MetaSeq

module meta.seq;

public import std.meta;

bool Contains (alias Elem, Seq...)() {
    return staticIndexOf!(Elem, Seq) >= 0;
}

template ApplyContains (Seq...) {
    template Applied (alias Elem) {
        alias Applied = Contains!(Elem, Seq);
    }
}

template Intersect (Left...) {
    template To (Right...) {
        alias To = Filter!(ApplyContains!(Right).Applied, Left);
    }
}

template Difference (Left...) {
    template To (Right...) {
        alias To = Filter!(templateNot!(ApplyContains!(Right).Applied), Left);
    }
}