mem_file Class Reference

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

#include <mem_file.h>

Inheritance diagram for mem_file:

Collaboration diagram for mem_file:

Public Member Functions
	mem_file (int disk=-1)
	constructs file object
request_ptr	aread (void *buffer, stxxl::int64 pos, size_t bytes, completion_handler on_cmpl)
	Schedules asynchronous read request to the file.
request_ptr	awrite (void *buffer, stxxl::int64 pos, size_t bytes, completion_handler on_cmpl)
	Schedules asynchronous write request to the file.
stxxl::int64	size ()
	Returns size of the file.
void	set_size (stxxl::int64 newsize)
	Changes the size of the file.

Additional Inherited Members
Public Types inherited from file
enum	open_mode {   RDONLY = 1, WRONLY = 2, RDWR = 4, CREAT = 8,   DIRECT = 16, TRUNC = 32 }
	Definition of acceptable file open modes. More...
Protected Member Functions inherited from file
	file (int _id)
	Initializes file object.

Detailed Description

Implementation of file based on new[] and memcpy.

Constructor & Destructor Documentation

mem_file::mem_file

(

int

disk = -1

)

constructs file object

Parameters

disk	disk(file) identifier

Member Function Documentation

request_ptr mem_file::aread ( void *  buffer, stxxl::int64  pos, size_t  bytes, completion_handler  on_cmpl  )

virtual

Schedules asynchronous read request to the file.

Parameters

buffer	pointer to memory buffer to read into
pos	starting file position to read
bytes	number of bytes to transfer
on_cmpl	I/O completion handler

Returns

request_ptr object, that can be used to track the status of the operation

Implements file.

References request_ptr::get().

request_ptr mem_file::awrite ( void *  buffer, stxxl::int64  pos, size_t  bytes, completion_handler  on_cmpl  )

virtual

Schedules asynchronous write request to the file.

Parameters

buffer	pointer to memory buffer to write from
pos	starting file position to write
bytes	number of bytes to transfer
on_cmpl	I/O completion handler

Returns

request_ptr object, that can be used to track the status of the operation

Implements file.

References request_ptr::get().

void mem_file::set_size ( stxxl::int64  newsize )

virtual

Changes the size of the file.

Parameters

newsize

value of the new file size

Implements file.

stxxl::int64 mem_file::size ( )

virtual

Returns size of the file.

Returns

file size in bytes

Implements file.

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

• mem_file.h
• mem_file.cpp