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[Yue Biek <>]

Sorry, when I use se Point p(1,2),the problem breakdown without any debug information.thank you all the same.

2011/5/16 Bernd Gaertner <>

My guess is that since the decimal value 0.1 is not representable as a double value under the binary IEEE standard, Lazy_exact_NT gives you a surrounding interval that is more than just one point. If so, this particular problem should go away if you use Point p(1,2).

Best,
Bernd.

Yue Biek wrote:

I first write a simple demo to test the validity of C_Point2.
int main()
{
Point p(0.1, 0.2);
MP_FT x = p.x();
std::cout << p.x() << std::endl;
}

However, the problem issued when p.x() executes. I found the error is caused by a test down in to_double() method:
// Interval_nt.h
bool is_point() const
 {
  return sup() == inf();
 }

It seems that it complains the cartesion component of C_Point has different supremum and infimum. If my guess is right, how could this happen?
Really need some pointers here.

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