stxxl::mem_file Class Reference

Implementation of file based on new[] and memcpy. More...

#include <mem_file.h>

Inheritance diagram for stxxl::mem_file:

Collaboration diagram for stxxl::mem_file:

List of all members.

Public Member Functions
	mem_file (int queue_id=DEFAULT_QUEUE, int allocator_id=NO_ALLOCATOR)
	constructs file object
void	serve (const request *req) throw (io_error)
	~mem_file ()
offset_type	size ()
	Returns size of the file.
void	set_size (offset_type newsize)
	Changes the size of the file.
void	lock ()
	Locks file for reading and writing (acquires a lock in the file system)
void	discard (offset_type offset, offset_type size)
	Discard a region of the file (mark it unused) some specialized file types may need to know freed regions.
const char *	io_type () const
	Identifies the type of I/O implementation.
Private Attributes
char *	ptr
offset_type	sz

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Detailed Description

Implementation of file based on new[] and memcpy.

Definition at line 27 of file mem_file.h.

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Constructor & Destructor Documentation

stxxl::mem_file::mem_file	(	int	queue_id = DEFAULT_QUEUE,
		int	allocator_id = NO_ALLOCATOR
	)		[inline]

constructs file object

Parameters:

disk	disk(file) identifier

Definition at line 35 of file mem_file.h.

stxxl::mem_file::~mem_file

(

)

Definition at line 47 of file mem_file.cpp.

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Member Function Documentation

void stxxl::mem_file::discard	(	offset_type	offset,
		offset_type	size
	)		[virtual]

Discard a region of the file (mark it unused) some specialized file types may need to know freed regions.

Reimplemented from stxxl::file.

Definition at line 70 of file mem_file.cpp.

References BLOCK_ALIGN.

const char * stxxl::mem_file::io_type

(

)

const [virtual]

Identifies the type of I/O implementation.

Returns:

pointer to null terminated string of characters, containing the name of I/O implementation

Reimplemented from stxxl::file.

Definition at line 42 of file mem_file.cpp.

void stxxl::mem_file::lock

(

)

[virtual]

Locks file for reading and writing (acquires a lock in the file system)

Implements stxxl::file.

Definition at line 53 of file mem_file.cpp.

Referenced by stxxl::create_file().

void stxxl::mem_file::serve

(

const request *

req

)

throw (io_error) [virtual]

Implements stxxl::file.

Definition at line 22 of file mem_file.cpp.

void stxxl::mem_file::set_size

(

offset_type

newsize

)

[virtual]

Changes the size of the file.

Parameters:

newsize

new file size

Implements stxxl::file.

Definition at line 63 of file mem_file.cpp.

file::offset_type stxxl::mem_file::size

(

)

[virtual]

Returns size of the file.

Returns:

file size in bytes

Implements stxxl::file.

Definition at line 58 of file mem_file.cpp.

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Member Data Documentation

char* stxxl::mem_file::ptr [private]

Definition at line 29 of file mem_file.h.

offset_type stxxl::mem_file::sz [private]

Definition at line 30 of file mem_file.h.

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

• include/stxxl/bits/io/mem_file.h
• io/mem_file.cpp