Diff: cpp/FunctionPointer.h

Revision:

0:fd0d7bdfcdc2

Child:

2:143cac498751

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/cpp/FunctionPointer.h	Tue Nov 20 17:24:08 2012 +0000
@@ -0,0 +1,90 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2012 ARM Limited
+ *
+ * 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 MBED_FUNCTIONPOINTER_H
+#define MBED_FUNCTIONPOINTER_H
+
+#include <string.h>
+
+namespace mbed { 
+
+/** A class for storing and calling a pointer to a static or member void function
+ */
+class FunctionPointer {
+public:
+
+    /** Create a FunctionPointer, attaching a static function
+     * 
+     *  @param function The void static function to attach (default is none)
+     */
+    FunctionPointer(void (*function)(void) = 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>
+    FunctionPointer(T *object, void (T::*member)(void)) {
+        attach(object, member);
+    }
+    
+    /** Attach a static function
+     * 
+     *  @param function The void static function to attach (default is none)
+     */
+    void attach(void (*function)(void) = 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)(void)) {
+        _object = static_cast<void*>(object);
+        memcpy(_member, (char*)&member, sizeof(member));
+        _membercaller = &FunctionPointer::membercaller<T>;
+        _function = 0;
+    }
+    
+    /** Call the attached static or member function
+     */
+    void call();
+
+private:
+    template<typename T>
+    static void membercaller(void *object, char *member) {
+        T* o = static_cast<T*>(object);
+        void (T::*m)(void);
+        memcpy((char*)&m, member, sizeof(m));
+        (o->*m)();
+    }
+    
+    void (*_function)(void);                // 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*);    // registered membercaller function to convert back and call _member on _object
+};
+
+} // namespace mbed
+
+#endif