[boost] [Boost-bugs] [ boost-Bugs-1553359 ] floating point comparison algorithm

From: SourceForge.net (noreply_at_[hidden])
Date: 2006-09-06 07:59:20

Bugs item #1553359, was opened at 2006-09-06 04:59
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Category: test
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Nobody/Anonymous (nobody)
Assigned to: Beman Dawes (beman_dawes)
Summary: floating point comparison algorithm

Initial Comment:
The floating point comparison algorithm does not seem 
to work if one of the floating points is zero and the 
other one is close to zero. Here's the code sample 
I've used:

close_at_tolerance<double> checker(0.01);

const double a = 0.0;
const double b = 0.0000001;

bool res = checker(a, b);
if (!res)
{
  std::cerr << "ERROR" << std::endl;
}

I think the following check must be added in the 
close_at_tolerance<FPT>::operator() function:
bool operator()( FPT left, FPT right ) const
{
   if (left == 0.0 || right == 0.0)
   {
      return (p_fraction_tolerance.get() >  
              tt_detail::fpt_abs(left-right));
   }

   // ...
}

My email address is "tom.vanroey_at_[hidden]".

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