pqxx::largeobject_streambuf< CHAR, TRAITS > Class Template Reference

Streambuf to use large objects in standard I/O streams. More...

#include <largeobject.hxx>

Inheritance diagram for pqxx::largeobject_streambuf< CHAR, TRAITS >:

Public Types
using	char_type = CHAR
using	traits_type = TRAITS
using	int_type = typename traits_type::int_type
using	pos_type = typename traits_type::pos_type
using	off_type = typename traits_type::off_type
using	openmode = largeobjectaccess::openmode
using	seekdir = largeobjectaccess::seekdir

Public Member Functions
	largeobject_streambuf (dbtransaction &t, largeobject o, openmode mode=default_mode, size_type buf_size=512)
	largeobject_streambuf (dbtransaction &t, oid o, openmode mode=default_mode, size_type buf_size=512)
virtual	~largeobject_streambuf () noexcept
void	process_notice (zview const &s)
	For use by large object stream classes. More...

Static Public Attributes
static constexpr auto	default_mode
	Default open mode: in, out, binary. More...

Protected Member Functions
virtual int	sync () override
virtual pos_type	seekoff (off_type offset, seekdir dir, openmode) override
virtual pos_type	seekpos (pos_type pos, openmode) override
virtual int_type	overflow (int_type ch) override
virtual int_type	overflow ()
virtual int_type	underflow () override

Detailed Description

template<typename CHAR = char, typename TRAITS = std::char_traits<CHAR>>
class pqxx::largeobject_streambuf< CHAR, TRAITS >

Streambuf to use large objects in standard I/O streams.

Deprecated:

Access large objects directly using the blob class.

The standard streambuf classes provide uniform access to data storage such as files or string buffers, so they can be accessed using standard input or output streams. This streambuf implementation provided similar access to large objects, so they could be read and written using the same stream classes.

This functionality was considered too fragile and complex, so it has been replaced with a single, much simpler class.

Member Typedef Documentation

char_type

template<typename CHAR = char, typename TRAITS = std::char_traits<CHAR>>

using pqxx::largeobject_streambuf< CHAR, TRAITS >::char_type = CHAR

int_type

template<typename CHAR = char, typename TRAITS = std::char_traits<CHAR>>

using pqxx::largeobject_streambuf< CHAR, TRAITS >::int_type = typename traits_type::int_type

off_type

template<typename CHAR = char, typename TRAITS = std::char_traits<CHAR>>

using pqxx::largeobject_streambuf< CHAR, TRAITS >::off_type = typename traits_type::off_type

openmode

template<typename CHAR = char, typename TRAITS = std::char_traits<CHAR>>

using pqxx::largeobject_streambuf< CHAR, TRAITS >::openmode = largeobjectaccess::openmode

pos_type

template<typename CHAR = char, typename TRAITS = std::char_traits<CHAR>>

using pqxx::largeobject_streambuf< CHAR, TRAITS >::pos_type = typename traits_type::pos_type

seekdir

template<typename CHAR = char, typename TRAITS = std::char_traits<CHAR>>

using pqxx::largeobject_streambuf< CHAR, TRAITS >::seekdir = largeobjectaccess::seekdir

traits_type

template<typename CHAR = char, typename TRAITS = std::char_traits<CHAR>>

using pqxx::largeobject_streambuf< CHAR, TRAITS >::traits_type = TRAITS

Constructor & Destructor Documentation

largeobject_streambuf() [1/2]

template<typename CHAR = char, typename TRAITS = std::char_traits<CHAR>>

pqxx::largeobject_streambuf< CHAR, TRAITS >::largeobject_streambuf	(	dbtransaction &	t,
		largeobject	o,
		openmode	mode = default_mode,
		size_type	buf_size = 512
	)

largeobject_streambuf() [2/2]

template<typename CHAR = char, typename TRAITS = std::char_traits<CHAR>>

pqxx::largeobject_streambuf< CHAR, TRAITS >::largeobject_streambuf	(	dbtransaction &	t,
		oid	o,
		openmode	mode = default_mode,
		size_type	buf_size = 512
	)

~largeobject_streambuf()

template<typename CHAR = char, typename TRAITS = std::char_traits<CHAR>>

virtual pqxx::largeobject_streambuf< CHAR, TRAITS >::~largeobject_streambuf ( )

virtualnoexcept

Member Function Documentation

overflow() [1/2]

template<typename CHAR = char, typename TRAITS = std::char_traits<CHAR>>

virtual int_type pqxx::largeobject_streambuf< CHAR, TRAITS >::overflow ( )

protectedvirtual

References pqxx::largeobject_streambuf< CHAR, TRAITS >::overflow().

Referenced by pqxx::largeobject_streambuf< CHAR, TRAITS >::overflow().

overflow() [2/2]

template<typename CHAR = char, typename TRAITS = std::char_traits<CHAR>>

virtual int_type pqxx::largeobject_streambuf< CHAR, TRAITS >::overflow ( int_type  ch )

overrideprotectedvirtual

References pqxx::internal::cmp_less_equal().

process_notice()

template<typename CHAR = char, typename TRAITS = std::char_traits<CHAR>>

void pqxx::largeobject_streambuf< CHAR, TRAITS >::process_notice

(

zview const &

s

)

For use by large object stream classes.

seekoff()

template<typename CHAR = char, typename TRAITS = std::char_traits<CHAR>>

virtual pos_type pqxx::largeobject_streambuf< CHAR, TRAITS >::seekoff ( off_type  offset, seekdir  dir, openmode    )

overrideprotectedvirtual

seekpos()

template<typename CHAR = char, typename TRAITS = std::char_traits<CHAR>>

virtual pos_type pqxx::largeobject_streambuf< CHAR, TRAITS >::seekpos ( pos_type  pos, openmode    )

overrideprotectedvirtual

sync()

template<typename CHAR = char, typename TRAITS = std::char_traits<CHAR>>

virtual int pqxx::largeobject_streambuf< CHAR, TRAITS >::sync ( )

overrideprotectedvirtual

underflow()

template<typename CHAR = char, typename TRAITS = std::char_traits<CHAR>>

virtual int_type pqxx::largeobject_streambuf< CHAR, TRAITS >::underflow ( )

overrideprotectedvirtual

Member Data Documentation

default_mode

template<typename CHAR = char, typename TRAITS = std::char_traits<CHAR>>

constexpr auto pqxx::largeobject_streambuf< CHAR, TRAITS >::default_mode

staticconstexpr

Initial value:

{
    std::ios::in | std::ios::out | std::ios::binary}

Default open mode: in, out, binary.

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The documentation for this class was generated from the following file:

• largeobject.hxx