this

问题 I had working on a class and started writing everything in the same .cpp file. However, after a while I could see the class getting bigger and bigger so I decided to split it into a .h and a .cpp file. gaussian.h file: class Gaussian{ private: double mean; double standardDeviation; double variance; double precision; double precisionMean; public: Gaussian(double, double); ~Gaussian(); double normalizationConstant(double); Gaussian fromPrecisionMean(double, double); Gaussian operator *

问题 Sorry for asking it again, there are already some questions about this keyword. But all of them tell the purpose of 'this'. When do you use this keyword C# when to use this keyword Use of “this” keyword in formal parameters for static methods in C# Proper usage of “this.” keyword in C#? My question is when not to use 'this' keyword . OR Is it all right to use this keyword always in situation like the code class RssReader { private XmlTextReader _rssReader; private XmlDocument _rssDoc; private

问题 I'm trying to use jQuery's $(this) inside of Fancybox's onComplete event, but I'm running into trouble. Here's my javascript code: $('a.iframe').fancybox({ centerOnScroll: true, onComplete: function(){ var self = $(this); var title = self.title; alert(title.text()); } }); I have simplified the code above to get my point across, but I actually would love to use $(this) for several reasons that I won't go into here. Fancybox's documentation shows examples of using this instead of $(this) within

问题 Issue: passing a generic lambda (to a template function) that captures this and calls a member function of this without an explicit this-> does not compile on gcc. If the lambda is not generic, or if the lambda is not passed to any other function but called in place, it compiles withoit an explicit this-> . Clang is cool with the code in all situations. Time for another round of clang vs gcc . Who's right? Wandbox example template<typename TF> void call(TF&& f) { f(1); } struct Example { void

问题 In Java you can refer to the current object by doing: this.x = x . How do you do this in C++? Assume that each of these code examples are part of a class called Shape . Java: public void setX(int x) { this.x = x; } C++: public: void setX(int x) { //? } 回答1: Same word: this Only difference is it is a pointer, so you need to use the -> operator: void setX(int x) { this->x = x; } 回答2: The C++ equivalent is this , but there are a few differences. This is a pointer to the object in question, not a

问题 I'm trying to create a generic autocomplete script using jQueryUI. The autocomplete should work for every: <input type='text' class='autocomplete' id='foo'/> <input type='text' class='autocomplete' id='bar'/> ... Now I'm trying to access 'foo' or 'bar' in the source function using $(this), but when alerting I always get 'undefined'. $('input.autocomplete').autocomplete({ source: function(req, add){ var id = $(this).attr('id'); alert(id); } }); What am I doing wrong? 回答1: Setup autocomplete

问题 This question already has answers here : Closed 8 years ago . Possible Duplicate: jQuery $(this) vs this I'm new to this and trying to get my concept right. There has been many instances of the use of " this " and " $(this) ". Can someone please explain the difference and in what condition that we use the two different "this"? 回答1: In jQuery functions, this most often refers to the actual DOM element you're dealing with, whereas $(this) returns a jQuery object that wraps the element. In

问题 This question already has answers here : Closed 8 years ago . Possible Duplicate: jQuery $(this) vs this I'm new to this and trying to get my concept right. There has been many instances of the use of " this " and " $(this) ". Can someone please explain the difference and in what condition that we use the two different "this"? 回答1: In jQuery functions, this most often refers to the actual DOM element you're dealing with, whereas $(this) returns a jQuery object that wraps the element. In

问题 I understand what this does, but what is the difference between *this and this ? Yes, I have Googled and read over *this in my text book, but I just don't get it... 回答1: this is a pointer, and *this is a dereferenced pointer. If you had a function that returned this , it would be a pointer to the current object, while a function that returned *this would be a "clone" of the current object, allocated on the stack -- unless you have specified the return type of the method to return a reference.

问题 I've got a simple C "class" I have implemented, using function pointers in a struct to implement the member functions, and passing a pointer to the struct as the first argument to each function, similar to the implicit "this" pointer in C++. %module mytest %{ typedef struct mytest mytest; struct mytest { int data; int (*func1)(mytest *,int); void (*func2)(mytest *,int); }; int f1(mytest *me,int n) { return me->data + n; } void f2(mytest *me,int n) { me->data += n; } mytest *mytestNew(int n) {