BLE::init() should also be able to take a <object,member> tuple.

ble/BLE.h

@@ -41,16 +41,28 @@ public:
     typedef unsigned InstanceID_t; /** The type returned by BLE::getInstanceID(). */
 
     /**
-     * The function signature for callbacks for initialization completion.
+     * The context provided to init-completion-callbacks (see init() below).
+     *
      * @param  ble
      *             A reference to the BLE instance being initialized.
      * @param  error
      *             This captures the result of initialization. It is set to
      *             BLE_ERROR_NONE if initialization completed successfully. Else
      *             the error value is implementation specific.
+     */
+    struct InitializationCompleteCallbackContext {
+        BLE&        ble;   /* Reference to the BLE object which has been initialized */
+        ble_error_t error; /* Error status of the initialization. It is set to BLE_ERROR_NONE initialization completed successfully. */
+    };
+
+    /**
+     * The signature for function-pointer like callbacks for initialization-completion.
      *
+     * @note There are two versions of init(). In addition to the simple
+     *     function-pointer, init() can also take a <Object, member> tuple as its
+     *     callback target. In case of the latter, the following declaration doesn't apply.
      */
-    typedef void (*InitializationCompleteCallback_t)(BLE &ble, ble_error_t error);
+    typedef void (*InitializationCompleteCallback_t)(InitializationCompleteCallbackContext *context);
 
     /**
      * Initialize the BLE controller. This should be called before using
@@ -72,18 +84,31 @@ public:
      * @return  BLE_ERROR_NONE if the initialization procedure was started
      *     successfully.
      *
-     * @note The underlying stack must invoke the initialization completion
-     *     callback in response to init(). In some cases, initialization is
-     *     instantaneous (or blocking); if so, it is acceptable for the stack-
-     *     specific implementation of init() to invoke the completion callback
-     *     directly--i.e. within its own context.
+     * @note If init() returns BLE_ERROR_NONE, the underlying stack must invoke
+     *     the initialization completion callback at some point.
+     *
+     * @note In some cases, initialization is instantaneous (or blocking); if
+     *     so, it is acceptable for the stack-specific implementation of init()
+     *     to invoke the completion callback directly--i.e. within its own
+     *     context.
      *
      * @note Nearly all BLE APIs would return
      *     BLE_ERROR_INITIALIZATION_INCOMPLETE if used on an instance before the
      *     corresponding transport is initialized.
+     *
+     * @note There are two versions of init(). In addition to the simple
+     *     function-pointer, init() can also take an <Object, member> tuple as its
+     *     callback target.
      */
     ble_error_t init(InitializationCompleteCallback_t callback = NULL);
 
+    /**
+     * An alternate declaration for init(). This one takes an <Object, member> tuple as its
+     * callback target.
+     */
+    template<typename T>
+    ble_error_t init(T *object, void (T::*initCompleteCallback)(InitializationCompleteCallbackContext *context));
+
     /**
      * @return true if initialization has completed for the underlying BLE
      *     transport.

ble/BLEInstanceBase.h

@@ -32,7 +32,8 @@ class GattClient;
 class BLEInstanceBase
 {
 public:
-    virtual ble_error_t            init(BLE::InstanceID_t instanceID, BLE::InitializationCompleteCallback_t) = 0;
+    virtual ble_error_t            init(BLE::InstanceID_t instanceID,
+                                        FunctionPointerWithContext<BLE::InitializationCompleteCallbackContext *> initCallback) = 0;
     virtual bool                   hasInitialized(void) const = 0;
     virtual ble_error_t            shutdown(void)             = 0;
     virtual const char *           getVersion(void)           = 0;

source/BLE.cpp

@@ -22,8 +22,28 @@
 #endif
 
 ble_error_t
-BLE::init(BLE::InitializationCompleteCallback_t callback)
+BLE::init(BLE::InitializationCompleteCallback_t initCompleteCallback)
 {
+    FunctionPointerWithContext<InitializationCompleteCallbackContext *>callback(initCompleteCallback);
+    ble_error_t err = transport->init(instanceID, callback);
+    if (err != BLE_ERROR_NONE) {
+        return err;
+    }
+
+    /* Platforms enabled for DFU should introduce the DFU Service into
+     * applications automatically. */
+#if defined(TARGET_OTA_ENABLED)
+    static DFUService dfu(*this); // defined static so that the object remains alive
+#endif // TARGET_OTA_ENABLED
+
+    return BLE_ERROR_NONE;
+}
+
+template <typename T>
+ble_error_t
+BLE::init(T *object, void (T::*initCompleteCallback)(InitializationCompleteCallbackContext *))
+{
+    FunctionPointerWithContext<InitializationCompleteCallbackContext *>callback(object, initCompleteCallback);
     ble_error_t err = transport->init(instanceID, callback);
     if (err != BLE_ERROR_NONE) {
         return err;