Comparing double and float values

[Andrei Alexandrescu]

On 5/12/11 11:21 AM, Abid H. Mujtaba wrote:
> Section 5.5 Overloading on page 142 it defines the following example
> of a "find" function which searches for slices within slices:
>
> T1[] find( T1, T2 )( T1[] longer, T2[] shorter )
>     if( is( typeof( longer[ 0 .. 1 ] == shorter ) : bool ) )
> {
>     while ( longer.length>= shorter.length ) {
>        if ( longer[0 .. shorter.length] == shorter ) break ;
>     }
>
>     return longer ;
> }
>
> On page 143 it defines the following unittest :
>
> unittest {
>
>     double[] d1 = [ 6.0, 1.5, 2.4, 3 ] ;
>     float[] d2 = [ 1.5, 2.4 ] ;
>
>     assert( find(d1,d2) == d1[1 .. $] ;
> }
>
> It is the assert() that fails since the comparison longer[0 ..
> shorter.length] == shorter fails because the comparison between the
> double and float values fails due to bit precision and
> representation issues.

I see. Thanks! I updated the errata with credit:

http://erdani.com/tdpl/errata


Andrei