architecture astronomy

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diff --git a/src/FbTk/Accessor.hh b/src/FbTk/Accessor.hh
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+// Accessor.hh
+// Copyright (c) 2007 Fluxbox Team (fluxgen at fluxbox dot org)
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the "Software"),
+// to deal in the Software without restriction, including without limitation
+// the rights to use, copy, modify, merge, publish, distribute, sublicense,
+// and/or sell copies of the Software, and to permit persons to whom the
+// Software is furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+// DEALINGS IN THE SOFTWARE.
+
+#ifndef FBTK_ACCESSOR_HH
+#define FBTK_ACCESSOR_HH
+
+namespace FbTk {
+
+// base class for objects that act like data type T
+template <typename T>
+class Accessor {
+public:
+    virtual Accessor<T> &operator =(const T &val) = 0;
+    virtual operator T() const = 0;
+};
+
+// essentially just a reference
+template <typename T>
+class SimpleAccessor: public Accessor<T> {
+public:
+    SimpleAccessor(T &val): m_val(val) { }
+    inline Accessor<T> &operator =(const T &val) { m_val = val; return *this; }
+    inline operator T() const { return m_val; }
+
+private:
+    T &m_val;
+};
+
+// use object methods as an accessor
+template <typename T, typename Receiver>
+class ObjectAccessor: public Accessor<T> {
+public:
+    typedef T (Receiver:: *Getter)() const;
+    typedef void (Receiver:: *Setter)(T &);
+    ObjectAccessor(Receiver &r, Getter g, Setter s):
+        m_receiver(r), m_getter(g), m_setter(s) { }
+
+    inline operator T() const { return (m_receiver.*m_getter)(); }
+    inline Accessor<T> &operator =(const T &val) {
+        (m_receiver.*m_setter)(val); return *this;
+    }
+
+private:
+    Receiver &m_receiver;
+    Getter m_getter;
+    Setter m_setter;
+};
+
+// same as above but with no set method
+template <typename T, typename Receiver>
+class ConstObjectAccessor: public Accessor<T> {
+public:
+    typedef T (Receiver:: *Getter)() const;
+    ConstObjectAccessor(const Receiver &r, Getter g):
+        m_receiver(r), m_getter(g) { }
+
+    inline operator T() const { return (m_receiver.*m_getter)(); }
+    inline Accessor<T> &operator =(const T &val) { return *this; }
+
+private:
+    const Receiver &m_receiver;
+    Getter m_getter;
+};
+
+}; // end namespace FbTk
+
+#endif // FBTK_ACCESSOR_HH