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Delete an object from a vector

由 此生再无相见时 提交于 2019-12-13 09:06:51
问题 Step 1. Create an instance of a class Step 2. Push this instance to a vector Step 3. Call delete this; in a member method of an instance Step 4. Everything is Ok Step 5. Push something to the vector and get this *** glibc detected *** ./app: double free or corruption (fasttop): 0x0000000001017930 *** ======= Backtrace: ========= /lib/libc.so.6(+0x71bd6)[0x7f607d60cbd6] /lib/libc.so.6(cfree+0x6c)[0x7f607d61194c] ./app[0x40231c] ./app[0x402290] ./app[0x4053c0] ./app[0x4048fe] ./app[0x404246] .

How to access JavaScript function which is in function which is in function

由 佐手、 提交于 2019-12-13 08:49:42
问题 Is there any way to access a function which is inside a function, which is inside an other function in JavaScript? function x(name, age) { this.name = name; this.age = age; this.a = function() { this.b = function() { return "b"; }; return "a"; }; } var xobj = new x('vin', 25); console.log(xobj.a.b()); //error 回答1: you can do function x(name, age){ this.name =name; this.age = age; this.a = function(){ this.b = function(){ return "b"; }; return "a"; }; } var xobj =new x('vin',25); var xx = new

Javascript Objects, specifically this keyword [closed]

由 给你一囗甜甜゛ 提交于 2019-12-13 07:53:30
问题 It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center. Closed 7 years ago . I am currently learning javascript at the moment and am struggling to understand objects, especially the "this" keyword. I have gone through tutorials on W3schools and searched youtube and would like if someone

Javascript using bind within an object, how can I access object this?

由 僤鯓⒐⒋嵵緔 提交于 2019-12-13 06:05:36
问题 I am building an event manager for a little game that I am creating and have stumbled on a little problem (I don't know if it is a design pattern problem or if there is a solution to it)! Take below for example; o.Events = (function() { "use strict"; function mousedown() { // Set mousedown boolean // # How can I change o.Events.mousedown // For each layer this.layers.forEach(function(layer) { // Layer is listening if (layer.listening && layer.mouse.x && layer.mouse.y) { console.log("mousedown

Refer to the main JavaScript object from functions which are methods on a subobject

由 白昼怎懂夜的黑 提交于 2019-12-13 05:18:59
问题 While working with javascript object I came to this code : var mainModule = { opt : { opt1: 'my option1', opt2: 'my option2', opt3: 'my option3', }, init: function(options){ jQuery.extend(this.opt, options); this.mainMethod(); }, mainMethod: function() { //do Stuff var color = this.opt.opt1; }, secondaryMethod1: function(){/*stuff*/}, secondaryMethod2: function(){/*stuff*/}, secondaryMethod3: function(){/*stuff*/}, secondaryMethod4: function(){/*stuff*/}, thirdlyMethod1: function(){/*stuff*/}

script works on jsfiddle but not in my webpage jquery

由 南笙酒味 提交于 2019-12-13 03:35:51
问题 With help from @Joseph I have managed to create this script that works exactly the way I want it to on jsfiddle. However, when I use the exact same script on my webpage it does not do anything, it ignores the script inside the if and else and works like a normal radio button would do. I don't get any errror messages and I am using: http://ajax.googleapis.com/ajax/libs/jquery/1.6.2/jquery.min.js http://ajax.googleapis.com/ajax/libs/jquery/1.6.2/jquery.js The only thing that I can think of is

Value of this is undefined

由 可紊 提交于 2019-12-13 03:21:22
问题 I have a this value inside an if statement, nested inside a my handleFormChange function. I've tried to use arrow functions with this function to bind the value of this but im getting the following error message: TypeError: Cannot set property 'author' of undefined From my understanding usually you find the this value by looking at where the function containing this is called. However, in my case im struggling to work this out. Can anyone explain to me why it is undefined and how to solve

Android context using “this” on class that is not an activity

由 大城市里の小女人 提交于 2019-12-13 03:08:20
问题 I created the following class to populate a listView with two different kinds of views. One of the two kinds contain is a spinner, which I'm trying to populate with Arraylists (one for each spinner) contained in the bundle. The problem I'm dealing with is the ArrayAdapter constructor, which clearly has a problem with the context I'm using ("this"). Any ideas? public class InsertAdapter extends BaseAdapter { private static final int OWN_KEY = 0; private static final int FOREIGN_KEY = 1;

How do I ensure that Javascript's “this” will refer to the object when using setTimeout?

由 空扰寡人 提交于 2019-12-13 02:48:32
问题 <!doctype html> <html> <head> <title>What is 'this'?</title> <script> function Obj(){ log('Obj instantiated'); } Obj.prototype.foo = function (){ log('foo() says:'); log(this); } Obj.prototype.bar = function (){ log('bar() was triggered'); setTimeout(this.foo,300); } function log(v){console.log(v)} var obj = new Obj(); </script> </head> <body> <button onclick="obj.foo()">Foo</button> <button onclick="obj.bar()">Bar</button> </body> </html> And here is the console output: Obj instantiated foo(

How do I know when to use .bind() on a function in JS?

由 大城市里の小女人 提交于 2019-12-13 00:18:43
问题 (I'm aware of this question, but the answers don't quite tell me what I need to know.) I've come across cases where I need to use .bind() on a function in JavaScript in order to pass this or local/class variables to a function. However, I still don't really know when it's needed. What is the criteria for knowing when this or local/class variables will or will not be available in a function, exactly? How do you reason about this? For instance: When a new anonymous function() { } is created,
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