this

问题 I was wondering if there is a shorter, better or cleaner way to assign and use class variables in PHP, then through $this->instance_variable ? class Bar { # internal variables var $foo = "Hello World"; public function foo() { return $this->foo; } } I am not very familiar with all PHP's variable scoping, but from what I understood at the official docs, you can either define them global, or access them trough $this-> ? Is there a keyword to define them as instance variable, so they are

问题 This question already has answers here : Does every c++ member function take `this` as an input implicitly? (4 answers) Closed 2 years ago . I was doing some reading on the 'this' pointer, and I think I understand it more than I originally did, but I still need some clarification. So, by my understanding, if you have class Simple { private: int m_nID; public: Simple(int nID) { SetID(nID); } void SetID(int nID) { m_nID = nID; } int GetID() { return m_nID; } }; The SetID(int nID) function

问题 In the following code, I'm wondering how context is bound to this : In obj.myMethod(); , context is given to the object. So logging it gives the object. In var myFun = obj.myMethod; then myFun(); , context is given to the Window. The only difference is you're setting the function to a variable. var obj = { myMethod : function () { console.log(this); //'this' is bound to context of object } }; obj.myMethod(); //calling object property directly = Object {myMethod: function} var myFun = obj

问题 class binaryOperators { public: int i; binaryOperators (int tempI = 0) { i = tempI; } binaryOperators operator+ (const binaryOperators &right); }; binaryOperators binaryOperators :: operator+ (const binaryOperators &right) { return binaryOperators (*this + right.i); } binaryOperators operator+ (const binaryOperators &left, const binaryOperators &right) { return binaryOperators (left.i + right.i); } int main () { binaryOperators obj (10); obj = 11 + obj; obj = obj + 11; return 0; } So, here

问题 I am attempting to create a simple dropdown that is triggered by a hover event. To save on writing code I want to take advantage of the $(this) selector but I keep running into a problem when I try to target $(this) next 'a' element. Does anyone know the correct way to code this while still using the $(this) selector? In the below code if I change $(this).next('a') to $('.base a') the code works fine but then I would have to write the same block of jQuery code for each time I want to use this

问题 I'm working on a script that fades in and out both an image and a div I have set behind the image when you hover over the image. I'm having two problems: The fades on the image and div don't seem to move at the same speed even though I have them set to. I can't figure out how to get the div's to only show for the image you hover over. If I could type ("this" div.info) as an object, it would work fine. Is there a way to do that? I can't get $(".info",this) , $(this).find(".info") , or $(".info

问题 Is there a difference between this.form and document.forms (document["forms"]) or, are they similar? Here is the code I wrote to test the difference. <form name="myForm" id="myForm"> <input type="text" name="haha" id="myForm" value="laughable" onclick="alert(this.form.haha.value)" /> </form> alert(document.forms.myForm.haha.value); They both result in the same thing. 回答1: this.form will give you the form of the form element. ( this is the form element) The containing form element, if this

问题 This question already has answers here : Closed 8 years ago . Possible Duplicate: What is the difference between scala self-types and trait subclasses? From example in scalatest site. There is one particular thing I don't really understand trait FunSuiteStackBehaviors { this: FunSuite => //This line def a() {} def b() {} } class StackFunSuite extends FunSuite with FunSuiteStackBehaviors {} As far as I understand, it seems like they try to assign some defs into a trait. But what does this:

问题 I am trying to make a tictactoe project in jQuery and I am having a major problem... The tiles are in <td> tags and I am trying to make it so that when the user clicks the the tile, it calls the "marked" function. If we now look into the "marked" function, $(this) is intended to be the <td> node that the function was called from. However, it wasn't doing anything so I checked the console and apparently $(this) was containing the DOM Window object. Is there anyway I can send the right kind of

问题 How to write a base class and several derived classes of iterator? Does the iterator have to return itself (*this)? So far, I use typename X and static_cast<X&>(*this) to allow the derived class to inherit a function that return itself from the base class. This looks ugly. Is there a better way? Simplified Code: #include <iterator> #include <iostream> template <typename T, typename X> class BaseIterator : public std::iterator<std::input_iterator_tag, T> { //Not intended to be used directly.