NAME

       redi::basic_ipstream - Class template for Input PStreams

SYNOPSIS

       #include <pstream.h>

       Inherits basic_istream< CharT, std::char_traits< CharT > >, redi::pstream_common< CharT,
       std::char_traits< CharT > >, and redi::pstreams.

   Public Types
       typedef pbase_type::pmode pmode
           Type used to specify how to connect to the process.
       typedef pbase_type::argv_type argv_type
           Type used to hold the arguments for a command.
       typedef int fd_type
           Type used for file descriptors.
       typedef int fd_type
           Type used for file descriptors.

   Public Member Functions
       basic_ipstream ()
           Default constructor, creates an uninitialised stream.
       basic_ipstream (const std::string &cmd, pmode mode=pstdout)
           Constructor that initialises the stream by starting a process.
       basic_ipstream (const std::string &file, const argv_type &argv, pmode mode=pstdout)
           Constructor that initialises the stream by starting a process.
       basic_ipstream (const argv_type &argv, pmode mode=pstdout)
           Constructor that initialises the stream by starting a process.
       ~basic_ipstream ()
           Destructor.
       void open (const std::string &cmd, pmode mode=pstdout)
           Start a process.
       void open (const std::string &file, const argv_type &argv, pmode mode=pstdout)
           Start a process.
       basic_ipstream & out ()
           Set streambuf to read from process' stdout.
       basic_ipstream & err ()
           Set streambuf to read from process' stderr.
       int close ()
       bool is_open () const
           Report whether the stream's buffer has been initialised.
       const std::string & command () const
           Return the command used to initialise the stream.
       streambuf_type * rdbuf () const
           Return a pointer to the stream buffer.

   Static Public Attributes
       static const pmode pstdin = std::ios_base::out
           Write to stdin.
       static const pmode pstdout = std::ios_base::in
           Read from stdout.
       static const pmode pstderr = std::ios_base::app
           Read from stderr.
       static const pmode newpg = std::ios_base::trunc
           Create a new process group for the child process.
       static const pmode pstdin = std::ios_base::out
           Write to stdin.
       static const pmode pstdout = std::ios_base::in
           Read from stdout.
       static const pmode pstderr = std::ios_base::app
           Read from stderr.
       static const pmode newpg = std::ios_base::trunc
           Create a new process group for the child process.

   Protected Types
       typedef basic_pstreambuf< CharT, std::char_traits< CharT > > streambuf_type
       typedef std::basic_ios< CharT, std::char_traits< CharT > > ios_type
       enum { bufsz = 32 }
       enum { pbsz = 2 }
       enum { bufsz = 32 }
       enum { pbsz = 2 }

   Protected Member Functions
       void do_open (const std::string &cmd, pmode mode)
           Start a process.
       void do_open (const std::string &file, const argv_type &argv, pmode mode)
           Start a process.

   Protected Attributes
       std::string command_
           The command used to start the process.

Detailed Description

   template<typename CharT, typename Traits = std::char_traits<CharT>>
       class redi::basic_ipstream< CharT, Traits >" Class template for Input PStreams.

       Reading from an ipstream reads the command's standard output and/or standard error
       (depending on how the ipstream is opened) and the command's standard input is the same as
       that of the process that created the object, unless altered by the command itself.

Constructor & Destructor Documentation

   template<typename CharT , typename Traits  = std::char_traits<CharT>> redi::basic_ipstream<
       CharT, Traits >::basic_ipstream (const std::string & cmd, pmode mode = pstdout) [inline],
       [explicit]
       Constructor that initialises the stream by starting a process. Initialises the stream
       buffer by calling do_open() with the supplied arguments.

       Parameters
           cmd a string containing a shell command.
           mode the I/O mode to use when opening the pipe.

       See also
           do_open(const std::string&, pmode)

   template<typename CharT , typename Traits  = std::char_traits<CharT>> redi::basic_ipstream<
       CharT, Traits >::basic_ipstream (const std::string & file, const argv_type & argv, pmode
       mode = pstdout) [inline]
       Constructor that initialises the stream by starting a process. Initialises the stream
       buffer by calling do_open() with the supplied arguments.

       Parameters
           file a string containing the pathname of a program to execute.
           argv a vector of argument strings passed to the new program.
           mode the I/O mode to use when opening the pipe.

       See also
           do_open(const std::string&, const argv_type&, pmode)

   template<typename CharT , typename Traits  = std::char_traits<CharT>> redi::basic_ipstream<
       CharT, Traits >::basic_ipstream (const argv_type & argv, pmode mode = pstdout) [inline],
       [explicit]
       Constructor that initialises the stream by starting a process. Initialises the stream
       buffer by calling do_open(argv[0],argv,mode|pstdout)

       Parameters
           argv a vector of argument strings passed to the new program.
           mode the I/O mode to use when opening the pipe.

       See also
           do_open(const std::string&, const argv_type&, pmode)

   template<typename CharT , typename Traits  = std::char_traits<CharT>> redi::basic_ipstream<
       CharT, Traits >::~basic_ipstream () [inline]
       Destructor. Closes the stream and waits for the child to exit.

Member Function Documentation

   int redi::pstream_common< C, T >::close [inline],  [inherited]
       Close the pipe, returning the program's exit status, as pclose(3) does.

       Calls rdbuf->close() and sets failbit on error. Returns process's exit status, as
       pclose(3) does.

   const std::string & redi::pstream_common< C, T >::command [inline],  [inherited]
       Return the command used to initialise the stream.

       Returns
           a string containing the command used to initialise the stream.

   void redi::pstream_common< C, T >::do_open (const std::string & cmd, pmode mode) [inline],
       [protected],  [inherited]
       Start a process. Calls rdbuf()->open( command , mode ) and sets failbit on error.

       Parameters
           cmd a string containing a shell command.
           mode the I/O mode to use when opening the pipe.

       See also
           basic_pstreambuf::open(const std::string&, pmode)

   void redi::pstream_common< C, T >::do_open (const std::string & file, const argv_type & argv,
       pmode mode) [inline],  [protected],  [inherited]
       Start a process. Calls rdbuf()->open( file, argv, mode ) and sets failbit on error.

       Parameters
           file a string containing the pathname of a program to execute.
           argv a vector of argument strings passed to the new program.
           mode the I/O mode to use when opening the pipe.

       See also
           basic_pstreambuf::open(const std::string&, const argv_type&, pmode)

   template<typename CharT , typename Traits  = std::char_traits<CharT>> basic_ipstream&
       redi::basic_ipstream< CharT, Traits >::err () [inline]
       Set streambuf to read from process' stderr.

       Returns
           *this

       References redi::basic_pstreambuf< CharT, Traits >::read_err().

   bool redi::pstream_common< C, T >::is_open [inline],  [inherited]
       Report whether the stream's buffer has been initialised.

       Returns
           rdbuf()->is_open().

       See also
           basic_pstreambuf::is_open()

   template<typename CharT , typename Traits  = std::char_traits<CharT>> void
       redi::basic_ipstream< CharT, Traits >::open (const std::string & cmd, pmode mode =
       pstdout) [inline]
       Start a process. Calls do_open( cmd , mode|pstdout ).

       Parameters
           cmd a string containing a shell command.
           mode the I/O mode to use when opening the pipe.

       See also
           do_open(const std::string&, pmode)

       References redi::pstream_common< CharT, std::char_traits< CharT > >::do_open().

   template<typename CharT , typename Traits  = std::char_traits<CharT>> void
       redi::basic_ipstream< CharT, Traits >::open (const std::string & file, const argv_type &
       argv, pmode mode = pstdout) [inline]
       Start a process. Calls do_open( file , argv , mode|pstdout ).

       Parameters
           file a string containing the pathname of a program to execute.
           argv a vector of argument strings passed to the new program.
           mode the I/O mode to use when opening the pipe.

       See also
           do_open(const std::string&, const argv_type&, pmode)

       References redi::pstream_common< CharT, std::char_traits< CharT > >::do_open().

   template<typename CharT , typename Traits  = std::char_traits<CharT>> basic_ipstream&
       redi::basic_ipstream< CharT, Traits >::out () [inline]
       Set streambuf to read from process' stdout.

       Returns
           *this

       References redi::basic_pstreambuf< CharT, Traits >::read_err().

   pstream_common< C, T >::streambuf_type * redi::pstream_common< C, T >::rdbuf [inline],
       [inherited]
       Return a pointer to the stream buffer.

       Returns
           a pointer to the private stream buffer member.

Author

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