Hi @Hans, thanks a lot!
Could you explain more on "reference count" ? do you mean std::shared_ptr? min On Thu, Aug 18, 2016 at 12:21 PM, Hans Åberg <haber...@telia.com> wrote: > > > On 18 Aug 2016, at 18:07, Min Wang <mingew...@gmail.com> wrote: > > > (1) when ListExp was returned up to PROG (e.g: PROG($1)), does it use > copy > > constructor? or > > use move constructor if it existed? > > A part from translation of the $-variables, the action code is copied > verbatim to the C++ parser. So do not think move constructors are invoked, > since that happens in special syntactic context where it is known that a > variable will perish. > > > (2) should I use object ( ListExp) inside PROG class or a > > std::unique_ptr inside the PROG to save some copy ? In the latter case, > > how can I initial std::unique_ptr if the passed parameters if a obj? > > Don’t use that, because in some cases there may be an implicit $$ = $1, > which might make it obsolete. Instead use a reference count or a GC, like > the Hans Boehm one: > http://www.hboehm.info/gc/ > > > -- http://www.comrite.com _______________________________________________ help-bison@gnu.org https://lists.gnu.org/mailman/listinfo/help-bison
