-----Original Message----- From: boost-bounces@lists.boost.org [mailto:boost-bounces@lists.boost.org] On Behalf Of Michael Walter By formatting on-demand, we would create an attribute whenever it is used. That is, if (and only if) your filter requires the text attribute, it would be generated. Or do I misunderstand you concern?
[Joe] No, you have my concern right. I am unlikely to use such a feature and want to be sure that the filter check is as quick as possible for the kinds of things I am likely to use. In other words, my goal is as close to zero overhead as possible if a message is not desired, but if I go in and set the registry/config option to turn the log message on, then I want to see it and at that point I don't care when the message is formatted to it's final form. Are you envisioning keeping the message as a tuple of data items and manipulators and then evaluating them as late as possible? joe