Question: class A { public: void f() &; }; What does & mean after a function declaration? Answer: This means that the function can be called on an lvalue object of class A . Consider the following example #include <iostream> class A { public: void f() & { std::cout << …
Question: There is a field of pixels and a code for selecting a pixel that changes color: $(“.pixel”).click(function() { $(this).toggleClass(“white”); $(this).toggleClass(“black”); }) var delta; var isCall = false; if (!isCall) { var zoom = 1; isCall = true; } #art { width: 101px; height: 101px; display: table; border-spacing: 1px; background-color: …
Question: Question: I have an array with a mixture of strings and numbers as elements. I want to sort all of this in numerical order, what should I do? For example, if you have the following array: [“123”, 200, “12”, 85] I want to sort this as follows. [“12”, 85, …
How do I sort an array of mixed strings and numbers in Ruby? Read More »
Question: Viewing a code here on SOpt, I noticed the use of the symbol "$" and I was in doubt about its use. What is the "$" symbol before a string ? What is it for? Why use it? Example using static System.Console; public class Program { public static void …
c# – What does the symbol "$" before a string mean? Read More »
Question: Right now I have a very secret number in my client application. It lies in the resources, strings.xml , we urgently need to come up with something so that the picking hackers cannot find anything, or at least stop their atrocities 🙂 This number consists of 50 digits, it …
java – How to hide secret number from decompilers in android application? Read More »
Question: I draw like this: Bitmap bitmap = Bitmap.createBitmap(w, w, Bitmap.Config.ARGB_8888); Canvas canvas = new Canvas(bitmap); canvas.drawARGB(1, 178, 229, 255); Paint p = new Paint(Paint.ANTI_ALIAS_FLAG); p.setColor(Color.BLACK); p.setStyle(Paint.Style.STROKE); p.setStrokeWidth(1); canvas.drawCircle(400, 400, 100, p); There is a component: ImageView iv = (ImageView) findViewById(R.id.iv); How now to display the drawn on the screen …
java – How to display the drawn image in ImageView? Read More »
Question: Hello! There are blocks (each has its own id), when clicked, the corresponding class is added to them. We clicked on block number 1, a class was added to it. They clicked on block No. 2, a class was added to it, while the class was removed from block …
javascript – How to remove the class for a block when it is clicked again? Read More »
Question: I have a screen with an EditText there, whenever I enter it, the keyboard opens. I wanted it to only open the keyboard when I clicked on it. I tried this but the keyboard is not opening at all: mItemDescriptionTextView.setFocusable(false); Answer: You need to add android:windowSoftInputMode="stateHidden" inside your AndroidManifest.xml …
android – Do not open keyboard automatically when entering screen with EditText Read More »
Question: Please give real examples of using these parameters, when they are indispensable or they greatly simplify the code. Answer: Let's look at the code below: #include <vector> #include <list> using namespace std; template <template <typename T> typename Cont> class Foo { private: Cont<int> values; }; template <typename Cont> class …
Question: I came across a situation where I need to leave the connection open if the user pressed F5 in the browser, disconnect should only work if the user, for example, closed the tab or browser. This is necessary, for example, if a person visits the site, and when the …
