Can I assume in C, C++, JavaScript, or any other modern language that if I have the following code snippet...
bool funt1(void) {…}
bool funt2(void) {…}
if (funt1() && funt2()) {Some code}
...I am guaranteed that both functions will be called, or is there a possibility that if funt1 returns false, the compiler may skip calling funt2?
In programming languages like C, C++, and Javascript, the logical operators && and || exhibit short-circuit behavior. For example, in the expression A && B, A is evaluated first and B is only evaluated if A returns true. Similarly, in A || B, B is evaluated only if A returns false. These rules are enforced by the language standards and hold true even when B includes side effects.
In C++, these rules only apply to the logical operators when applied to built-in types, not to user-defined logical operators with the same name. However, in the provided code snippet, two bool values are being compared, indicating that this is not a user-defined && operation.
In the realm of C++, one must navigate carefully as there exists a potential pitfall. Should the initial and subsequent functions yield objects that are both crucial for the logical operation, the absence of a short circuit can complicate matters.
#include <iostream>
struct A {};
struct B {};
bool operator || (const A&, const B&) { return true; }
A a() { std::cout << "A\n"; return A(); }
B b() { std::cout << "B\n"; return B(); }
bool f() { std::cout << "f\n"; return true; }
bool g() { std::cout << "g\n"; return true; }
int main(int argc, char* argv[])
{
if(a() || b());
if(f() || g());
}
Your question:
Is it a sure thing that both functions will be executed, or is there a possibility that if
funt1returnsfalse, the compiler might skip callingfunt2altogether?
If funt1() returns false, then it is certain that funt2() will not be called at all.
However, if funt1() returns true, then you can be assured that funt2() will indeed be called.
Having issues with my Angular 11 cli app and Jest integration. Whenever I run npm run test, specifically jest --updateSnapshot, I encounter the following error in my terminal: Error: TypeError: Cannot read property 'paths' of undefined Here is ...
I'm currently learning about async calls in protractor as a newbie to the tool. I am struggling to figure out how to handle a boolean variable that I set to true if any test case fails and the execution goes to the catch block for a promise. Below is ...
Looking for help with inserting HTML code into a div using jQuery. <div id="addme"></div> Here is some HTML with PHP: <div class="col-md-4 product secondproduct"> <div class="images1"> <a href="<?php echo base_u ...
I have created a dynamic form with three interconnected select elements. The first select element is populated with data fetched from a MySQL database using PHP. The second select element is populated based on the selection made in the first one, triggered ...
I've been working on editing a project to incorporate a root view/state that encapsulates all other views/states within it. Previously, each page functioned as an independent state, making it cumbersome to implement global changes across all states wi ...
Is there a way to dynamically change the color of a div from black to white every two seconds, and then from white to black, continuously toggling as long as the div is visible? Essentially, I want the div to only be displayed when a user clicks and drag ...
As part of my interactive chat simulation project, I have implemented a feature where users can click on a button named obj4 to start their chat session. Initially, everything functions smoothly, displaying messages 1-4 in the correct order. However, when ...
I am working on validating a .aspx form using the jQuery Validate plugin. I have created a validation function that includes rules for checking and messages to display error messages. Despite adding all required plugins and calling the necessary functions ...
I'm looking to make a child div stick to the bottom when the parent div reaches the bottom of the browser window. Note: This behavior should only occur when the parent div is pushed down, not when the page is scrolled down. For instance, in my demon ...
I am facing an issue with my jQuery UI dialog that contains a dynamic <select> populated with Angular and AJAX. The problem is that the AngularJS script still runs even when the dialog is not visible. To solve this, I added a condition to stop the s ...
As a newcomer to React development, I am currently in the process of tidying up my code. One issue that I am facing is how to deal with a particular function while minimizing the use of if-else statements. const calculatePerPage = () => { if ...
I have a straightforward layout function adjustLinks($scope) { $scope.links = [ { text: 'Menu Item 1', url: '#', },{ text: 'Menu Item 2', url: '#' ...
I have created a Dashboard.vue component consisting of two child components: DisplayBooks.vue and sortBooksLowtoHigh.vue. Initially, the sortBooksLowToHigh component is hidden while the displayBooks component is visible by default. The requirement is that ...
After creating a class and populating an array of objects with data, I am now faced with the task of sorting the entire array by a specific member of that class. How can I achieve this using the stable_sort() function? In my current setup, here's the ...
Below is a functional example in my CodePen showing what should be happening. Everything is working as intended with hard coded data. CodePen: https://codepen.io/anon/pen/XxNORW?editors=0001 Hard coded data: info:[ { "id": 1, "title": "Title one ...
For a few months, I have been using npm without any issues. However, once I installed python/django and created a virtual environment, npm stopped working altogether. An error message similar to the following is displayed: sudo npm install -g react-nativ ...
I am facing an issue with my ajax request. Actually, I am unsure of how to fetch multiple records. I attempted the following: $rqt = "SELECT a,b,c from table"; $res = mysql_query($rqt); while ($data = mysql_fetch_assoc($res)): $objet = $d ...
The date and time stored in my database appear to be manipulated when fetched. Specifically, when I send this data directly via email from the server, the date and time change. When accessing the date on the client side, it appears as expected. However, i ...
I am currently attempting to include the jQuery DataTable JS file in my plugin to showcase database query results using DataTable. The JS file is stored locally on the server. Information about versions: WordPress: v4.0.1 jQuery: v1.11.1 DataTable: v1.10 ...
While working on my React project with styled components, I have encountered an issue where media queries are not being applied. Interestingly, the snippet below works perfectly when using regular CSS: import styled from 'styled-components'; exp ...