[Issue 19475] add a staticIndexOf overload taking a pred

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19475

Simen Kjaeraas <simen.kjaras at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |simen.kjaras at gmail.com

--- Comment #1 from Simen Kjaeraas <simen.kjaras at gmail.com> ---
This can be trivially done as a combination of existing templates:

import std.meta;

enum predStaticIndexOf(alias Fn, T...) = staticIndexOf!(true, staticMap!(Fn,
T));

template MoreThan2(T...) {
    enum MoreThan2 = T[0] > 2;
}

unittest {
    static assert(predStaticIndexOf!(MoreThan2, 1,2,3) == 2);
}

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