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From: David Abrahams (dave_at_[hidden])
Date: 2004-04-13 10:33:44

Brad Spencer <spencer_at_[hidden]> writes:

> On Fri, Apr 02, 2004 at 06:02:30PM -0500, David Abrahams wrote:
>> Brad Spencer <spencer_at_[hidden]> writes:
>> > In iterator/iterator_facade.hpp, there are a lot of template arguments
>> > that have names like "R1" and "D2". Unfortunately, these "all caps"
>> > tokens are fodder for collisions with macros. On i386-pc-solaris2.8,
>> > for some reason, "R1" is defined to be "9" (it's some kind of register
>> > identification macro)
>> In what header is it defined? Or does it come from the compiler?
> It's in <ia32/sys/reg.h>, which I don't include directly, but ends up
> in the compilation. It looks like it's inside some guards (again,
> which I am not setting directly), but they must resolve to true.
>> There is such a(n informal) policy. Macros with a single capital
>> letter are traditionally used for template parameters, and not
>> normally used by system headers.
> Ok. In this case the macros have a single capital letter and a
> number.
>> > Just using mixed case (or lower case) is
>> > probably enough.
>> I'm not sure what we should do about this. Adopting that policy
>> would require changes to nearly every single Boost header.
> Hmmm. What should I do then?

At the very least we ought to find all of the R1,...R9 identifiers in
Boost and fix them.

Dave Abrahams
Boost Consulting

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