[boost] Re: Reflection

From: John Torjo (john.lists_at_[hidden])
Date: 2004-11-12 14:30:18

> 
> I do apologize if this is all plainly obvious to some people, but I'm
> having difficulty getting it through my thick skull.
> 

// simple example

struct property_holder_base {
    virtual ~property_holder_base() {}
};

template<class m_class, class m_type>
struct get_member_property_holder {
   typedef ... func;
   get_member_propert_holder(func f) : f(f) {}
   func f;
};
template<class m_class, class m_type>
struct set_member_property_holder {
   typedef ... func;
   set_member_propert_holder(func f) : f(f) {}
   func f;
};

struct reflected_property {
   // templated constructor
   template<class m_class, class m_type>
   reflected_property(
     m_type (m_class::*getter)() const,
     void (m_class::*setter)(m_type),
     const std::string & name) {
    s_getters[name] = ptr(new ...(getter));
    s_setters[name] = ptr(new ...(setter));
}

   typedef boost::shared_ptr<property_holder_base> ptr;
   static std::map<std::string,ptr> s_getters;
   static std::map<std::string,ptr> s_setters;
};

struct window {
   bool is_enabled() const;
   void enable(bool);
};

// define a global static

namespace {
   reflected_property 
r(&window::is_enabled,&window::enable,"window::enabled");
}

Best,
John

-- 
John Torjo,    Contributing editor, C/C++ Users Journal
-- "Win32 GUI Generics" -- generics & GUI do mix, after all
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