The Many Faces of D - slides

[Walter Bright]

Peter Alexander wrote:
> == Quote from Walter Bright (newshound2 at digitalmars.com)'s article
>> This works:
>> import std.stdio;
>> import std.algorithm;
>> alias reduce!"a+b" sum;
>> auto sumOfSquares( R )( R range ) {
>>       return sum( map!"a*a"( range ) );
>> }
>> void main()
>> {
>>      writeln(sumOfSquares([1,2,3]));
>> }
> 
> But then this doesn't:

Darn!

> 
> int[] xs = [];
> writeln(sum(xs));
> 
> but mathematically the sum is well-defined as 0 (and the product as 1).
>