Mojmir Svoboda schrieb:
i know, logs can be really huge.
but i never meant to not provide what you call runtime filtering. i perhaps said something badly. i thought you wanted add another filter at runtime.
what i am saying is: User is not allowed to change format of the logged text at runtime, by changing the formatting chain. i know it can be done, but i don't want to as i consider it unnecessary.
the reason why is that as you have large codebase with lot of outputs, your people probably have tools helping them analyse the logs: regexps, indents, scripts, filters to gnuplot etc etc. if you change order of the logged columns, your tools are confused.
my approach is simply: think before picking format and then let it be the same forever (or at least for some long period). as a library user you can change it during development of course, but to take place, you have to recompile.
I think also that it is not so important to change the format during runtime. It is a nice to have feature but at least for me not a must. If you can configure the output format it has one big advantage: you can change the format of older products without recompiling the program. The most important thing for me that it does not cost a lot of time to format the message.
i hope that is clear, now and sorry for confusion i made.
best regards Hansjörg