Re: [boost] Proposal for #pragma once support

Subject: Re: [boost] Proposal for #pragma once support
From: John Maddock (john_at_[hidden])
Date: 2009-06-10 04:39:19

> I agree that it would need to be automated.  But the script itself should 
> be
> very trivial, I'd be willing to try it myself.  And perhaps the best
> approach is what I mentioned in a previous post, to force the programmer 
> to
> explicitly define BOOST_USE_PRAGMA_ONCE before including a boost header
> file.  This would solve the problem of having to modify every header when
> new compilers were released.  And since by default it would be undefined, 
> an
> out-of-the-box boost installation would work exactly as it does now.  I'll
> work on this a bit later today perhaps, and try to post some benchmarks 
> for
> for compiling boost itself, and for compiling a commercial product which
> uses boost.

Thanks Zach, that would be really useful!

John.