dispatch

Is S4 method dispatch slow?

由 笑着哭i 提交于 2019-11-29 03:00:02
问题 My S4 class has a method that is called many times. I noticed that the execution time is much slower than it would be if a similar function was called independently. So I added a slot with type "function" to my class and used that function instead of the method. The example below shows two ways of doing this, and both of them run much faster than the corresponding method. Also, the example suggests that the lower speed of the method is not due to method having to retrieve data from the class,

Difference between func() and (*this).func() in C++

由 北战南征 提交于 2019-11-29 02:01:46
问题 I am working on someone else code in C++, and I found a weird call to a certain function func() . Here is an example: if(condition) func(); else (*this).func(); What is the difference between func() and (*this).func() ? What are the cases where the call to func() and (*this).func() will execute different code? In my case, func() is not a macro. It is a virtual function in the base class, with an implementation in both base and derived class, and no free func() . The if is located in a method

Stop dispatch_after

由 一个人想着一个人 提交于 2019-11-28 22:14:59
问题 I use an animation for specify a tip to help the interaction with delay using these: let delay = 1.8 * Double(NSEC_PER_SEC) let time = dispatch_time(DISPATCH_TIME_NOW, Int64(delay)) dispatch_after(time, dispatch_get_main_queue()) { //call the method which have the steps after delay. self.rain.alpha = 0 UIView.animateWithDuration(5, animations: { self.rain.alpha = 1 }) self.tip.startAnimating() } But, I need to stop this delay process if, before animation start, user touch the screen. 回答1: iOS

CLR implementation of virtual method calls to interface members

由 落花浮王杯 提交于 2019-11-28 16:32:22
Out of curiosity: how does the CLR dispatch virtual method calls to interface members to the correct implementation? I know about the VTable that the CLR maintains for each type with method slots for each method, and the fact that for each interface it has an additional list of method slots that point to the associated interface method implementations. But I don't understand the following: how does the CLR efficiently determine which interface method slot list to pick from the type's VTable? The article Drill Into .NET Framework Internals to See How the CLR Creates Runtime Objects from the May

win32com.client.Dispatch works but not win32com.client.gencache.EnsureDispatch

由 倾然丶 夕夏残阳落幕 提交于 2019-11-28 08:40:47
问题 i'm learning win32com for python and I've got a strange problem. I'e trying to export Outlook Contacts in a List of Dictionnary. My code works perfectly with win32com.client.Dispatch("Outlook.Application). But it returns 0 contacts with win32com.client.gencache.EnsureDispatch("Outlook.Application) that is supposed to be faster and "safer". Here's my code : class MapiImport(): def __init__(self): self.olApp = win32com.client.Dispatch("Outlook.Application") self.namespace = self.olApp

How to properly add and use D3 Events?

由 跟風遠走 提交于 2019-11-28 03:20:37
I'm having trouble understanding using D3 events and dispatch functions. I have a chart example that I've been working on called: " Vertical Bar Charts With Legends ." Drawing the charts and the legends was easy enough but I'd like to add the ability to highlight each bar as I mouseover its correlating text legend, located to the right of the chart. I've read through all of the event documentation and even looked at a number of examples, most of which are pretty complicated, but I seem to be missing something. Would anyone know how to best accomplish the text legend mouseover functionality

DispatchSourceTimer and Swift 3.0

由 夙愿已清 提交于 2019-11-27 19:06:00
I can't figure out how to make dispatch timer work repeatedly in Swift 3.0. My code: let queue = DispatchQueue(label: "com.firm.app.timer", attributes: DispatchQueue.Attributes.concurrent) let timer = DispatchSource.makeTimerSource(flags: DispatchSource.TimerFlags(rawValue: UInt(0)), queue: queue) timer.scheduleRepeating(deadline: DispatchTime.now(), interval: .seconds(5), leeway: .seconds(1) ) timer.setEventHandler(handler: { //a bunch of code here }) timer.resume() Timer just fires one time and doesn't repeat itself like it should be. How can I fix this? Make sure the timer doesn't fall out

Why BackgroundWorker always is busy?

由 丶灬走出姿态 提交于 2019-11-27 16:38:50
问题 I realized something strange in my background worker in my WPF application. What I'm trying to accomplish right now is to wait until the BW finishes to start another thread. Check the following code: if (bw.IsBusy) { bw.CancelAsync(); System.Threading.ThreadStart WaitThread = new System.Threading.ThreadStart(delegate() { while (bw.IsBusy) { System.Threading.Thread.Sleep(100); } bw.RunWorkerAsync(); }); System.Windows.Application.Current.Dispatcher.Invoke( System.Windows.Threading

How can I implement a dynamic dispatch table in C

由 纵饮孤独 提交于 2019-11-27 09:19:02
First of all, I understand how to implement a dispatch table using function pointers and a string or other lookup, that's not the challenge. What I'm looking for is some way to dynamically add entries to this table at compile time . The type of code structure I'd hope for is something like: Strategy.h - contains function definition for the dispatcher and dispatch table definition Strategy.c - contains code for dispatcher MyFirstStrategy.c - includes Strategy.h and provides one implementation of the strategy MyOtherStrategy.c - includes Strategy.h and provides a second implementation of the

Dispatch CLI not passing Entities from Luis App

由 放肆的年华 提交于 2019-11-27 08:54:19
问题 When generating a Dispatch model using the CLI, it doesn't pass the Entities from the Luis app in reference. This drastically affects the accuracy of the dispatch app. For example, for the utterance "My [iPhone] isn't working", iPhone is attached to an entity list name CellPhoneType. There are three items in the list iPhone, Samsung, Smartphone. In the bot emulator, using the Dispatch, if I write "my iPhone isn't working", the dispatch model passes it to Luis, as it should. However, if I
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