NAME
redi::basic_ipstream - Class template for Input 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_ipstream ()
Default constructor, creates an uninitialised stream.
basic_ipstream (const std::string &command, 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 ()
Destructor.
void open (const std::string &command, 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.
void close ()
Close the pipe.
bool is_open () const
Report whether the streams 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.
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 & command, 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:
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_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 () [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 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
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_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)
template<typename CharT, typename Traits = std::char_traits<CharT>> void
redi::basic_ipstream< CharT, Traits >::open (const std::string &
command, pmode mode = pstdout) [inline]
Start a process.
Calls do_open( command , mode|pstdout ).
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>>
basic_ipstream& redi::basic_ipstream< CharT, Traits >::out () [inline]
Set streambuf to read from process’ stdout.
Returns:
*this
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.
Author
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