Diff: api/FunctionPointer.h

Revision:

9:0ce32e54c9a7

Parent:

2:143cac498751

Child:

10:3bc89ef62ce7

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/api/FunctionPointer.h	Mon Jun 10 16:03:00 2013 +0100
@@ -0,0 +1,84 @@
+/* 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 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