Diff: EwFunctionPointer.h

Revision:

0:316c181e9b65

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/EwFunctionPointer.h	Mon Dec 16 07:03:22 2013 +0000
@@ -0,0 +1,90 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2013 ARM Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#ifndef EWFUNCTIONPOINTER_H
+#define EWFUNCTIONPOINTER_H
+
+#include <string.h>
+#include <stdint.h>
+#include "EwWindow.h"
+
+
+
+
+/** A class for storing and calling a pointer to a static or member void function
+ */
+class EwFunctionPointer {
+public:
+
+    /** Create a FunctionPointer, attaching a static function
+     *
+     *  @param function The void static function to attach (default is none)
+     */
+    EwFunctionPointer(void (*function)(EwWindow* w) = 0);
+
+    /** Create a FunctionPointer, attaching a member function
+     *
+     *  @param object The object pointer to invoke the member function on (i.e. the this pointer)
+     *  @param function The address of the void member function to attach
+     */
+    template<typename T>
+    EwFunctionPointer(T *object, void (T::*member)(EwWindow* w)) {
+        attach(object, member);
+    }
+
+    /** Attach a static function
+     *
+     *  @param function The void static function to attach (default is none)
+     */
+    void attach(void (*function)(EwWindow* w) = 0);
+
+    /** Attach a member function
+     *
+     *  @param object The object pointer to invoke the member function on (i.e. the this pointer)
+     *  @param function The address of the void member function to attach
+     */
+    template<typename T>
+    void attach(T *object, void (T::*member)(EwWindow* w)) {
+        _object = static_cast<void*>(object);
+        memcpy(_member, (char*)&member, sizeof(member));
+        _membercaller = &EwFunctionPointer::membercaller<T>;
+        _function = 0;
+    }
+
+    /** Call the attached static or member function
+     */
+    void call(EwWindow* w);
+
+
+
+
+private:
+    template<typename T>
+    static void membercaller(void *object, char *member, EwWindow* w) {
+        T* o = static_cast<T*>(object);
+        void (T::*m)(EwWindow* w);
+        memcpy((char*)&m, member, sizeof(m));
+        (o->*m)(w);
+    }
+
+    void (*_function)(EwWindow* w);                // static function pointer - 0 if none attached
+    void *_object;                            // object this pointer - 0 if none attached
+    char _member[16];                        // raw member function pointer storage - converted back by registered _membercaller
+    void (*_membercaller)(void*, char*, EwWindow* w);    // registered membercaller function to convert back and call _member on _object
+};
+
+
+
+#endif