self-invoking-function

How to properly invoke a function object within a class template's member function? Visual Studio Compiler Error C2440 is being generated

由 帅比萌擦擦* 提交于 2020-06-17 14:23:07
问题 This is a follow up to this question found here! Now, that I'm able to instantiate the object. I'm now getting a Visual Studio C2440 Compiler Error... In my original code before it was templated I had a set of member functions that worked on the std::function<double(double)> member object that looked like this: struct SomeStruct { double a_; double b_; SomeStruct(double a, double b) : a_{a}, b_{b} {} }; class SomeClass { private: SomeStruct fields_; size_t n_; std::function<double(double)>

Spring @Transactional Annotation : Self Invocation

由 假装没事ソ 提交于 2020-01-19 10:03:26
问题 I know when a transactional method is called from inside the same class it wouldn't be run in a transaction. Spring creates a proxy for transactional methods and wraps them in a try-catch block and rolls back if an exception occurs. Consider the following scenario: @Transactional public void saveAB(A a, B b) { saveA(a); saveB(b); } @Transactional public void saveA(A a) { dao.saveA(a); } @Transactional public void saveB(B b) { dao.saveB(b); } Assume saveAB is called from another object and an

need more explanation on w3schools javascript closure example

由 故事扮演 提交于 2019-12-31 02:54:11
问题 I'm trying to understand closures and am looking at the W3Schools javascript tutorial. This is one example they give by making a counter. <body> <p>Counting with a local variable.</p> <button type="button" onclick="myFunction()">Count!</button> <p id="demo">0</p> <script> var add = (function () { var counter = 0; return function () {return counter += 1;} })(); function myFunction(){ document.getElementById("demo").innerHTML = add(); } </script> </body> Example Explained The variable add is

Problem with self-invoking functions calling other functions

由 ﹥＞﹥吖頭↗ 提交于 2019-12-24 12:35:04
问题 In my index.html file (before closing body tag), I want a function to self-invoke itself when the page is loaded. However, I am having issues when the function (here, setUp) is defined in an external file. If I copy-paste the setUp function in Index.html then everything works as expected. I am new to JS: am I incorrectly linking script file? Thanks! Index.html <script src="Code.gs"> window.onload=setUp; </script> Code.gs function setUp() { dateHelper_(); } 回答1: You want to run Google Apps

Making counter using closure and self-invoking function

由 巧了我就是萌 提交于 2019-12-20 07:10:04
问题 I'm wondering why this code doesn't work, var uniqueInteger = function() { var counter = 0; return function() { return counter++; } }; console.log(uniqueInteger()()); // 0 console.log(uniqueInteger()()); // 0 console.log(uniqueInteger()()); // 0 console.log(uniqueInteger()()); // 0 and this code does. The only difference is making the function self invoked instead of invoking it in console.log() var uniqueInteger = (function() { var counter = 0; return function() { return counter++; } }());

Does Vala support self-invoking?

由 試著忘記壹切 提交于 2019-12-11 21:20:33
问题 Is there any way that Vala supports Self Invoking? Either with a class, or with a method? Javascript supports self invoking like below. Which is what im looking for. (function(){ // some code… })(); I'm attempting to load a class into a hashmap for dynamically loading. 回答1: using Gee; [CCode (has_target = false)] delegate void MyDelegate(); int main() { var map = new HashMap<string, MyDelegate>(); map["one"] = () => { stdout.printf("1\n"); }; map["two"] = () => { stdout.printf("2\n"); };

negating self invoking function? !function ($) { … }(window.jQuery); [duplicate]

由 家住魔仙堡 提交于 2019-12-08 06:45:45
问题 This question already has answers here : Closed 7 years ago . Possible Duplicate: What does the exclamation mark do before the function? I was looking through the Twitter Bootstrap JavaScript code and I noticed all their plugins are wrapped in negating self invoking functions. I am aware that function ($) { ... }(window.jQuery); invokes the function immediately. But what is the ! for? 回答1: 1) if you just do: function () { /* ... */ }(); You will get an error. JS will not allow you to fire off

Self-invoking function jQuery [duplicate]

由 流过昼夜 提交于 2019-12-07 14:41:24
问题 This question already has answers here : What is the purpose of this? (function ($) { //function code here })(jQuery); (4 answers) Closed 6 years ago . I noticed that in some places, jQuery code is wrapped in a self-invoking function like below. Why is this done, in what cases is this useful and in what cases is an unnecessary boilerplate? function( $ ) { ... }( jQuery ); 回答1: The short answer : To prevent variable name conflicts. It is not always needed, but good practice in order to create

Why Don't Variables Reset in a Closure (Javascript)

由 半腔热情 提交于 2019-12-06 12:11:39
问题 I've been trying to learn about closures, but one thing still perplexes me. If I have the following code: var add = (function () { var counter = 0; return function () {return counter += 1;} })(); add(); add(); add(); // Returns "3" If I call add() three times, why dosen't it set counter to zero every time, then return the anonymous funtion that increments counter by one? Does it skip over it once the self-invoking function runs? Sorry if the question seems simple, I'm having a hard time

Self-invoking function jQuery [duplicate]

由 巧了我就是萌 提交于 2019-12-06 04:06:04
This question already has answers here : What is the purpose of this? (function ($) { //function code here })(jQuery); (4 answers) Closed 6 years ago . I noticed that in some places, jQuery code is wrapped in a self-invoking function like below. Why is this done, in what cases is this useful and in what cases is an unnecessary boilerplate? function( $ ) { ... }( jQuery ); The short answer : To prevent variable name conflicts. It is not always needed, but good practice in order to create conflict free reusable code. The long answer : In javascript the $ symbol is just another variable. jQuery
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