From cbb8e474bb5592753a340ba31d3afbab7226f7c6 Mon Sep 17 00:00:00 2001
From: Josh Blum <josh@joshknows.com>
Date: Tue, 12 Jan 2010 14:43:43 -0800
Subject: Reorganized structure into include, lib, test, firmware, fpga. The
 fpga and firmware are empty placeholders for now.

---
 include/usrp_uhd/wax.hpp | 129 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 129 insertions(+)
 create mode 100644 include/usrp_uhd/wax.hpp

(limited to 'include/usrp_uhd/wax.hpp')

diff --git a/include/usrp_uhd/wax.hpp b/include/usrp_uhd/wax.hpp
new file mode 100644
index 000000000..9d32314f7
--- /dev/null
+++ b/include/usrp_uhd/wax.hpp
@@ -0,0 +1,129 @@
+//
+// 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 */
-- 
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