Doesn't MSVC support pre-compiled headers? This will speed up compilation much more than '#pragma once'. Try creating a common header file which includes all of your project's header files, and have all source files include the common header, and compare compile times.
> "#pragma once" is just an optimization issue. If a file is included a > second time in the same TU, a dumb compiler will re-open it and give it > to the preprocessor who strips its contents entirely because the include > guard is already defined. Re-opening + preprocessing takes little but > significant time. > > With the "#pragma once" the programmer just gives an hint to the > compiler that re-opening is unnecessary and ignores the #include > directive immediately. You see, there *is* a speed gain even in the > presence of canonical include guards. HTH, --craig _______________________________________________ Unsubscribe & other changes: http://lists.boost.org/mailman/listinfo.cgi/boost
