Re: x3::variant vs boost::variant

On 2/18/16 4:48 AM, Baptiste Wicht wrote:

> The main problem that remains is with x3::variant and x3::forward_ast:
>
> I have a type like this:
>
>      using Type = boost::spirit::x3::variant<
>              SimpleType,
>              boost::spirit::x3::forward_ast<ArrayType>,
>              boost::spirit::x3::forward_ast<TemplateType>,
>              boost::spirit::x3::forward_ast<PointerType>
>          >;
>
> And a lot of code resembling this:
>
>      if(auto* ptr = boost::get<ast::SimpleType>(&type)){
>          //Do something on *ptr
>      } else if(auto* ptr = boost::get<ast::ArrayType>(&type)){
>          //Do something on *ptr
>      } else if(auto* ptr = boost::get<ast::PointerType>(&type)){
>          //...
>      }
>      //...
>
> But this does not work since ArrayType is not a member of the variant
> because of the forward_ast and I have an error from boost strict_get.
>
> I really have a lot of code like this, I won't be able (neither have the
> motivation for it) to change all of it. If there is no simple solution,
> I'll use my old AST with boost::variant and recursive_wrapper.
>
> Is there anything I can do to use boost::get with forward_ast ?

There should be a solution. tell you what. Give me a minimal test
case and I can work on getting it compile and run as expected.

Regards,
-- 
Joel de Guzman
http://www.ciere.com
http://boost-spirit.com
http://www.cycfi.com/


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