_number
            ) = 0;
      protected:
        ACE_Asynch_Read_File_Impl (void);
    };

## DESCRIPTION

This class contains asbtract base classes for all the concrete implementation classes for the various asynchronous operations that are used with the Praoctor.

## PUBLIC MEMBERS

    inline virtual ~ACE_Asynch_Read_File_Impl ();

    virtual int read (
        ACE_Message_Block &message_block,
        u_long bytes_to_read,
        u_long offset,
        u_long offset_high,
        const void *act,
        int priority,
        int signal_number
        ) = 0;

This starts off an asynchronous read. Upto `bytes_to_read` will be read and stored in the `message_block`. The read will start at `offset` from the beginning of the file.

    virtual int read (
        ACE_Message_Block &message_block,
        u_long bytes_to_read,
        const void *act,
        int priority,
        int signal_number
        ) = 0;

This starts off an asynchronous read. Upto `bytes_to_read` will be read and stored in the `message_block`.

## PROTECTED MEMBERS

    ACE_Asynch_Read_File_Impl (void);

Do-nothing constructor.

## AUTHOR

Irfan Pyarali (irfan@cs.wustl.edu), Tim Harrison (harrison@cs.wustl.edu) and Alexander Babu Arulanthu `alex@cs.wustl.edu`

## LIBRARY

ace