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Re: Automatially move from $n (was: C++11 move semantics)

From: Hans Åberg
Subject: Re: Automatially move from $n (was: C++11 move semantics)
Date: Sun, 1 Apr 2018 23:33:09 +0200

> On 1 Apr 2018, at 23:13, Frank Heckenbach <address@hidden> wrote:
> Hans Åberg wrote:
>> An advantage with operators names is avoiding parentheses, but a
>> problem is that they are hard to search for, but here, since they
>> will always together with the $k, that should not be a problem.
>> Candidate names might be operator * & ~ + -.
> As I said, I'm not really fond of (mis)using operators like that.
> Of course, you (or anyone else) might disagree and do it like that,
> Bison neither encourages nor prevents it.
> My "%define" proposal is an alternative (also completely optional;
> if you don't set it, it won't do anything). I think it's a bit
> easier to use and more general -- it will apply to all types
> (including primitive types, where moving is the same as copying, so
> effectively no change for them), whereas you'd have to define the
> overloaded operator for each relevant type (and couldn't blindly
> define it for all types as it already has a meaning for some of
> them). Do you have any objections to my "%define" proposal?

It any future Bison developer that decides what to integrate. Otherwise, I 
think it is OK to be able to choose wrap around $k, but potentially unsafe to 
always have implicit std::move without pitfall checks. 

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