C++ :: Subclass Objects In One Array?
Jul 16, 2012
i want to save similar objects, meaning having same superclass, in an array. Example: I have a superclass vehicle. Class car and truck inherit from vehicle. Now i have a few from both of them an want to put them in an array, vector, set or else. Is this possible in C++ or are there an workarounds? When i remember right, Java and C# offer this feature.
Here again an example:
Code:
class vehicle{
int mMaxSpeed;
} class truck : public vehicle {
int mTrailerLength;
} class car : public vehicle {
[code]....
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Mar 26, 2014
I am trying to bend my head around polymorphism but I can't figure out how to use the virtual method properly. I have the following superclass:
Code: class comparable
{
public:
comparable();
virtual bool compare(comparable &other)=0;
}; and the subclass:
Code: class score : public comparable
{
public:
score(string player,int highscore);
bool compare(comparable &other);
string name;
int highscore;
};
My problem is that I do not know how to define the virtual function compare in the subclass score:
Code: bool score::compare(comparable &other){
if(this->highscore > other.???){
...
}
}
How do I tell the compiler that the type is of score?
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Feb 10, 2013
class IFoo {
virtual void Bar() = 0;
};
class FooAbstract {
virtual void Bar() {}
[Code] .....
How to call the Bar() method from FooTemplate in FooDerived::Bar()?
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Mar 18, 2015
I'm having problem using the click event in a web browser control. I have a control called CIEBrowser that implements a Web control. Here a message_map:
Code:
IMPLEMENT_DYNCREATE(CIEBrowser, CWnd)
BEGIN_MESSAGE_MAP(CIEBrowser, CWnd)
ON_COMMAND_RANGE(ID_IEHOME,ID_IESTOP, OnToolBarCmd)
ON_UPDATE_COMMAND_UI_RANGE(ID_IEHOME,ID_IESTOP, OnUpdateToolBarCmd)
ON_NOTIFY_EX_RANGE(TTN_NEEDTEXTW, 0, 0xFFFF, OnToolTipNotify)
ON_NOTIFY_EX_RANGE(TTN_NEEDTEXTA, 0, 0xFFFF, OnToolTipNotify)
END_MESSAGE_MAP()
I want to implement a derived class called CFulltextCtrl.
Code:
IMPLEMENT_DYNCREATE(CFulltextCtrl, CIEBrowser)
BEGIN_MESSAGE_MAP(CFulltextCtrl, CIEBrowser)
ON_WM_PAINT()
ON_WM_HELPINFO()
END_MESSAGE_MAP()
I have a dialog with a control using this CFulltextCtrl. I can create and show the html perfectly inside the form. But all links inside this control don't work (scenario 1). If I create a form who have a control of the type CIEBrowser, the EXACTLY same html code works perfectly (scenario 2).
In particular, I need that when I click in one link, execute a method called OnClick, who performs all that I need, just like in scenario 2.
This is my DISPATCH_MAP in the derived class (CFulltextCtrl):
Code:
BEGIN_DISPATCH_MAP(CFulltextCtrl, CIEBrowser)
DISP_FUNCTION_ID(CFulltextCtrl,"HTMLELEMENTEVENTS2_ONCLICK", DISPID_HTMLELEMENTEVENTS2_ONCLICK,
OnClick, VT_EMPTY, VTS_DISPATCH)
DISP_FUNCTION_ID(CFulltextCtrl,"HTMLELEMENTEVENTS2_ONKEYDOWN", DISPID_HTMLELEMENTEVENTS2_ONKEYDOWN,
OnKeyDown, VT_EMPTY, VTS_DISPATCH)
DISP_FUNCTION_ID(CFulltextCtrl,"HTMLELEMENTEVENTS2_ONKEYUP", DISPID_HTMLELEMENTEVENTS2_ONKEYUP,
OnKeyUp, VT_EMPTY, VTS_DISPATCH)
END_DISPATCH_MAP()
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Oct 12, 2014
class FlashCard {
public:
int a,b;
void PrintCard(void);
int CorrectAnswer(void);
};
void SwapFlashCard(FlashCard &a,FlashCard &b)
[Code]....
Why does Xode warn me that Type'FlashCard'does not provide a subscript operator on line 22,23,29 and 30?
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Sep 27, 2013
I've created an Array of pointers to objects using:
Person ** A = new person * [arraysize];
When I intend to access a specific person do I have to do this? :
something = A->[i];
and when I want a specific object within my struct do I have to do this? :
something_else = A->[i]->random_int;
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May 13, 2014
I need an array of class objects but am unsure of how one might accomplish this. I have so far...
//element class driver code
Element Arsenic(lowCeiling, highCeiling);
Element Cadmium(lowCeiling, highCeiling);
Element Chromium(lowCeiling, highCeiling);
Element Copper(lowCeiling, highCeiling);
Element Lead(lowCeiling, highCeiling);
Element Nickel(lowCeiling, highCeiling);
Element Molybdenum(lowCeiling, highCeiling);
Element Mercury(lowCeiling, highCeiling);
Element Selenium(lowCeiling, highCeiling);
Element Zinc(lowCeiling, highCeiling);
Element metal[10] = {Arsenic, Cadmium, Chromium, Copper, Lead, Nickel, Molybdenum, Mercury, Selenium, Zinc};
Could the array be created in this manner or is that illegal code?
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Mar 22, 2013
When I make an array of new objects and write delite arraySelector, will that delite all of the array elements or just the first one?
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Dec 20, 2013
I have Class A as a base class , and Class B , C derived classes from A and there's class D who have a data member (pointer to Array) of type A (Composition)
class D{
A **a;
int size;
.......
a = new A*[size];
......
};
And i have Print method , in its body i have to specific element (if it from class B or C ) with a given ID(both B and C have a data member ID ) there should be 2 options in print function .. printing elements for class B , or printing elements for class C ? how can i specific the elements ?
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Feb 16, 2014
I have a homework requiring me to use quicksort on a pointer array of CDs. They are sorted by the title. I have tried the general solution for integer arrays which sets the pivot at the middle integer but it didn't work/ stopped working when I tried to start sorting the already inputed CDs. The same is happening with the current version (an adaptation of pieces of code):
void swap(CD &a, CD &B)/>
{
CD temp;
temp = a;
[Code]....
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Dec 5, 2013
my code:
int OKCount=0;
int WaitingCount=0;
int ReservationCount=0;
Flight::Flight(int capacity, int waitingMax) {
seats=capacity;
[code].....
reservations is a data member in the class flight as:
Reservation **reservations;
OKReservation is a derived class and its abstract base class is Reservation.
My problem is that the reservations array loses its value in other function
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May 20, 2014
Define a PayRoll class that has data members for an employee's hourly pay rate (an integer , representing cents) and number of hours worked (also an integer ). The class provides two member functions, setRate and setHours that assign the value of their parameter to the appropriate data member. The class provides a third member function, getPay, that returns weekly gross pay (in cents), computed as follows: hours times rate for the first 35 hours plus hours times rate times one and a half for any hours past 35.
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Jun 26, 2013
What I want to do is have an admin class which will hold all the employee objects, can add them, list and calculate salaries. I'm trying to make array of objects, not sure if it's right
here is the code
Code: #include <iostream>
#include <string>
using namespace std;
class Employee {
public:
Employee(string name, short type, int salary)
[Code] .....
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Nov 13, 2013
I am working on building a graph of a maze problem using an adjacency list and my own custom class Node.
Each Node has a vNum and jumpAmount integer variable, the vNum is the unique key.
If I have an array of lists of Node objects declared by: Code: forward_list<Node> adjacencyList[10] I skip the 0 row and only use 1-9. It makes more sense logically for my program and Im not worried about wasted memory at this point.
How could I go about traversing and outputting member variables for all the Nodes in each list in my array?
Say my code builds the following adjacency list:
Code:
1 -> { 2, 3, 4, 7 }
2 -> { 1, 3, 5 }
3 -> { 1, 2, 6 }
4 -> { 1, 5, 6, 7 }
5 -> { 2, 4, 8 }
6 -> { 3, 4 }
7 -> { 1, 4, 8 }
8 -> { 5, 7, 9}
9 -> { 8 }
where the values in brackets are the nodes that have an edge with the ith row node. Had to put it in code tags for the thread to be allowed to post.
I am using the forward_list library for my list functions and this is where my problem arises. The cplusplus.com - The C++ Resources Network website iterates through the list using:
Code:
for ( auto it = mylist.begin(); it != mylist.end(); ++it )
std::cout << ' ' << *it;
Obviously this works for ints, doubles, etc, but not objects with member variables. My attempt to replicate this code for my problem looks like:
Code:
for( int i = 1; i < 10; ++i ) {
cout << "Node " << i << " -> { ";
for( Vertex it = adjList[i].begin(); it != adjList[i].end(); ++it )
{
cout << it.getVNum() << ", ";
}}
I have to come up with user defined conversions for this to work and I have never done such a thing. Is there a way to go about doing this to avoid user defined conversions, because if there isnt I feel like attempting to do this specific problem might be a little too difficult for someone who hasnt defined any custom conversions.
Potentially, I could write my own List class and have a next pointer member variable that points to the next object in the list and use that to use a dot reference to a get function to display member variables. This is how I learned linked lists back in my Data Structures class. However I am trying to avoid that for the time being, as that would be a lot more code to implement rather than just figuring out how to use the forward_list library.
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Feb 11, 2013
So starting with the Item.h file :
#ifndef ITEMH
#define ITEMH
using namespace std;
class Item
[Code]...
I think I'm getting the wrong idea about strings. I thought I could add data just by using '+=' but apparently not.
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Aug 18, 2013
class A {
Public:
A (int);
A(int,int);
int get (int,int);
};
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Nov 4, 2013
Im supposed to create an to array of eight Circle objects initialized with the following radii: 2.5, 4.0, 1.0, 3.0, 6.0, 5.5, 3.5, 2.0. Then use a bubble sort to arrange the objects in ascending order of radius size before displaying the area of each object.
The error I get is "Cannot open include file: 'Circle.h': No such file or directory". Do I have to create a separate file for it?
#include <iostream>
#include <iomanip>
#include "Circle.h"
using namespace std;
class Circle {
public:
Circle()
[Code] ...
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Jan 3, 2015
I've got an error saying that there is an access violation at 0x0000040 error no 0xC0000005
I've searched the net, saying the error may be due to an uninitialzed variable.I debugged the code, and found out that an object created from directx D3DXMATRIXA16 is uninitialized.With values ??,??,?? in each element
pMeshContainer->pBoneMatrices = new D3DXMATRIXA16[g_NumBoneMatricesMax];
here, pMeshContainer is a variable passed into a function called GenerateSkinnedMesh by pointer
GenerateSkinnedMesh(..., D3DXMESHCONTAINER_DERIVED *pMeshContainer)
Then in turn, GenerateSkinnedMesh is called within a callback from a DirectX9 API called
ID3DXAllocateHierarchy
Code:
class CAllocateHierarchy : public ID3DXAllocateHierarchy {
public:
STDMETHOD( CreateFrame )( THIS_ LPCSTR Name, LPD3DXFRAME *ppNewFrame );
STDMETHOD( CreateMeshContainer )( THIS_
LPCSTR Name,
[code]....
when the method CreateMeshContainer finished execution, the meshContainer is passed back to its parent like this
*ppMeshContainer = pMeshContainer;
The whole meshContainer stuff is stored persistently inside the frame root wrapped within a class called CMesh So in that process, I haven't initialized pBoneMatrices in anyways. But what and where is the best way to initialize an array of DirectX9 objects.
There is a function called
D3DXMatrixIdentity(&...);
But how can I initialize each one of them with this call?
Notice that pMeshContainer->pBoneMatrices does contain a valid address, despite the fact that the elements inside it are never initialized...
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Oct 20, 2013
I need to search for a string in an array of objects, this is what I have but it does not seem to work, it always gives me the second string in the array instead of the one that i search for.
void binarySearch(Student S[], string name) {
int first = 0;
int last = 9;
int middle;
int position = -1;
bool found = false;
[Code]...
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Feb 4, 2014
I'm writing a periodic table program to understand classes. I want to be able to display/sort the elements by several properties such as whether it's a metal, nonmetal, or metalloid. I'm not sure hwo to do it, but my first guess was to create an array of objects; however, I'm having problems using my constructor to set the values.
Class
class Element{
public:
enum class groupNames { HYDROGEN, ALKALI, ALKALINE, GROUP_THREE, GROUP_FOUR, GROUP_FIVE,
GROUP_SIX, GROUP_SEVEN, GROUP_EIGHT, GROUP_NINE, GROUP_TEN,
GROUP_ELEVEN,GROUP_TWELVE, GROUP_THIRTEEN, GROUP_FOURTEEN,
GROUP_FIFTEEN, CHALCOGEN, HALOGEN, NOBLE_GAS,
[code].....
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Jan 24, 2013
I have written a selection sort algorithm to go sort an array of class objects by age in ascending order, the problem is that the output being given does not match what i think the code should do. when the program runs the 3 records are added to the array and when they are sorted should be outputed in ascending order, the problem is that with my code the last 2 are sorted properly but the first element does not seem to move, it remains the same as the original unsorted value.
My code for the selection sort function and the display method are below:
void selectionSort() {
int i, minIndex, minValue;
for (i = 0; i < (arrlength - 1); i++) {
minIndex = i ;
[Code].....
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Jan 22, 2013
I have a linear search algorithm set up to search through an array of class objects it works but the output does not match, when i search for a particluar name in the array the 1st and third values int the array are found but the second value is not found..
below is my code:
int linsearch(string val) {
for (int j=0; j <= 3; j++) {
if (player[j].getLastName()==val)
return j ;
[Code] .....
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May 15, 2014
Create an application to manipulate an array of student record objects. A student record will consist of a name (first, middle, and last), an ID number (9 numeric digits, cannot be more or less), an address (street, city, state, and 5 digit Zip code), and a phone number (3 digit area code and 7 digit number). The application will support an array of students. The user will be allowed to enter records from the keyboard, sort records by either name (last, first, middle) or by ID, save the records to a disk file (name supplied by user), and read the records from a disk file (name again supplied by user).
Create a fixed length string that must check that the length of the string is the required length. The fixed length class should be done as a template with the number of characters as the template argument. From this fixed length string, derive a class to hold digits of a fixed length.
Create component classes as necessary to use together to implement the student record class.
Use either the array template created in an earlier lab to handle the array or you may use the vector class from the STL to handle the array of student record objects.
The maximum number of students will be 25 (it may be less).
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Oct 28, 2012
What the best way to initialize a constructor in an array of objects?
Usually I declare an array of objects like so:
Code:
Car toyota[100];
Is this the only way I know to initialize a constructor of an array:
Code:
for (int i = 0; i < 100; i++)
{
toyota[i] = Car(x, y);
}
Is this the proper way?
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Nov 6, 2013
Im supposed to create an array of eight Circle objects initialized with the radii which is in the program. Also I must use bubble sort to arrange the objects is ascending order.
ERRORS:
'initializing' : cannot convert from 'double' to 'Circle'
'setRadius' : is not a member of 'Circle'
see declaration of 'Circle'
'findArea' : is not a member of 'Circle'
see declaration of 'Circle
#include "stdafx.h"
#include <iostream>
#include <iomanip>
using namespace std;
class Circle {
[Code] ....
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Dec 4, 2014
Basically for homework, we gotta make an array of payroll objects, using the general format I've made below...
I'm having trouble. The .dat file we are given to test looks like this:
40.0 10.00
38.5 9.50
16.0 7.50
42.5 8.25
22.5 9.50
40.0 8.00
38.0 8.00
40.0 9.00
44.0 11.75
When I execute the program, it shows the first column of objects, but will always replace the 2nd column values with a 0.
It's definitely NOT reading that column, and using the constructor to set it to zero. I don't know why it's not reading that column though...
(TL;DR.... Currently it reads "Employee #1: 40, 0" rather than "Employee #1: 40, 10.00"... etc)
Here's my code.... (not 100% done yet just testing datafile output atm)
#include <iostream>
#include <fstream>
using namespace std;
class Payroll {
private:
double payRate; // holds an employee hourly pay rate
[code]....
I want it to read the other column without giving me zero />
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