opCmp with double values

[drug]

25.12.2017 09:50, Ali Çehreli пишет:
> On 12/24/2017 02:10 AM, kerdemdemir wrote:
> 
>  >          if (  fabs(diff) < 0.00000001 )
> 
> I can't answer your question but I know that the comparison above is 
> wrong because it can be meaningful only if the values are sufficiently 
> larger than that hard-coded value.
> 
> I think feqrel() will be useful there:
> 
>    https://dlang.org/phobos/std_math.html#.feqrel
> 
> Ali
> 
I'd do something like that (disclaimer - from memory):
```
     int opCmp( T rhs ) const {
         auto diff = curVal - rhs;
	auto epsilon = max(curVal.epsilon, rhs.epsilon);
         if (  fabs(diff) < epsilon )
             return 0;
         else if ( diff < 0 )
             return -1;
         else
             return 1;
     }
```
so in this case epsilon is also floating.