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+// ObjectResource.hh for Fluxbox
+// Copyright (c) 2007 Henrik Kinnunen (fluxgen at fluxbox dot org)
+//                and Simon Bowden    (rathnor at users.sourceforge.net)
+// 
+// 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.
+
+// $Id$
+
+#ifndef OBJECTRESOURCE_HH
+#define OBJECTRESOURCE_HH
+
+/* This is a generic resource that can be used as an accessor to a value in an object.
+   The constructors allow to select between:
+     1a. giving an object of ObjectType, OR
+     1b. giving a function returning an object of ObjectType
+
+     2a. a function that sets a value
+     2b. a function that toggles a value 
+ */
+
+template <typename ObjectType, typename ValueType>
+class ObjectResource {
+public:
+    typedef ValueType (ObjectType::* getResourceType)() const;
+    typedef void (ObjectType::* setResourceType)(ValueType);
+    typedef void (ObjectType::* toggleResourceType)();
+    typedef ObjectType* (*getResourceObject)();
+
+    ObjectResource(ObjectType *object, getResourceType get, setResourceType set, ValueType a_default) :
+        m_get(get), m_set(set), m_istoggle(false), m_object(object), 
+        m_default(a_default), m_use_accessor(false) {
+    }
+
+    ObjectResource(ObjectType *object, getResourceType get, toggleResourceType toggle, ValueType a_default) :
+        m_get(get), m_toggle(toggle), m_istoggle(true), m_object(object),
+        m_default(a_default), m_use_accessor(false) {
+    }
+
+    ObjectResource(getResourceObject object_accessor, getResourceType get, setResourceType set, ValueType a_default) :
+        m_get(get), m_set(set), m_istoggle(false), m_object_accessor(object_accessor),
+        m_default(a_default), m_use_accessor(true) {
+    }
+
+    ObjectResource(getResourceObject object_accessor, getResourceType get, toggleResourceType toggle, ValueType a_default) :
+        m_get(get), m_toggle(toggle), m_istoggle(true), m_object_accessor(object_accessor),
+        m_default(a_default), m_use_accessor(true) {
+    }
+    
+    ObjectResource<ObjectType, ValueType>& operator = (const ValueType newvalue) {
+        ObjectType * obj = getObject();
+        if (!obj)
+            return *this;
+
+        if (m_istoggle) {
+            if (newvalue != (operator*)())
+                (obj->*m_toggle)();
+        } else {
+            (obj->*m_set)(newvalue);
+        }
+        return *this;
+    }
+
+    ObjectResource<ObjectType, ValueType>& operator += (const ValueType newvalue) {
+        ObjectType * obj = getObject();
+        if (obj && !m_istoggle)
+            (obj->*m_set)((operator*)()+newvalue);
+        return *this;
+    }
+
+    ObjectResource<ObjectType, ValueType>& operator -= (const ValueType newvalue) {
+        ObjectType * obj = getObject();
+        if (obj && !m_istoggle)
+            (obj->*m_set)((operator*)()-newvalue);
+        return *this;
+    }
+
+    // this is a touch dirty, but it makes us compatible with FbTk::Resource<int> in IntResMenuItem 
+    ObjectResource<ObjectType, ValueType>& get() {
+        return *this;
+    }
+
+    ValueType operator*() {
+        ObjectType * obj = getObject();
+        if (!obj)
+            return m_default;
+
+        return (obj->*m_get)();
+    }
+
+    const ValueType operator*() const {
+        ObjectType * obj = getObject();
+        if (!obj)
+            return m_default;
+
+        return (obj->*m_get)();
+    }
+
+private:
+    // choose one get and one set function
+
+    ObjectType * getObject() {
+        if (m_use_accessor) 
+            return (*m_object_accessor)();
+        else
+            return m_object;
+    }
+
+    getResourceType m_get;
+
+    union {
+        setResourceType m_set;
+        toggleResourceType m_toggle;
+    };
+
+    bool m_istoggle;
+
+    union {
+        ObjectType *m_object;
+        getResourceObject m_object_accessor;
+    };
+
+    // default is only used when object isn't set (saves crashes)
+    ValueType m_default; 
+
+    bool m_use_accessor;
+};
+
+
+#endif // OBJECTRESOURCE_HH