Hi Freddie, I reported this strange behaviour on the boost.devel list some time ago. Unfortunately, I did not get an answer. Several people I know ran into this trap and it would be very helpful if a char is converted to int in case of %d formatter. A cast to int should help: std::cout << (fmt % (int)port) << std::endl; Best regards, Philipp On 11/3/06, Wu Yinghui, Freddie <yhwu@volumeinteractions.com> wrote:
Hi all,
I'm using Boost CVS version in the release branch. But according to the change log, it seems that this problem shall exist in Boost 1.33 too.
I have the following code snippet, which doesn't produce the desired output:
typedef unsigned char qquint8; qquint8 port = 1; boost::format fmt("Trying to probe COM%1$d:..."); std::cout << (fmt % port) << std::endl;
The output will was: Trying to probe COM^A:... but what I want should be: Trying to probe COM1:...
I understand that the underlying stream might have treated port as a character, thus output it as a character. But from Boost.Format's documentation, this doesn't seem obvious to me, since it always refers this as "printf-like" format string.
So my question is: Is this considered a bug (thus, shall be fixed), or is it just considered a special case (thus, shall be explicitly documented under the "Differences of behaviour vs printf" section)?
Cheers,
Freddie
-- Wu Yinghui, Freddie Research & Development Senior Software Engineer
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