Question on WeakPtr
Posted: Thu Jul 20, 2017 8:55 am
Related to below the example, in cef_weak_ptr.h, of WeakPtr use,
controller is a WeakPtr, is it possible that controller_ is invalidate on point 2., and if not why?
//1. if (controller_)
//2.
// 3. controller_->WorkComplete(result);
class Controller {
// public:
// Controller() : weak_factory_(this) {}
// void SpawnWorker() { Worker::StartNew(weak_factory_.GetWeakPtr()); }
// void WorkComplete(const Result& result) { ... }
// private:
// // Member variables should appear before the WeakPtrFactory, to ensure
// // that any WeakPtrs to Controller are invalidated before its members
// // variable's destructors are executed, rendering them invalid.
// WeakPtrFactory<Controller> weak_factory_;
// };
//
// class Worker {
// public:
// static void StartNew(const WeakPtr<Controller>& controller) {
// Worker* worker = new Worker(controller);
// // Kick off asynchronous processing...
// }
// private:
// Worker(const WeakPtr<Controller>& controller)
// : controller_(controller) {}
// void DidCompleteAsynchronousProcessing(const Result& result) {
// if (controller_)
// controller_->WorkComplete(result);
// }
// WeakPtr<Controller> controller_;
// };
controller is a WeakPtr, is it possible that controller_ is invalidate on point 2., and if not why?
//1. if (controller_)
//2.
// 3. controller_->WorkComplete(result);
class Controller {
// public:
// Controller() : weak_factory_(this) {}
// void SpawnWorker() { Worker::StartNew(weak_factory_.GetWeakPtr()); }
// void WorkComplete(const Result& result) { ... }
// private:
// // Member variables should appear before the WeakPtrFactory, to ensure
// // that any WeakPtrs to Controller are invalidated before its members
// // variable's destructors are executed, rendering them invalid.
// WeakPtrFactory<Controller> weak_factory_;
// };
//
// class Worker {
// public:
// static void StartNew(const WeakPtr<Controller>& controller) {
// Worker* worker = new Worker(controller);
// // Kick off asynchronous processing...
// }
// private:
// Worker(const WeakPtr<Controller>& controller)
// : controller_(controller) {}
// void DidCompleteAsynchronousProcessing(const Result& result) {
// if (controller_)
// controller_->WorkComplete(result);
// }
// WeakPtr<Controller> controller_;
// };