callback

问题 How do I setup/register a callback function, in C++, to call a function when there is data to be read from a queue? Edit 1: Using Neil's answer for a complete answer (in header file): #include <vector.h> class QueueListener { public: virtual void DataReady(class MyQueue *q) = 0; virtual ~QueueListener() {} }; class MyQueue { public: void Add (int x) { theQueue.push_back(x); for (int i = 0; i < theCallBacks.size(); i++) { theCallBacks[i]->DataReady(this); } } void Register (QueueListener *ql)

问题 In below code snippet while calling call back function "Invalid use of void expression" error is flashed by the compiler. #include <iostream> #include <functional> using namespace std; template<class type> class State { public: State(type type1,const std::function<void (type type1 )> Callback) { } }; template <class type> void Callback(type type1 ) { //Based on type validation will be done here } int main() { State<int> obj(10,Callback(10)); return 0; } Just want to know what is the wrong

问题 I'm designing a method for an input handler class. Here is some pseudo code... void InputHandler::ScanEvents( boost::function1< void, std::string& > &func ) { // Scan keys, determining string to pass // If string found, call func with string as its argument on object tied to func } I'm not exactly sure how to implement this, or if it is even possible, since the whole point of a function is to separate it from its caller. The idea is that an object has a private member function and a boost:

问题 I'm designing a method for an input handler class. Here is some pseudo code... void InputHandler::ScanEvents( boost::function1< void, std::string& > &func ) { // Scan keys, determining string to pass // If string found, call func with string as its argument on object tied to func } I'm not exactly sure how to implement this, or if it is even possible, since the whole point of a function is to separate it from its caller. The idea is that an object has a private member function and a boost:

问题 I am using javascript alert library sweetalert My code is: function foo(id) { swal({ title: "Are you sure?", text: "You will not be able to recover this imaginary file!", type: "warning", showCancelButton: true, confirmButtonColor: "#DD6B55", confirmButtonText: "Yes, delete it!", closeOnConfirm: false }, function(){ swal("Deleted!", "Your imaginary file has been deleted.", "success"); }); } How can I pass id from foo() function to callback function in swal? 回答1: function(id){ alert(MyId);

问题 I am using javascript alert library sweetalert My code is: function foo(id) { swal({ title: "Are you sure?", text: "You will not be able to recover this imaginary file!", type: "warning", showCancelButton: true, confirmButtonColor: "#DD6B55", confirmButtonText: "Yes, delete it!", closeOnConfirm: false }, function(){ swal("Deleted!", "Your imaginary file has been deleted.", "success"); }); } How can I pass id from foo() function to callback function in swal? 回答1: function(id){ alert(MyId);

问题 [EDIT - Disclaimer: This is a really bad idea, see the accepted answer for an actual solution.] I define my own exception handler using set_exception_handler() function. After the handler execution, I need the script to continue. Is there any way to do it? Disclaimer: I know try-catch blocks but I need to process Exceptions dynamicaly. Every calling of Clazz::foo() specifies its own exceptions which should be caught by my handler. That's the reason I can't use it. Example: class Clazz {

问题 I decided to switch from keras to tf.keras (as recommended here). Therefore I installed tf.__version__=2.0.0 and tf.keras.__version__=2.2.4-tf . In an older version of my code (using some older Tensorflow version tf.__version__=1.x.x ) I used a callback to compute custom metrics on the entire validation data at the end of each epoch. The idea to do so was taken from here. However, it seems as if the "validation_data" attribute is deprecated so that the following code is not working any longer

问题 I have the following code which defines a Car . Each Car has a color, along with a setColor(color) function. I want to add listener functions which are called whenever setColor(color) is called, and I want to be able to tack these listener functions on whenever I want. Is this a suitable approach? Is there a cleaner way? function Car() { this._color = 'red'; this._callbacks = {}; this.setColor = function(color) { this._color = color; console.log(">>> set car color to " + color); if (this.

问题 USB thumb drives USB harddisks USB DVD writer USB Bluetooth devices USB headsets usb mouse USB keyboard USB webcams / cameras Just want to detect any sort of usb device using event handler... Would appreciate any help... WqlEventQuery q_creation = new WqlEventQuery(); private void Form2_Load(object sender, EventArgs e) { q_creation.EventClassName = "__InstanceCreationEvent"; q_creation.WithinInterval = new TimeSpan(0, 0, 2); //How often do you want to check it? 2Sec. q_creation.Condition = @