On Monday, 30 March 2015 at 17:09:14 UTC, matovitch wrote:
(I am gessing ref argument explitly means no rvalue)

That's right. I'd first say don't use ref, just use "const S" and it will work and probably do what you need efficiently.

If you do want it to be ref though, rvalues aren't allowed unless you make it "auto ref" which needs to be a template:

// this will work, second set of () makes it a template
// then auto ref makes it use ref for lvalues and non-ref for rvalues
// automatially
    void opAssign()(const auto ref S s)
    {
        //...
    }

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