Using map result type

[Meta]

On Wednesday, 11 December 2019 at 20:08:37 UTC, Meta wrote:
> import std.algorithm;
> import std.range;
>
> void mapAccepter(E)(InputRange!E r)
> {
>     import std.array: array;
>     import std.stdio: writeln;
>
>     auto collected = r.array;
>     writeln(collected);
> }
>
> void main()
> {
>     int[] nums = [1, 2, 3];
>     auto evenness = inputRangeObject(map!(n => n % 2 == 
> 0)(nums));
>     mapAccepter(evenness);
> }

I guess I should mention, that if you are expecting a range of 
booleans, you can of course write  mapAccepter as a non-templated 
function:

void mapAccepter(InputRange!bool r);

But if you want to support any type of input range, the function 
needs to at least be templated on the element type of the range.