Re: [Boost-users] [uBLAS] Compilation problem with VC 7.1

From: Toon Knapen (toon.knapen_at_[hidden])
Date: 2004-06-15 01:15:23

To clarify, the example I posted earlier compiles but the type 
'result_type' is not as expected. It is of type boost::mpl::void_ and 
thus declaring a variable 'result_type i = 0 ; ' results in a 
compilation error.

This problem does not only appear with msvc 7.1 but also with gcc 
(3.2.2) and icc (8.0)

Toon Knapen wrote:

> 
> (cross-posting to ublas-dev)
> 
> Apparantly the problem is the promote_traits. E.g. following snippet 
> prints that the result of the promote_traits is a boost::mpl::void_.
> 
> <code>
> #include <iostream>
> #include <boost/numeric/ublas/vector.hpp>
> 
> namespace ublas = boost::numeric::ublas;
> 
> int main(int argc, char **argv)
> {
>   typedef ublas::promote_traits<short,double>::builtin_promote_type 
> result_type ;
>   std::cout << typeid( result_type ).name() <<std::endl ;
> 
>   return 0;
> }
> </code>
> 
> kjfh kjnk wrote:
> 
>> Hi,
>>  This simple code creates 2 ublas vector and computes
>> the inner_product. It does not compile with VC 7.1:
>>
>> ---------------------------------------------------
>> #include <iostream>
>> #include <string>
>> #include <boost/concept_check.hpp>
>> #include <boost/numeric/ublas/matrix.hpp>
>>
>> namespace ublas = boost::numeric::ublas;
>>
>> int main(int argc, char **argv)
>> {
>>   ublas::vector<unsigned short> toto(3);
>>   ublas::vector<double> tata(3);
>>   double titi = ublas::inner_prod(toto, tata);
>>     return 0;
>> }
>> ---------------------------------------------------
>>
>> Here is the compilation:
>>
>> ***************************************************
>> C:\Temp\ublas>cl -I"C:\Program Files\boost_1_31_0"
>> /EHsc ublas-test.cpp
>> Microsoft (R) 32-bit C/C++ Optimizing Compiler Version
>> 13.10.3052 for 80x86
>> Copyright (C) Microsoft Corporation 1984-2002. All
>> rights reserved.
>>
>> ublas-test.cpp
>> ublas-test.cpp(12) : error C2440: 'initializing' :
>> cannot convert from
>> 'boost::numeric::ublas::vector_scalar_binary_traits<E1,E2,F>::result_type' 
>>
>> to 'double'
>>         with
>>         [
>>             E1=boost::numeric::ublas::vector<unsigned
>> short>,
>>             E2=boost::numeric::ublas::vector<double>,
>>            F=boost::numeric::ublas::vector_inner_prod<unsigned
>> short,double,boost::mpl::if_c<false,unsigned
>> short,boost::numeric::ublas::promote_traits<unsigned
>> short,double>::builtin_promote_type>::type>
>>         ]
>>         No user-defined-conversion operator available
>> that can perform this conversion, or the operator
>> cannot be called
>>
>> C:\Temp\ublas>
>> ****************************************************
>>
>> It compiles well with with VC 6.0, but the result is
>> not good... (with a proper initialisation)
>>
>> Anybody has an idea ?
>>
>> JD
>>
>>
>>     
>>     
>>        
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> 
> 
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