On Sat, 2017-07-29 at 00:43 +0200, Hans Åberg wrote: > The untyped C++ parser is fine, as far as I know. There is a calc++ > example in the distribution which shows how to use locations for > error reporting. The typed one may have a problem with the variants, > but perhaps that can be fixed with std::variant of C++17, the latter > which GCC supports, though there seems to be no developer right now.
Thanks Hans, but I reckon I'm too far down the bisonc++(1) rabbit hole
now.
I'm using bisonc++(1) 6.00.00. When I generate my parser and attempt to
compile it, I get a compiler warning for the second line of the
following method which appears to provide polymorphic support:
template <Tag__ tg_>
Semantic<tg_>::Semantic(Semantic<tg_> const &other)
:
d_data(other.d_data)
{
d_baseTag = other.d_baseTag;
}
warning: base class ‘class Meta__::Base’ should be explicitly
initialized in the copy constructor [-Wextra]
I can of course suppress this warning, but I'd rather not. What I don't
understand is what the warning concerns since the Base class
Semantic<tg_> derives from only has a default constructor:
class Base
{
protected:
Tag__ d_baseTag; // d_baseTag is assigned by Semantic.
public:
Base() = default;
Base(B ase const &other) = delete;
virtual ~Base();
Tag__ tag() const;
Base *clone() const;
void *data() const;
private:
virtual Base *vClone() const = 0;
virtual void *vData() const = 0;
};
--
Kip Warner | Senior Software Engineer
OpenPGP signed/encrypted mail preferred
http://www.thevertigo.com
signature.asc
Description: This is a digitally signed message part
_______________________________________________ help-bison@gnu.org https://lists.gnu.org/mailman/listinfo/help-bison
