Operators as function arguments?

[Jarrett Billingsley]

"Falk Henrich" <schreibmalwieder at hammerfort.de> wrote in message 
news:eu1cm8$k2i$1 at digitalmars.com...
>
> But this is extremely clumsy. Any idea?
>

Perhaps?

typeof(a[0]) reduce(alias a, alias func)()
{
    auto ret = a[0];

    foreach(v; a[1 .. $])
        ret = func(ret, v);

    return ret;
}

T[] cat(T)(T[] a, T[] b)
{
    return a ~ b;
}

void main()
{
    int[][] a = [[1, 2, 3], [4, 5, 6], [7, 8, 9]];
    int[] b;

    b = reduce!(a, cat)();
    writefln(b);
}

Using the alias parameter for the function means you can no longer use 
delegate literals for the function, but..