oop

问题 was the idea of nested functions considered to be useless during the time of developing older c++ standard, because its usage is basically covered by another concept like object-oriented programming; or it wasn't implemented just as a matter of simplification? 回答1: Nested functions - to be useful - need the stack frame of the containing function as context. Look at this: class Foo() { void Tripulate() { int i=0; void Dip() { // ... } int x = 12; for(i=1; i<=3; ++i) { int z= 33; Dip(); // ...

问题 was the idea of nested functions considered to be useless during the time of developing older c++ standard, because its usage is basically covered by another concept like object-oriented programming; or it wasn't implemented just as a matter of simplification? 回答1: Nested functions - to be useful - need the stack frame of the containing function as context. Look at this: class Foo() { void Tripulate() { int i=0; void Dip() { // ... } int x = 12; for(i=1; i<=3; ++i) { int z= 33; Dip(); // ...

问题 was the idea of nested functions considered to be useless during the time of developing older c++ standard, because its usage is basically covered by another concept like object-oriented programming; or it wasn't implemented just as a matter of simplification? 回答1: Nested functions - to be useful - need the stack frame of the containing function as context. Look at this: class Foo() { void Tripulate() { int i=0; void Dip() { // ... } int x = 12; for(i=1; i<=3; ++i) { int z= 33; Dip(); // ...

问题 concatenative inheritance works like a composition to me when I look to it at the beginning, but people keep naming it as an inheritance. classes, however, use the prototype to create a prototype chain that connects objects together. the question now is, if both concatenative inheritance and class inheritance do the same thing which one to use? here is an example of both scenarios concatenative inheritance function Person(name, address) { const _name = name const _address = address const

问题 I'm trying to use ttkthemes but for some reason when I import it i just get errors, It's telling me AttributeError: module 'ttkthemes.themed_tk' has no attribute 'Tk' so I tried changing Tk to ThemedTk but it still didn't work, thanks for any help in advance. Here's the original code from tkinter import * import tkinter as tk from tkinter import ttk from ttkthemes import themed_tk as tk class SeaofBTCapp(tk.Tk): def __init__(self, *args, **kwargs): tk.Tk.__init__(self, *args, **kwargs)

问题 I'm currently working on my Python Keitaro Admin API request-library which I called keitaropy. Keitaro Admin API docs Keitaro install on domain and have path to api, I'll use https://example.com/admin_api/v1 in this question. To get a response from the API I need to send 2 types of requests: GET, POST I want to work with Affiliate Networks, Campaigns, Streams, Offers and Traffic Sources. I'll call them targets. Every target has different path in url like: to get all campaigns I need to send

问题 I'm currently working on my Python Keitaro Admin API request-library which I called keitaropy. Keitaro Admin API docs Keitaro install on domain and have path to api, I'll use https://example.com/admin_api/v1 in this question. To get a response from the API I need to send 2 types of requests: GET, POST I want to work with Affiliate Networks, Campaigns, Streams, Offers and Traffic Sources. I'll call them targets. Every target has different path in url like: to get all campaigns I need to send

问题 This question already has an answer here : Is it possible to inherit old-style class from ECMAScript 6 class in JavaScript? (1 answer) Closed last month . I am making a library where I would like to provide a helper to extend the base class so that users can extend it even if they are not using ES2015 themselves. The issue is that if the base class happens to be in ES2015 (because it isn't sent through transpiler), my calling of parent constructor from subclass fails with: Class constructor

问题 I am doing a small college project where I have to add, edit and search records in/from file using OOP concept. Adding into file is working fine but whenever I try to read from file it is printing in unreadable texts. Here is full code and output. main.cpp #include <iostream> #include <cstdlib> #include <fstream> #define MIN 20 #define MAX 100 #include "student.h" using namespace std; void add_student(); void edit_student(); void search_student(); void addToFile(const Student&); Student*

问题 My program consists of 2 classes named Main and LinkedList and my program takes 3 arguments. For example, while I can access args[1] in the Main class, I cannot access it in the LinkedList class. It says array access args[2] will produce NullPointerException and If I try to run it, it gaves me NullPointerException . How can I solve this? Here is my code: Main Cass: import java.io.*; import java.util.Scanner; // Import the Scanner class to read text files public class Main { public static void