redi_basic_opstream (3)

#include <pstream.h>

Inherits basic_ostream< CharT, Traits >, redi::pstream_common< CharT, Traits >, 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_opstream ()

Default constructor, creates an uninitialised stream. basic_opstream (const std::string &command, pmode mode=pstdin)

Constructor that initialises the stream by starting a process. basic_opstream (const std::string &file, const argv_type &argv, pmode mode=pstdin)

Constructor that initialises the stream by starting a process. basic_opstream (const argv_type &argv, pmode mode=pstdin)

Constructor that initialises the stream by starting a process. ~basic_opstream ()

Destructor. void open (const std::string &command, pmode mode=pstdin)

Start a process. void open (const std::string &file, const argv_type &argv, pmode mode=pstdin)

Start a process. void close ()

Close the pipe. 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 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.

Protected Types

typedef basic_pstreambuf

< CharT, Traits > streambuf_type"

enum { bufsz = 32 }

enum { pbsz = 2 }

enum { bufsz = 32 }

enum { pbsz = 2 }

Protected Member Functions

void do_open (const std::string &command, 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. streambuf_type buf_

The stream buffer.

Related Functions

(Note that these are not member functions.) template<typename C , typename T > std::basic_ostream< C, T > & peof (std::basic_ostream< C, T > &s)

Manipulator to close the pipe connected to the process' stdin.

template<typename CharT, typename Traits = std::char_traits<CharT>>class redi::basic_opstream< CharT, Traits >

Class template for Output PStreams.

Writing to an open opstream writes to the standard input of the command; the command's standard output is the same as that of the process that created the pstream object, unless altered by the command itself.

template<typename CharT , typename Traits = std::char_traits<CharT>> \fBredi::basic_opstream\fP< CharT, Traits >::\fBbasic_opstream\fP (const std::string &command, \fBpmode\fPmode = \fC\fBpstdin\fP\fP)\fC [inline]\fP

Constructor that initialises the stream by starting a process. Initialises the stream buffer by calling do_open() with the supplied arguments.

Parameters:

command 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>> \fBredi::basic_opstream\fP< CharT, Traits >::\fBbasic_opstream\fP (const std::string &file, const \fBargv_type\fP &argv, \fBpmode\fPmode = \fC\fBpstdin\fP\fP)\fC [inline]\fP

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>> \fBredi::basic_opstream\fP< CharT, Traits >::\fBbasic_opstream\fP (const \fBargv_type\fP &argv, \fBpmode\fPmode = \fC\fBpstdin\fP\fP)\fC [inline]\fP

Constructor that initialises the stream by starting a process. Initialises the stream buffer by calling do_open(argv[0],argv,mode|pstdin)

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>> \fBredi::basic_opstream\fP< CharT, Traits >::~\fBbasic_opstream\fP ()\fC [inline]\fP

Destructor. Closes the stream and waits for the child to exit.

template<typename C , typename T > void \fBredi::pstream_common\fP< C, T >::close ()\fC [inline]\fP, \fC [inherited]\fP

Close the pipe. Calls rdbuf->close() and sets failbit on error.

template<typename C , typename T > const std::string & \fBredi::pstream_common\fP< C, T >::command () const\fC [inline]\fP, \fC [inherited]\fP

Return the command used to initialise the stream.

Returns:

a string containing the command used to initialise the stream.

template<typename C , typename T > void \fBredi::pstream_common\fP< C, T >::do_open (const std::string &command, \fBpmode\fPmode)\fC [inline]\fP, \fC [protected]\fP, \fC [inherited]\fP

Start a process. Calls rdbuf()->open( command , mode ) and sets failbit on error.

Parameters:

command 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)

Referenced by redi::basic_ipstream< CharT, Traits >::open(), redi::basic_opstream< CharT, Traits >::open(), redi::basic_pstream< CharT, Traits >::open(), redi::basic_rpstream< CharT, Traits >::open(), and redi::pstream_common< CharT, Traits >::pstream_common().

template<typename C , typename T > void \fBredi::pstream_common\fP< C, T >::do_open (const std::string &file, const \fBargv_type\fP &argv, \fBpmode\fPmode)\fC [inline]\fP, \fC [protected]\fP, \fC [inherited]\fP

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 C , typename T > bool \fBredi::pstream_common\fP< C, T >::is_open () const\fC [inline]\fP, \fC [inherited]\fP

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 \fBredi::basic_opstream\fP< CharT, Traits >::open (const std::string &command, \fBpmode\fPmode = \fC\fBpstdin\fP\fP)\fC [inline]\fP

Start a process. Calls do_open( command , mode|pstdin ).

Parameters:

command 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, Traits >::do_open(), and redi::pstreams::pstdin.

template<typename CharT , typename Traits = std::char_traits<CharT>> void \fBredi::basic_opstream\fP< CharT, Traits >::open (const std::string &file, const \fBargv_type\fP &argv, \fBpmode\fPmode = \fC\fBpstdin\fP\fP)\fC [inline]\fP

Start a process. Calls do_open( file , argv , mode|pstdin ).

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, Traits >::do_open(), and redi::pstreams::pstdin.

template<typename C , typename T > \fBpstream_common\fP< C, T >::\fBstreambuf_type\fP * \fBredi::pstream_common\fP< C, T >::rdbuf () const\fC [inline]\fP, \fC [inherited]\fP

Return a pointer to the stream buffer.

Returns:

a pointer to the private stream buffer member.

template<typename C , typename T > std::basic_ostream< C, T > & peof (std::basic_ostream< C, T > &s)\fC [related]\fP

Manipulator to close the pipe connected to the process' stdin. When inserted into an output pstream the manipulator calls basic_pstreambuf<C,T>::peof() to close the output pipe, causing the child process to receive the end-of-file indicator on subsequent reads from its stdin stream.

Parameters:

s An output PStream class.

Returns:

The stream object the manipulator was invoked on.

See Also:

basic_pstreambuf<C,T>::peof() basic_pstream basic_rpstream

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