Re: Please add support for non-copiable but movable types to C++ parser

[Akim Demaille]

> Le 1 mars 2015 à 10:36, Askar Safin <address@hidden> a écrit :
> 
> Please, add support for non-copiable, but movable (I mean C++11 moving 
> construstors and moving operator=) semantic values to C++ parser (to %define 
> api.value.type variant, of course).
> 
> For example, it is very useful to have the following semantic type for 
> expressions like 2 + 3 - 4:
> class expr
> {
> public:
>  enum class kind {num, plus, minus};
>  kind k;
>  int num;
>  std::unique_ptr<expr> a;
>  std::unique_ptr<expr> b;
> };
> 
> But, unfortunately, unique_ptr member makes this types non-copiable, so 
> currently this class cannot be used as semantic value.
> (CC me if you want to answer)

This would be very useful, indeed.  Hans Haberg has already
provided hints on how this should be coded.  I don't have
enough time right now to do it properly.  You might want to
have a look at Hans' work.

http://lists.gnu.org/archive/html/bug-bison/2015-01/msg00066.html