Re: [boost] [Jean-Marc Lasgouttes <[e-mail]>] Re: CVS Update: lyx-devel

From: Jens Maurer (Jens.Maurer_at_[hidden])
Date: 2001-06-01 13:17:12

larsbj_at_[hidden] wrote:
> 
> We are trying to use the boost::crc lib with lyx, but have this
> problem with Compaq cxx:

> Well, the test case is
> ------
> #include <boost/crc.hpp>
> ------
> The error message is

> fantomas: cxx -V
> Compaq C++ V6.2-024 for Digital UNIX V4.0F  (Rev. 1229)

I could reproduce the error.  Note that the regression tests use
Compaq C++ V6.3-008 now.

BOOST_STATIC_CONSTANT is expanded to "static const", not "enum"
on this platform.  I believe this is mostly ok.  Using the "enum"
definition for BOOST_STATIC_CONSTANT leads to the same error.

It appears that this compiler version does not regard integral
constant expressions involving type casts as such.

Here's a fix which makes the regression test work.  This fix
should be further conditioned on __DECCXX_VER < 60300000
(with a comment pointing to Compaq C++ 6.2-024).  The fix
tastes sufficiently bad that I would prefer someone else
checks it into the CVS, possibly after approval by Daryle.

Jens Maurer

diff -u -r1.1 crc.hpp
--- crc.hpp     2001/05/16 12:55:41     1.1
+++ crc.hpp     2001/06/01 18:12:39
@@ -280,10 +280,15 @@
         typedef typename base_type::least  least;
         typedef typename base_type::fast   fast;
 
+#ifdef __DECCXX
+       static const least high_bit = 1ul << ( Bits - 1u );
+        static const fast high_bit_fast = 1ul << ( Bits - 1u );
+#else
         BOOST_STATIC_CONSTANT( least, high_bit = (least( 1u ) << ( Bits
          - 1u )) );
         BOOST_STATIC_CONSTANT( fast, high_bit_fast = (fast( 1u ) << ( Bits
          - 1u )) );
+#endif
 
     };  // boost::detail::high_uint_t
 
@@ -340,7 +345,11 @@
         BOOST_STATIC_CONSTANT( fast, high_bit_fast = base_type::high_bit_fast );
         #endif
 
+#ifdef __DECCXX
+       static const least sig_bits = (~( ~( 0ul ) << Bits )) ;
+#else
         BOOST_STATIC_CONSTANT( least, sig_bits = (~( ~(least( 0u )) << Bits )) );
+#endif
         BOOST_STATIC_CONSTANT( fast, sig_bits_fast = fast(sig_bits) );
 
     };  // boost::detail::mask_uint_t

Jens Maurer