[ublas] Codewarrior 9.4 problems

From: Michael Stevens (mail_at_[hidden])
Date: 2006-04-14 05:00:57

Looking at the the current Boost regression test results for uBLAS

http://engineering.meta-comm.com/boost-regression/CVS-HEAD/developer/numeric-ublas.html

I see we have a problem with Codewarrior as follows.

#      In: ..\boost\numeric\ublas\vector.hpp
#    From: ..\libs\numeric\ublas\test\test1\test11.cpp
# ----------------------------------------------------
#     702:                 return zero_;   // arbitary return value 
#   Error:                             ^
#   illegal access from 'boost::numeric::ublas::zero_vector<int>' to 
protected/private member 'boost::numeric::ublas::zero_vector<int>::zero_'

Basiclly the compiler has problems with the following class definition:

    template<class T>
   class zero_vector {
   public:
        typedef T value_type;
        typedef const T &const_reference;

            const_reference operator * () const {
                return zero_;
            }
    private:
        static const value_type zero_;
    };

Without looking for paragraph and verse in the ISO standard this seems odd. 
The accessor function operator* is 'leaking' a reference to the private zero_ 
member which is unusual but necessary. This is why we have accessor functions 
to control such access. In this case it only leaks a 'safe' const_reference.

Any ideas from someone more knowledgable of CW if this a know bug or if there 
is an easy workaround?

Michael
-- 
___________________________________
Michael Stevens Systems Engineering
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Phone/Fax: [phone]
Navigation Systems, Estimation  and
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    http://bayesclasses.sf.net
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