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Subject: Re: [boost] [config] polygon library long long, long double portability
From: Hartmut Kaiser (hartmut.kaiser_at_[hidden])
Date: 2009-06-25 23:10:49

> > Simonson, Lucanus J wrote:
> >> I use long long and long double in the configuration of my integer
> >> arithmetic traits. I'd like to guard those usages with boost macros
> >> to allow the code to compile on platforms that don't support long
> >> long and long double (replace with long and double respectively) but
> >> I can only find a BOOST_HAS_LONG_LONG macro (which is apparently not
> >> documented) and not a corresponding BOOST_HAS_LONG_DOUBLE. Is there
> >> some other macro I can use to detect BOOST_HAS_LONG_DOUBLE or a
> >> typedef I can use that is already set to long double if available
> >> and double otherwise?
> >>
> >
> > long double is standard C++. long long is only the
> > the new standard.
> >
> > You might also consider using boost::int64_t from
> > boost/cstdint.hpp guarded by BOOST_NO_INT64_T
> >
> > msvc has 64 bit ints, but doesn't call them long long.
> >
> > In Christ,
> > Steven Watanabe
> >
> Yes, I realized that long double must be standard after grepping the
> boost codebase and seeing it used everywhere. If we searched the
> archive we'd probably find I asked this same question in the past. I
> might be a slow learner. My code with long long compiles in MSVC, does
> is compile to a 32 bit int? Specifying int64_t would make sense if my
> integer coordinate traits were in terms of int32_t, but they are in
> terms of int. Perhaps I should change that as well.

FWIW, Boost has boost::long_long_type and boost::ulong_long_type typedefs
(only if BOOST_HAS_LONG_LONG is defined) representing the platform specific
long long/__int64/etc.

Regards Hartmut

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