Zachary Turner wrote:
It seems someone else in the thread has already run benchmarks on GCC, but regardless of how the benchmarks did or did not turn out, I can say with 100% certainty that nobody will suffer. That's the exact reason I mentioned that compilers should be whitelisted based on which ones benefit from #pragma once, and only use #pragma once for said compilers.
#if defined(_MSC_VER) && (_MSC_VER >= 1020) #pragma once #endif
That's all it takes. Everybody benefits. Of course I don't have licenses for every C++ compiler around, but I'm sure there are other compilres in which it benefits also. So I would need some assistance from other people who do have other compilers to help find out which compilers it does offer an improvement on.
I think one sure-fire way to get most people to at least try it would be to write a script that adds this to each header in their boost installation. I'd be willing to try it (make sure it runs on Linux!) -- Sohail Somani http://uint32t.blogspot.com