Gennaro Prota wrote:
I don't want to start a religion war about which compiler is better or smarter or encourages a better style. I agree that recognizing the include guard idiom is a good thing, probably the best thing to do for a compiler.[snip] The fact that it is useful to reduce compilation time is just a result of some compiler writers' attitude to prefer encouraging the use of non-standard features rather than e.g. recognizing the include guard idiom and optimize away the subsequent #includes (as for instance g++ does).
Yet I'm stuck with MSVC anyway, as many other programmers out there, and #pragma once may have a significant effect on compilation time on that compiler. I just suggested a way to allow other compilers (there may be fewer than I may think of, obviously) to use the #pragma and also to be a little more descriptive. It's just a matter of a three line addition in config/compiler/visualc.hpp:
#if _MSC_VER >= 1020
#define BOOST_HAS_PRAGMA_ONCE
#endif
for example also Metrowerks CodeWarrior supports #pragma once, so the #define could also be added to config/compiler/metrowerks.hpp.
Cheers,
Alberto Barbati
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