Re: Compilation Bug in Quantlib Array

Posted by Luigi Ballabio-2 on
URL: http://quantlib.414.s1.nabble.com/Date-problem-in-swaptionhelper-cpp-tp2210p2213.html

Hi Bill,

At 11:08 AM -0400 9/28/02, Bill wrote:
>  I am experiencing compilation problems with
>  Microsoft VC6 on quantlib section Array.h.
>  I believe the problem is in the std::ptr_fun  it won't run in
>  release mode  gives strange error messages like not enough
>  arguments.

Hmm. Could you send me the error, to see if I can make head or tail of it?

>Since its function is to make abs derive from
>  std::unary function the trick is to do it the long way.
>  Replace the above code with
>
>
>   template <class T1, class T2>
>   struct qlfabs : public std::unary_function<T1, T2>
>   {  T1 operator() (T2 x ) const
>    {return ::abs(x) ; }
>   };
>
>         inline Array Abs(const Array& v) {
>             Array result(v.size());
>             std::transform(v.begin(),v.end(),result.begin(),
>                 //std::ptr_fun(QL_FABS));
>         qlfabs<double, double>());
>             return result;
>         }
>
>
>   You also have to do this with Sqrt, Log,and Exp.

Well, the purpose of using std::ptr_fun was brevity. If it gives
problems, I guess the next simplest way would be to write

         inline Array Abs(const Array& v) {
             Array result(v.size());
             for (unsigned i=0; i<v.size(); i++)
                 result[i] = QL_FABS(v[i]);
             return result;
         }

Thanks for the report,
                        Luigi