How to flush the ostringstream buffer?

Thread view:

Enable EMail Alerts

Start New Thread

Thread rating:

Bill Sun - 08 Jul 2004 04:22 GMT

Hi,

I have a quetion about to refresh the ostringstream buffer: like this.

ostringstream buffer;

buffer << 245;
// then the buffer.str() = "245";

.....
//next I want using this buffer again but I don't need the content of buffer
before, so
buffer.flush()
buffer << 456;
//here I hope I can get "456" from buffer.str()

but the buffer still is 245456, seem the buffer.flush not take function?

why?

who can help me?

Thanks adanveced,

Bill

Reply to this Message

GuitarBill - 08 Jul 2004 05:03 GMT

flush() doesn't clear the stream; it writes any pending [buffered] data
(useful for file streams which hold written data in memory buffer and only
actually write to file when buffer gets full or someone calls flush).
Try seekp(0) to set insert position back to start, thereby emptying string?

Bill

> Hi,
>
[quoted text clipped - 21 lines]
>
> Bill

Reply to this Message

Jonathan Turkanis - 08 Jul 2004 05:33 GMT

> Hi,

> I have a quetion about to refresh the ostringstream buffer: like this.
>
[quoted text clipped - 9 lines]
> buffer << 456;
> //here I hope I can get "456" from buffer.str()

You should use

buffer.str("");

to reset the contents of the buffer to an empty string.

Jonathan

Reply to this Message

How to flush the ostringstream buffer?

Free Magazines