bearophile wrote:
> ted:
>
>> Could someone enlighten me ?
>
> This works:
>
>
> import std.range: ElementType, isInputRange;
>
> ElementType!R testFunc(R, T)(R range, T foo)
> if (is(ElementType!R == T)) {
> static assert(isInputRange!R);
> typeof(return) retVal = foo ^^ 2; // More DRY.
> return retVal;
> }
>
> void main() {
> auto values = [0.0, 3.0, -1.0, 5.0];
> auto result = testFunc(values, 8.8);
> }
>
>
> The D compiler seems unable to compute ElementType!R in the
> function signature. If I am right, then this seems worth an
> enhancement request.
>
> Bye,
> bearophile
thanks !...
... where you say 'More DRY' above, are you referring to
- foo^^2 ( I just did foo*foo for the sake of the example), or
- typeof(return) - a construct I am completely unfamiliar with and will
now have to look up !
If it is 'typeof(return)' why would this be selected over ElementType!R ??
Is it more idiomatic ?
regards,
ted
