Diff: FunctionPointer.h

Revision:

0:8024c367e29f

Child:

7:73c5efe92a6c

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/FunctionPointer.h	Fri Oct 05 09:16:41 2012 +0000
@@ -0,0 +1,86 @@
+/* mbed Microcontroller Library - FunctionPointer
+ * Copyright (c) 2007-2009 ARM Limited. All rights reserved.
+ */ 
+ 
+#ifndef MBED_FUNCTIONPOINTER_H
+#define MBED_FUNCTIONPOINTER_H
+
+#include <string.h>
+
+namespace mbed { 
+
+/* Class FunctionPointer
+ *  A class for storing and calling a pointer to a static or member void function
+ */
+class FunctionPointer {
+
+public:
+
+    /* Constructor FunctionPointer
+     *  Create a FunctionPointer, attaching a static function
+     * 
+     * Variables
+     *  function - The void static function to attach (default is none)
+     */
+    FunctionPointer(void (*function)(void) = 0);
+
+    /* Constructor FunctionPointer
+     *  Create a FunctionPointer, attaching a member function
+     * 
+     * Variables
+     *  object - The object pointer to invoke the member function on (i.e. the this pointer)
+     *  function - The address of the void member function to attach 
+     */
+    template<typename T>    
+    FunctionPointer(T *object, void (T::*member)(void)) {
+        attach(object, member);
+    }
+
+    /* Function attach
+     *  Attach a static function
+     * 
+     * Variables
+     *  function - The void static function to attach (default is none)
+     */
+    void attach(void (*function)(void) = 0);
+    
+    /* Function attach
+     *  Attach a member function
+     * 
+     * Variables
+     *  object - The object pointer to invoke the member function on (i.e. the this pointer)
+     *  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;
+    }
+
+    /* Function call
+     *  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