461 Topics
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 | Hello, I am working on an event driven library and am having one minor problem. Basically I have two ways to get what I want done. Method 1: Smart pointers and factory functions #include <iostream> #include <vector> #include <memory> using namespace std; class Object { public: virtual int getInt(){return 0;} … |
 | #ifndef BASE_H #define BASE_H class Base { public: int m_nValue; Base(int nValue=0) : m_nValue(nValue) { std::cout << "Base" << std::endl; } }; #endif #ifndef DERIVED_H #define DERIVED_H #include "Base.h" class Derived: public Base { public: double m_dValue; Derived(double dValue=0.0) : m_dValue(dValue) { std::cout << "derived se" << std::endl; } friend …  |
| | Hello, I am having a particularly nasty case of "What is the syntax?" while working on an event driven library. Basically this is what I want: class Object {// private: public: virtual bool onEvent(Event e)=0;//all objects have to react to events Object operator|(const Object &o) { // I want to … |
| | #include <string> #include <iostream> #include <vector> using namespace std; class Person { public: Person(); Person(string n, string a, string tel, string em); string getName(); string getAddress(); string getTel(); string getEmail(); virtual string whatAmI(); private: string name, address, telephone, email; }; Person::Person() { } Person::Person(string n, string a, string tel, string … |
| | Hello, is this how a constructor is created and initialized. I am getting an error; VB does not like the "New" what I am trying to do is to create a constructor with one argument and initialize its attribute. Public Sub New(ByVal newProdNumber As Long) intProdNumber = newProdNumber End Sub … |
 | Hi, I do have doubt regarding const declaration in copy constructor. Can anyone let me know why do we need const reference in copy constructor, as we already know reference itself is const pointer.So why we should use const as a prefix in copy constructor. Regards, Mohan  |
| | I'm trying to create a list stack that implements some interface called SomeList The list stack should only use stack with no links. the itnerface has a number of methods that I would like to implement. So for SomeList I have something like public interface SomeList<T>{public void plus(T something);public E …  |
| | Hi, Is there any way to not allow private construction in friend function, In case we do have private constructor with friend function in our class.Only Static method should be responsible for object creation and other than this compiler should flash error message. #include<iostream> #include<memory> using namespace std; class a … |
 | Hello, I am developing a site where I have once class file that deals with a few database tables. My question is: Is it better to have one big file (the class) and then require only this file or have a class for each table and then have more require …  |
| | I'm having trouble pinpointing the exact definition of a generic linkedstack class Suppose I have public class LinkedStack<T> { //some variables //would this be right LinkedStack(){ } //for a generic constructor of type T for the LinkedStack class of type T? } |
| | Hey guys, slightly less noob programmer here for a some more help, This week in class we were assigned to create a phonebook with a couple functions to manipulate it, but it seems I am having a couple problems. It seems to me that I have most of the program …  |
| | Hey guys i am having trouble with creating a Parent class(gameobject) for two other child classes(player,location) both of the child classes can access data from the parent class, and work well independently but once i include the h file for the child classes together in main.cpp i get the compiler …  |
| | Hi Guys, I am trying to teach myself templates and I keep getting lost in all these compilation errors. Here is the latest // This is the interface for the base class template<class V, class I =int> class Array{ private: vector<V> myStore; public: Array(); Array(I size); Array(I size, V value); … |
| | Hey guys, noob programmer here. Over the last week or so we've been learning about classes and inheritance in my latest progamming class. I've recieved a variation of the ever so popular poker program and am having some problems putting it all together. I haven't had the opportunity to test … |
 | I'm afraid to ask this on SO because all I can get is down-vote so I ask it here.* ## **Question:** ## Does C/C++ compiler (e.g the popular "gcc") with OO concepts allocates/creates all data member if other data member are not in use? /************************************* * code for example: * … |
| | So! I'm building a GUI for an application I'm currently developing and I'm having a bit of trouble figuring out an issue. I'll try to explain it as best as I can in the code lines. Basically, I built a class to handle the initial window for the program, but … |
| | Ques : Define the class Book with all the basic attributes such as title, author, publisher, price etc. Define the default constructor, member functions display_data() for displaying the Book details. Use appropriate access control specifiers in this program I have done some part #include<iostream.h> #inlude<conio.h> using namespace std; class book … |
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| | [B][I][U]Introduction [/U][/I][/B] [COLOR="Red"]Hey everybody welcome to a tutorials on classes in PYTHON. The purpose I made this tutorial for is that when I was learning classes in python I dint found any good tutorials on Classes. Maybe I was wrong. But here's my tutorial.[/COLOR] [B][I][U]Layout[/U][/I][/B] In this tutorial i'll be …  |
| | class name { char *s; int len; public: name(){ // Default constr. s=NULL; len =0; } //************************************************** ~name(){ // Destruct. if (s!=NULL){ delete [] s; s=NULL; } } //************************************************* name(const char * s1); // Constr. char* getName(); //fcn get name int getLen() ; // fcn get lenght void setName(const char …  |
| | Hi All, I have just finished reading fundamental topics in Java and now i have decided to do a New Project in Java which comprises all basic features of Java. I need help in Understanding/visualizing the architecture / Design model for my Project. Specification is : 1 . Develop a …  |
 | I have the following structure: CObject { protected: char *mName; public: CObject(char *n) { mName=strdup(n); } }; CVector:public CObject { char *mValues[50]; int mElements; public: CVector(char *n):CObject(n) {} }; CMatrix:public CObject { char *mValues[50][50]; int mLines; int mColumns; public: CMatrix(char *n):CObject(n) {} }; My main function: int main() { pV=new … |
| | Hello, I have a chain of inherited classes like this: class A { protected: int a; public: int getA(){return a;} }; class B:public A { protected: int b; public: int getB(){return b;} }; Based on that you can see that the public can only read the values in those classes, … |
 | am a python beginner, receeently started learning about classesand i wrote this got this little code that keeps bringing this error . please i need someone here to help debug it: class employee(): ` empcount=0` def _init_(self,name,salary): self.name=name self.salary=salary employee.empcount=+1 def displaycount(self): print 'Total employee: %d' %employee.empcount def displayemployee(self): print … |
 | Traceback (most recent call last): File "C:/Users/James/Desktop/hugevar.py", line 2, in <module> class var(tempfile.TemporaryFile): TypeError: Error when calling the metaclass bases function() argument 1 must be code, not str Why does this happen and how can I fix it?  |
 | Hi all, I've been playing around with PHP for a while now and never really studied hardcore (Just used it as best as I could on a whim) but I've now decided to sharpen the skill and get much better. I'm playing around with my first class and would like … |
 | hello, I just had a quick question on my program. I'm trying to perform an elevator class program to simulate an elevator that has 3 stops. The only problem is that I can't figure out how my floors increase or decrease, it just increases by one. Here is my code: … |
 | Hi All, I have created an application that allows a user to select a diectory, where we parse the photos, and upload to a database. The issue that I am having is that I have a button on the form found in the newJFrame.java class called upload that when pressed … |
| | Hi, Please tell me in the following question why no copy constructor is called when fun returns the A object. While returning b and constructing c, there is no copy constructor called. Why?? #include<iostream> using namespace std; class A { public: A(){cout <<"Default\n";} A(const A&){ cout<<"copy\n"; } A fun(A a) …  |
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