Understanding alias template parameters

[Salih Dincer]

On Friday, 22 April 2022 at 08:04:16 UTC, JG wrote:
> On Thursday, 21 April 2022 at 21:02:47 UTC, JG wrote:
>> Hi,
>>
>> Could someone possibly help me to understand why the commented 
>> line doesn't compile?
>>
>>

Good job, works great! Potential is high:

```d
void main()
{
   alias type = real;
   auto range = iota!type(1, 4, .5);

   alias fun1 = (type a) => a * a;
   alias fun2 = (type a) => a * 2;
   alias fun3 = (type a) => a + 1;
   alias fun4 = (type a) => a - 1;
   alias fun5 = (type a) => a / 2;

   alias func = type function(type a);
   alias MR = MapResult!(typeof(range), func);

   MR[] mr;
   tuple(fun1, fun2, fun3, fun4, fun5)
        .each!(f => mr ~= MR(range, f));

   mr.writefln!"%-(%s\n%)";

} /* OUTPUT:
[1, 2.25, 4, 6.25, 9, 12.25]
[2, 3, 4, 5, 6, 7]
[2, 2.5, 3, 3.5, 4, 4.5]
[0, 0.5, 1, 1.5, 2, 2.5]
[0.5, 0.75, 1, 1.25, 1.5, 1.75]
*/
```