typed_block< RawSize_, T_, NRef_, InfoType_ > Class Template Reference [Block management layer]

Block containing elements of fixed length. More...

#include <mng.h>

Inheritance diagram for typed_block< RawSize_, T_, NRef_, InfoType_ >:

Collaboration diagram for typed_block< RawSize_, T_, NRef_, InfoType_ >:

List of all members.

Public Types
enum	{ raw_size = RawSize_, size = block_w_info<T_ , size = block_w_info<T_ }
Public Member Functions
request_ptr	write (const BID< raw_size > &bid, completion_handler on_cmpl=default_completion_handler())
	Writes block to the disk(s) !
request_ptr	read (const BID< raw_size > &bid, completion_handler on_cmpl=default_completion_handler())
	Reads block from the disk(s) !

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Detailed Description

template<unsigned RawSize_, class T_, unsigned NRef_ = 0, class InfoType_ = void>
class typed_block< RawSize_, T_, NRef_, InfoType_ >

Block containing elements of fixed length.

Template parameters:

• RawSize_ size of block in bytes
• T_ type of block's records
• NRef_ number of block references (BIDs) that can be stored in the block (default is 0)
• InfoType_ type of per block information (default is no information - void)

The data array of type T_ is contained in the parent class stxxl::element_block, see related information there. The BID array of references is contained in the parent class stxxl::block_w_bids, see related information there. The "per block information" is contained in the parent class stxxl::block_w_info, see related information there.

Warning:

If RawSize_ > 2MB object(s) of this type can not be allocated on the stack (as a function variable for example), because Linux POSIX library limits the stack size for the main thread to (2MB - system page size)

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Member Enumeration Documentation

template<unsigned RawSize_, class T_, unsigned NRef_ = 0, class InfoType_ = void>

anonymous enum

Enumerator:

raw_size	size of block in bytes
size	number of elements in block
size	number of elements in block

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Member Function Documentation

template<unsigned RawSize_, class T_, unsigned NRef_ = 0, class InfoType_ = void>

request_ptr typed_block< RawSize_, T_, NRef_, InfoType_ >::read	(	const BID< raw_size > &	bid,
		completion_handler	on_cmpl = default_completion_handler()
	)			[inline]

Reads block from the disk(s) !

Parameters:

	bid	block identifier, points the file(disk) and position !
	on_cmpl	completion handler !

Returns:

pointer_ptr object to track status I/O operation after the call

template<unsigned RawSize_, class T_, unsigned NRef_ = 0, class InfoType_ = void>

request_ptr typed_block< RawSize_, T_, NRef_, InfoType_ >::write	(	const BID< raw_size > &	bid,
		completion_handler	on_cmpl = default_completion_handler()
	)			[inline]

Writes block to the disk(s) !

Parameters:

	bid	block identifier, points the file(disk) and position !
	on_cmpl	completion handler !

Returns:

pointer_ptr object to track status I/O operation after the call

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

• mng.h