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+//
+// Copyright 2010 Ettus Research LLC
+//
+
+#ifndef INCLUDED_WAX_HPP
+#define INCLUDED_WAX_HPP
+
+#include <boost/any.hpp>
+#include <boost/function.hpp>
+#include <boost/shared_ptr.hpp>
+#include <boost/weak_ptr.hpp>
+#include <boost/pointer_cast.hpp>
+#include <iostream>
+
+/*!
+ * WAX - it's a metaphor!
+ *
+ * The WAX framework allows object to have generic/anytype properties.
+ * These properties can be addressed through generic/anytype identifiers.
+ * A property of a WAX object may even be another WAX object.
+ *
+ * When a property is a WAX object, the returned value must be an obj pointer.
+ * A WAX object provides two types of pointers: obj::ptr and obj::sptr.
+ * The choice of pointer vs smart pointer depends on the owner of the memory.
+ *
+ * Proprties may be referenced though the [] overloaded operator.
+ * The [] operator returns a special proxy that allows for assigment.
+ * Also, the [] operators may be chained as in the folowing examples:
+ * my_obj[prop1][prop2][prop3] = value
+ * value = my_obj[prop1][prop2][prop3]
+ *
+ * Any value returned from an access operation is of wax::type.
+ * To use this value, it must be cast with wax::cast<new_type>(value).
+ */
+
+namespace wax{
+
+ //general typedefs
+ typedef boost::any type;
+ typedef boost::bad_any_cast bad_cast;
+
+ //dummy class declarations
+ class obj; class proxy;
+
+ /*!
+ * WAX object base class:
+ * A wax object subclass should override the set and get methods.
+ * The magic of operator chaining is handled by the [] operator.
+ */
+ class obj{
+ public:
+ //obj pointer typedefs
+ typedef boost::shared_ptr<obj> sptr;
+ typedef obj* ptr;
+
+ //cast derived pointer to obj base class pointer
+ template <class T> static sptr cast(boost::shared_ptr<T> r){
+ return boost::static_pointer_cast<obj>(r);
+ }
+ template <class T> static ptr cast(T *r){
+ return dynamic_cast<ptr>(r);
+ }
+
+ //structors
+ obj(void);
+ virtual ~obj(void);
+
+ //public interface
+ proxy operator[](const type &key);
+
+ private:
+ //private interface
+ virtual void get(const type &key, type &val) = 0;
+ virtual void set(const type &key, const type &val) = 0;
+ };
+
+ /*!
+ * WAX proxy class:
+ * Allows the obj [] operator to return a proxy result.
+ * This result can be assigned to via the = operator.
+ * Or this result can be called again with the [] operator.
+ */
+ class proxy{
+ public:
+ //destructors
+ ~proxy(void);
+
+ //overloaded
+ type operator()(void);
+ proxy operator[](const type &key);
+ proxy operator=(const type &key);
+
+ private:
+ //typedefs for callables from the object that built this proxy
+ typedef boost::function<void(const type &)> setter_t;
+ typedef boost::function<void(type &)> getter_t;
+
+ //private contructor
+ proxy(getter_t, setter_t);
+ //access to private contructor
+ friend proxy obj::operator[](const type &key);
+
+ getter_t d_getter;
+ setter_t d_setter;
+ };
+
+ /*!
+ * Cast a wax::type into the desired type
+ * Usage wax::cast<new_type>(my_value).
+ *
+ * \param val the any type to cast
+ * \return data of the desired type
+ * \throw wax::bad_cast when the cast fails
+ */
+ template<typename T> T cast(const type & val){
+ //special case to handle the proxy
+ if (val.type() == typeid(proxy)){
+ return cast<T>(boost::any_cast<proxy>(val)());
+ }
+ //do the type cast
+ return boost::any_cast<T>(val);
+ }
+
+} //namespace wax
+
+//ability to use types with stream operators
+std::ostream& operator<<(std::ostream &os, const wax::type &x);
+
+#endif /* INCLUDED_WAX_HPP */