"cannot deduce function from argument types" issue.

[bearophile via Digitalmars-d-learn]

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