Emil Dotchevski schrieb am Dienstag 09 Juni 2009 um 21:00:
On Tue, Jun 9, 2009 at 11:19 AM, Zachary Turner <divisortheory@gmail.com> wrote:
#if defined(_MSC_VER) && (_MSC_VER >= 1020) #pragma once #endif
That's all it takes. Everybody benefits.
I'm sorry but what problem are we trying to solve with this? Does compiling Boost take too much time? If the answer is yes, is #pragrma once the best solution we can come up with? :)
While having no experience with "#pragma once", my impression is that it has an positive effect if the filesystem is slow when touching many small files, which I painfully experience on MS.Windows (at least on XP, dunno if Vista and Windows7 suffer from this as well). The point of Zachary's approach is being a non intrusive no brainer solution. All the user has to do is to add a definition to the command line via his/her build system. Well, given that there is an measurable effect on real boost using code. I suggest we wait until Zachary wrote the script and did benchmarks on some of the plenty files at the libs test dirs. -- Maik