rvalue based copy

[anonymous via Digitalmars-d-learn]

On Monday, 30 March 2015 at 17:21:53 UTC, Steven Schveighoffer 
wrote:
> One solution is to overload
>
> void opAssign(ref const S s) {...}
> void opAssign(const S s) {...}
>
> lvalues will go into the ref version, rvalues into the non-ref. 
> There won't be any copying of data, so you still save a 
> postblit and copying on the stack.
>
> But you have to repeat the implementation.

You can call the ref version from the non-ref version:

void opAssign(ref const S s) {...}
void opAssign(const S s) {opAssign(s); /* calls the ref version 
*/}

Of course, only do this when the ref version doesn't store &s.