But I wanted to ask if you have some example demonstrating this, or is it explained in docs. Because frankly speaking I don't understand what you mean here. I type 'make clean' and then I type 'make'. Nothing is precompiled at this stage, so how I can save time?
My app is huge, and it already takes long to compile, so I prefer to use this "one-time cost" solution.
Hi Janek, I may have been a bit imprecise previously - there are two issues here : 1) reprocessing of all the header files with every compilation. this overhead can be mitigated by preprocessing those headers that are stable (don't change frequently) such as Boost library headers. the details depend on which compiler you are using; here's a link to the gcc docs: http://gcc.gnu.org/onlinedocs/gcc-4.0.1/gcc/Precompiled-Headers.html 2) doing the compile-time MPL stuff. here, if your program is really only dealing with a restricted set of units, you can use explicit template instantiation : http://www.network-theory.co.uk/docs/gccintro/gccintro_60.html of course, this only works if you are only working with pre-defined units (like from the SI system); if there are numerous unit computations within your main code, this doesn't solve the problem... Matthias ---------------------------------------------------------------- Matthias Schabel, Ph.D. Assistant Professor, Department of Radiology Utah Center for Advanced Imaging Research 729 Arapeen Drive Salt Lake City, UT 84108 801-587-9413 (work) 801-585-3592 (fax) 801-706-5760 (cell) 801-484-0811 (home) matthias dot schabel at hsc dot utah dot edu ----------------------------------------------------------------