The boost logging library does not seem to support late formatting of strings. From tests that I have carried out we can easily get a couple of orders of magnitude perf improvements by not formatting our strings at runtime, but leaving it to a post processor. This makes the difference between logging being feasible or not in high performance sections of code. Clearly late formatting is difficult because it requires the collation of manifest data of some kind for every log message. My implementation simply logs the boost::format string the first time the log message occurs - but that does mean that it's very awkward to turn logging on and off at run time. An alternative implementation is the Windows WPP library, which runs a preprocessor and puts the results into the symbols files (much more difficult to make cross platform). Have I missed a way to use late formatting with boost::logging? Are there any intentions to introduce late formatting to boost::logging? Thanks Jim ________________________________________________________________________ This e-mail, and any attachment, is confidential. If you have received it in error, do not use or disclose the information in any way, notify me immediately, and please delete it from your system. ________________________________________________________________________