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redi_basic_opstream

NAME

redi::basic_opstream - Class template for Output PStreams.

SYNOPSIS

#include <pstream.h>

Inherits redi::pstream_common< CharT, Traits >< 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 ()
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.)
std::basic_ostream< C, T > & peof (std::basic_ostream< C, T > &s)
Manipulator to close the pipe connected to the process' stdin.

Detailed Description

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.

Constructor & Destructor Documentation

template<typename CharT, typename Traits = std::char_traits<CharT>> redi::basic_opstream< CharT, Traits >::basic_opstream (const std::string & command, pmode mode = pstdin) [inline]

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>> redi::basic_opstream< CharT, Traits >::basic_opstream (const std::string & file, const argv_type & argv, pmode mode = pstdin) [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_opstream< CharT, Traits >::~basic_opstream () [inline]

Destructor.

Closes the stream and waits for the child to exit.

Member Function Documentation

template<typename C, typename T> void redi::pstream_common< C, T >::close () [inline, inherited]

Close the pipe.

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

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

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 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 C, typename T> void redi::pstream_common< C, T >::do_open (const std::string & command, pmode mode) [inline, protected, inherited]

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)

template<typename C, typename T> bool redi::pstream_common< C, T >::is_open () const [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_opstream< CharT, Traits >::open (const std::string & file, const argv_type & argv, pmode mode = pstdin) [inline]

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)

template<typename CharT, typename Traits = std::char_traits<CharT>> void redi::basic_opstream< CharT, Traits >::open (const std::string & command, pmode mode = pstdin) [inline]

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)

template<typename C, typename T> pstream_common< C, T >::streambuf_type * redi::pstream_common< C, T >::rdbuf () const [inline, inherited]

Return a pointer to the stream buffer.

Returns:

a pointer to the private stream buffer member.

Friends And Related Function Documentation

template<typename CharT, typename Traits = std::char_traits<CharT>> std::basic_ostream< C, T > & peof (std::basic_ostream< C, T > & s) [related]

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

Author

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