Re: Linking error when changing > to >>

On 11/20/2016 12:21 PM, Exagon wrote:
> Besids the linking errors when switch from > to >> in this example, I am
> getting a lot of linker errors, when I try to use boost::optional as a
> member of an attribute
>
> for example when I change
>
> auto const var_dec_def = x3::lexeme["var "]
>                          > +x3::alnum
>                          > ":"
>                          > type
>                          > ";";
>
> to
>
> auto const var_dec_def = x3::lexeme["var "]
>                          > +x3::alnum
>                          > ":"
>                          > -type //type is now optional
>                          > ";";
>
> and dont change something in the ast, it compiles fine, but when I change
>
> struct VariableDec {
>     std::string _name;
>     Type _type;
> };
>
> to
>
> struct VariableDec {
>     std::string _name;
>     boost::optional<Type> _type;
> };
>
> I am getting a linking error again.
> Is this a bug or am I doing soemthing stupid?
> If this is a totaly different topic, I will invest some time and create
> another repo with a more minimal example to show my problem with this.
>
> Greetings Exagon

Try the latest update here:

https://github.com/cppljevans/spirit/blob/ExagonLinkingError/include/boost/spirit/home/x3/nonterminal/rule.hpp

Unfortunately, I've no idea how many more extract_rule_attr overloads
may be needed to handle all situations.  I don't even know if the
use of extract_rule_attr overloads is correct (it may handle the
attributes differently than "standard" boost).  I'm still trying
to understand how attributes are handled in boost code. I can read
the user documentation; however, I still need to read the code
to see how it's done, and that's taking a while :(

If you have another similar problem, try to figure out another
extract_rule_attr to handle it.  Otherwise, maybe Seth or Joel
would have a better idea how to handle this.

-regards,
Larry




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