[xsd-users] Visitors (again?)

[Timothy Astle]

Thankyou very much! Great answer :)

Tim


On 09/09/2014 3:58 AM, Oliver Schneider wrote:
> Hi Tim,
>
> You can easily add a visit function to all your custom classes.
> look at
> http://wiki.codesynthesis.com/Tree/Customization_guide#Customizing_the_generated_type_.E2.80.94_the_complex_case
>
> Then add a void accept(Visitor& v) { v.visit(*this); } function.
>
> If you have c++11 you can even easily templatize this (can be done w/o
> c++11, but the inclusion of the template would be a mess)
> I created a Visitable template:
>
> template<template <class> class T, class base>
>      class Visitable : public base
>      {
>      public:
>          using base::base;
>          typedef T<base> Derived;
>          typedef Visitable<T, base> VisitableBase;
>          void accept(Visitor& visitor) { visitor.visit(*this); }
>          virtual base*
>              _clone(xml_schema::flags flags = 0,
>              xml_schema::container* container = 0) const override
>          {
>              return new Derived(static_cast<const Derived&>(*this),
> flags, container);
>          }
>          virtual ~Visitable() = default;
>      };
>
> I use this by instanciating the custom class this way:
>
> template<typename base>
> class Custom_impl : public Visitable<Custom_impl, base>
> {
> public:
>      using base::base;
> };
>
> Simple enough, and easily extendable
>
> greetings
>
> /oliver
>
> Am 04.09.2014 17:11, schrieb Timothy Astle:
>> I've checked the list archives aboutthis andseen a few related
>> threads, but I'd like to get a summary / update.  It seems like I'mnot
>> the first one interested in this topic.  Also keep in mind that I'm
>> new to this library, so please be kind.  :)
>>
>> Is there any means to generate sourcethat allows for visitors?
>> Similar to what we're adding to
>> <https://java.net/jira/browse/OGC-55>the OGC Sche
>> <https://java.net/jira/browse/OGC-55>mas in JAXB
>> <https://java.net/jira/browse/OGC-55>.
>>
>> There are situations where we'd like to take OGC Filters andtraverse
>> them to produce queries.
>>
>> If someone can point me in the right direction, it'd be much appreciated.
>>
>> Cheers,
>>
>> Tim
>>

-- 
Tim Astle
Development Manager
Web Technologies

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