I wrote this function for comparing two floating point values:

> import std.math;
> import std.traits;
> 
> bool isEqual(T)(T v1, T v2) if(isFloatingPoint!T) {
>   return T.mant_dig - feqrel(v1, v2) < 2;
> }

What do you think about it?

On Saturday, 14 February 2015 at 09:37:05 UTC, Jack Applegame wrote:
> I wrote this function for comparing two floating point values:
>
>> import std.math;
>> import std.traits;
>> 
>> bool isEqual(T)(T v1, T v2) if(isFloatingPoint!T) {
>>  return T.mant_dig - feqrel(v1, v2) < 2;
>> }
>
> What do you think about it?

I wrote a similar function here:

https://github.com/nomad-software/dunit/blob/master/source/dunit/toolkit.d#L42

or using an epsilon value:

https://github.com/nomad-software/dunit/blob/master/source/dunit/toolkit.d#L134

I don't know if they are useful to you?

On Saturday, 14 February 2015 at 10:23:48 UTC, Gary Willoughby wrote:
> I wrote a similar function here:
>
> https://github.com/nomad-software/dunit/blob/master/source/dunit/toolkit.d#L42
>
> or using an epsilon value:
>
> https://github.com/nomad-software/dunit/blob/master/source/dunit/toolkit.d#L134
>
> I don't know if they are useful to you?

Very interesting. Thanks.

There is an approxEqual in std.math, in addition in feqrel:

http://dlang.org/phobos/std_math.html#.approxEqual

It takes maximum absolute and relative difference as arguments.