[Issue 6573] Add isOneOf to std.traits

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=6573


bearophile_hugs at eml.cc changed:

           What    |Removed                     |Added
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                 CC|                            |bearophile_hugs at eml.cc


--- Comment #2 from bearophile_hugs at eml.cc 2011-08-30 01:51:23 PDT ---
Something like this? (A different recursion base):


template SameTypes(X, T...) {
    static if (T.length)
        enum bool SameTypes = is(X == T[0]) && SameTypes!(X, T[1 .. $]);
    else
        enum bool SameTypes = true;
}


void main() {
    static assert (!SameTypes!(int, int, int, double));
    static assert (!SameTypes!(double, int, int, int));
    static assert (SameTypes!(double));
    static assert (SameTypes!(int));
    static assert (SameTypes!(int, typeof(1)));
    static assert (SameTypes!(int, typeof(1), typeof(2)));
}

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