void

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 3 years ago . I'm having trouble with creating an app in Swift2. The App has an image of a wolf which changes every 0.4 seconds to reveal a running wolf. However I have Bool errors in Swift 2 that I cannot fix. I also have issues with declaring a void function. Any help would be appreciated.

问题 I am writing J-Unit Tests for my project and now this problem occured: I am testing a servlet which uses a Utility class (class is final, all methods are static). The used method returns void and can throw an IOException (httpResponse.getWriter). Now I have to force this exception... I have tried and searched a lot, but all the solutions I found did not worked, because there was no combination of final, static, void, throw . Has anyone did this before? EDIT: Here is the code snippet Servlet:

问题 I originally had a global variable for my fibonacci variable array, but found out that is not allowed. I need to do elementary multithreading and handle race conditions, but I can't get past feeding an int as a void argument in pthread create. I've tried using a constant pointer with no luck. For some strange reason the void* gets past the first boolean test but not the else if: $ gcc -o fibonacci fibonacci.c fibonacci.c:22:16: warning: comparison between pointer and integer ('void *' and

问题 I have got this error on the line where the void is it says undeclared identifier for sliderDidChange can some one please help me with this i can;t find any answers. h. file // // LightViewController.h // Flash Light // // Created by John Whitney on 12-07-27. // Copyright (c) 2012 Perfect Programs. All rights reserved. // #import <UIKit/UIKit.h> #import <AVFoundation/AVFoundation.h> @interface LightViewController : UIViewController { IBOutlet UISlider *slider; IBOutlet UISlider *theslider;

问题 I'm looking at example abo3.c from Insecure Programming and I'm not grokking the casting in the example below. Could someone enlighten me? int main(int argv,char **argc) { extern system,puts; void (*fn)(char*)=(void(*)(char*))&system; char buf[256]; fn=(void(*)(char*))&puts; strcpy(buf,argc[1]); fn(argc[2]); exit(1); } So - what's with the casting for system and puts? They both return an int so why cast it to void? I'd really appreciate an explanation of the whole program to put it in

问题 Why does the following code fail to compile? Even though it is legal to do void* ptr = 0; template <void* ptr = 0> void func(); int main() { func(); return 0; } I ask because I found that a very trusted source did something similar and it failed to compile on my machine NOTE Should have posted the compiler error along with my question so here it is so_test.cpp:1:23: error: null non-type template argument must be cast to template parameter type 'void *' template <void* ptr = 0> ^ static_cast

问题 I read this MSDN article: Unit Type (F#) ...The unit type is a type that indicates the absence of a specific value; the unit type has only a single value, which acts as a placeholder when no other value exists or is needed ... The unit type resembles the void type in languages such as C# and C++... So... Alright, I understand, that the unit type is such a type, which has only a single value () . But I have some questions: Why is it needed? When is it needed? I don't understand why not to use

问题 I am creating a program that simulates some people catching fish in a lake, I already created classes for Fish and Pond and I was working on the Fisher class and a method is not working and I'll show the code (I'm new to programming so I'm not sure if I am providing enough information) public class Fisher { public static int LIMIT = 3; private String name; private Fish[] fishCaught = new Fish[LIMIT]; private int numFishCaught; private int keepSize; public Fisher(String name, Fish[] fishCaught

问题 How can I get the reason an envelope was voided thru the API? The envelope could be voided in multiple ways so it would be nice to know if it was voided because it expired as opposed to if the sender voided it. Can this be added to the envelope status object? 回答1: When you get status of an envelope through REST, voidedReason is one of the responses. https://demo.docusign.net/restapi/v2/account/{accountId}/envelopes/{envelopeId} status:"voided", .. voidedDateTime:"2014-02-02T11:37:18.5500000Z"

问题 How to call such a scala function? def f(v: Void): Unit = {println(1)} I haven't found a value of Void type in Scala yet. 回答1: I believe using Void / null in Java is similar to using Unit / () in Scala. Consider this: abstract class Fun<A> { abstract public A apply(); } class IntFun extends Fun<Integer> { public Integer apply() { return 0; } } public static <A> A m(Fun<A> x) { return x.apply(); } Now that we defined generic method m we also want to use it for classes where apply is only