Re: [boost] math/tools/rational.hpp gcc 3.2 problem

Subject: Re: [boost] math/tools/rational.hpp gcc 3.2 problem
From: Paul A. Bristow (pbristow_at_[hidden])
Date: 2009-10-14 07:43:50

> -----Original Message-----
> From: boost-bounces_at_[hidden] [mailto:boost-bounces_at_[hidden]] On
Behalf Of
> Ralf W. Grosse-Kunstleve
> Sent: Thursday, October 08, 2009 5:55 PM
> To: boost_at_[hidden]
> Subject: [boost] math/tools/rational.hpp gcc 3.2 problem
> 
> gcc 3.2 doesn't compile this code (works with gcc 3.3 and up):
> 
> #include <boost/math/distributions.hpp>
> int
> main()
> {
>   boost::math::students_t_distribution<double> dist(1.);
>   dist.find_degrees_of_freedom(1.,2.,3.,4.,5.);
>   return 0;
> }
> 
> 
> 
> Reduced:
> 
> template <unsigned N, class T, class V>
> inline V evaluate_polynomial(const T(&a)[N], const V& val)
> {
>   return val * a[0] * static_cast<T>(N);
> }
> 
> int
> main()
> {
>   double a[3];
>   double val;
>   double result = evaluate_polynomial(a, val);
>   return static_cast<int>(result);
> }
> 
> 
> dbg2.cpp: In function `int main()':
> dbg2.cpp:12: no matching function for call to `
>    evaluate_polynomial(double[3], double&)'
> 
> 
> Does anyone have an idea for working around the problem?

It looks as though compliance testing was done with Linux GNU C++ 3.4
(performance was done with Cygwin G++ 3.4  - and John Maddock notes that 4.
optimises much better).

So sorry but I don't have any suggestions - apart from using gcc 3.3 or up ;-)

Paul

---
Paul A. Bristow
Prizet Farmhouse
Kendal, UK   LA8 8AB
[phone], mobile [phone]
pbristow_at_[hidden]