Re: Newbie question on adding trace statements

Posted by Luigi Ballabio on Jan 03, 2005; 9:11am
URL: http://quantlib.414.s1.nabble.com/Newbie-question-on-adding-trace-statements-tp3463p3464.html

On 12/29/04 09:46:55, Joseph Wang wrote:
> I'd like to add some code into Quantlib to dump out intermediate results  
> for debugging, and it seems that it would be a good thing to have some  
> mechanism that you can turn on trace statements in response to an  
> environment variable.  Something similar to the
> Java Logger facility.
>
> What is the preferred way of doing this in Quantlib?

Joseph,
        there's no such mechanism at the time, but I'd happily insert it. I  
wouldn't go for a full-featured logging facility, though---I'd be happy  
with something as simple as

    QL_TRACE("x = " << x << ", y = " << y);

whose effects would be turned on/off by something like

    Settings::instance().enableTracing();  // or disableTracing()

and whose destination would be set by something like

    Settings::instance().traceTo(std::cerr); // or an ofstream, or whatever

Do you think this would fit the bill?

Later,
        Luigi