FStreamSizeHolder Class Reference

FStreamSizeHolder Declaration remembers size of stream chunk for backward compatibility. More...

#include <fstreamer.h>

Public Member Functions
	FStreamSizeHolder (FStreamer &s)
void	beginWrite ()
	remembers position and writes 0
int32	endWrite ()
	writes and returns size (since the start marker)
int32	beginRead ()
	returns size
void	endRead ()
	jump to end of chunk

Protected Attributes
FStreamer &	stream
int64	sizePos

Detailed Description

FStreamSizeHolder Declaration remembers size of stream chunk for backward compatibility.

Example:

externalize (a)
{
    FStreamSizeHolder sizeHolder;
    sizeHolder.beginWrite ();   // sets start mark, writes dummy size
    a << ....
    sizeHolder.endWrite ();     // jumps to start mark, updates size, jumps back here
}

internalize (a)
{
    FStreamSizeHolder sizeHolder;
    sizeHolder.beginRead ();    // reads size, mark
    a >> ....
    sizeHolder.endRead ();      // jumps forward if new version has larger size
}

Constructor & Destructor Documentation

FStreamSizeHolder

(

FStreamer &

s

)

Member Function Documentation

void beginWrite

(

)

remembers position and writes 0

int32 endWrite

(

)

writes and returns size (since the start marker)

int32 beginRead

(

)

returns size

void endRead

(

)

jump to end of chunk

Member Data Documentation

FStreamer& stream

protected

int64 sizePos

protected