C++ :: Delete All Parent Methods Of A Given Name?

May 7, 2013

I'm writing a sorted vector implementation and trying to do it as simply as possible.

Right now, I'm declaring the sorted vector with a protected subclass of vector, then using the "using" keyword to explicitly inherit all methods that aren't related to adding new elements to the vector (so I can control the order).

Eg:

Code: template<typename T, class Cmp = std::less<T>>
class sorted_vector : protected std::vector<T>{
public:
typedef typename std::vector<T>::iterator;
using std::vector<T>::operator=;
using std::vector<T>::assign;
using std::vector<T>::get_allocator;
using std::vector<T>::at;
using std::vector<T>::operator[];
//...
};

Obviously, this is annoyingly redundant. So what I'd like to do is something using the new "delete" keyword from C++11. Is there any quick, expressive way of deleting specific methods?

Also, it's pretty annoying to have to typedef base_class::type type to inherit a type from a base class. Is there a shorter way to do that?

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C :: List - Why Delete Function Doesn't Delete

Dec 9, 2014

I have to manage a Clinic. I need to delete a booking (for example, if John said he's coming on March 22nd at 15:30 but then he say he's not going to come, I have to delete that booking so another person can use it).

idSearched: the id of the person that is not going to come. I have a lot of specialties and each one has a list. So I ask for the speciality to delete the node (the node contains John's booking). If I don't find it, I return (-1). searchSpecByID return a pointer to the list where the speciality is. So head will point to the first node of the list. In nodeToDelete I have the node I want to delete.

The program detects OK when is the first in the list and when not, but it doesn't delete the node.

Code:

typedef struct bookingList{
tSpecialty specialty;
struct nodo* intro;
} tList;

[Code].....

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C++ ::  Virtual Methods With MI

Jan 6, 2014

I have questions about multiple inheritance and virtual methods. I have a class called solid. All objects of this class have hitboxes and can collide with others. I have the following methods:

void testCollision(something begin, something end);
/* This method takes a container's begin and end iterators to test if the object collides with any other object of the list of all the solids currently in the game area. Each time there is a collision, it calls collide(other) and other.collide(*this) */

virtual bool collide(solid& other);
/* This method always returns false and does nothing */

This class will be inherited by another class which will have overloads for a few specific collisions. For example:

class player : public solid{
public:
bool collide(projectile& other);
bool collide(enemy& other);
bool collide(wall& other);
};

My question is quite simple actually. If I have a loop which calls testCollision() with all elements in the list of all solids (a list of pointers to solids to be exact) and there is a collision between the player and a projectile, will testCollision call player::colide(projectile& other) or will it call solid::collide(solid& other). And in any case, did I understand how to use the virtual keyword? If I'm right, it should call the player::colide method if it's there for the specific type, else it will call the solid::colide which only returns 0, ignoring collision.

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C++ :: CPP File With Methods

Feb 15, 2012

I have h-file with definition of 3 classes. And cpp-file with realization methods of this classes. And when I compile the project errors - LNK2019 is apperead... How make that methods become visible?

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Visual C++ :: How To Set The Parent Dialog

Apr 17, 2013

I've created a modeless dialog from my main dialog as follows:

Code:
m_pContainerDlg = new CDlgContainer(NULL, this);
m_pContainerDlg->Create(CDlgContainer::IDD, GetDesktopWindow());
m_pContainerDlg ->ShowWindow(SW_SHOW);

This container dialog creates a child dialog which I show inside the container

Code:
BOOL CDlgContainer::OnInitDialog(){
// Create the child dialog and show it
m_pChildDlg = new CChildDlg(this);
m_pChildDlg->Create(IDD_DIRECTORY_DIALOG, this);
return FALSE;
}

From my child dialog I then create a modal dialog when a user clicks on a button

Code:
CChildDlg:: CChildDlg (CWnd* pParent /*=NULL*/) :
m_pParent((CDlgContainer*)pParent), {
} void CChildDlg::OnBnClickedBtn() {
CMyDlg MyDlg;
INT_PTR iResult = MyDlg.DoModal(pParent);
}

My problem is that the CMyDlg is modal but to the main dialog and not to the container or the child dialog.

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C++ :: Accessing Setter Methods

Nov 21, 2013

How to i access setter from within a setter?

I know that getter methods can be access like

Code: getAccounts().getAccountNumber();

// for example but for setters how do i do it? this doesnt seem to work though

Code: setAccounts().setAccountNumber(accountNumber);

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C# :: Package Methods In Struct

Oct 20, 2012

Is it common practice to package methods with other elements(string-s, int-s, float-s, array-s...) of struct?

Than struct acts as a class or is acting similar to class and that have no sense to me? I am new to OOP .

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C++ :: How To Call Methods Of Class

Feb 27, 2014

how to call the methods of the class.I have an object call v which is an array and I don't how to call the methods of the class. The error is here:

v.readDates(v[a]);

#include "Date.h"
#include <iostream>
using namespace std;
int main(){
int a;
cout << " HOW MANY DATES DO YOU HAVE? " << endl;

[code]....

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C++ :: Add And Overwrite Class Methods Through Lua

Oct 9, 2013

I'm using lua 5.2.2 with luabind 0.9.

I'd like to be able to add additional class-methods through lua for any classes that I've bound in c++, but I'm unsure how to do it.

The problem is that luabind uses a function as the __index-metamethod for any bound classes instead of a table, so I don't see a way to access the class-methods at all.

e.g., I'm binding my classes like this:

luabind::module(lua) [
luabind::class_<testClass>("TestClass")
.def(luabind::constructor<>())
.def("TestFunc",&TestFunc)
];

What I essentially want to do is to add a lua-function to the list of methods for this class, and be able to overwrite existing ones:

local t = tableOfClassMethods
local r = t.TestFunc -- Reference to the c++-function we've bound
t.SomeFunction = function(o) end -- New function for all objects of this class
t.TestFunc = function(o) end -- Should overwrite the c++-function of the same name

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C++ :: Using Tea Algorithm Methods From Wikipedia?

May 8, 2013

i have been trying to call out the tea algorithm from wikipedia. However i keep getting a segmentation fault. Am i calling it out the wrong way? Below are the snippets

methods taken from wikipedia

void encrypt (uint32_t* v, uint32_t* k) {
uint32_t v0=v[0], v1=v[1], sum=0, i; /* set up */
uint32_t delta=0x9e3779b9; /* a key schedule constant */
uint32_t k0=k[0], k1=k[1], k2=k[2], k3=k[3]; /* cache key */
for (i=0; i < 32; i++) { /* basic cycle start */
sum += delta;

[code]....

i tried to encrypt a test text and casting it to the uinstd32_t type. However it always gives me a segmentation fault.

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C++ :: Difference Between Methods And Objects?

Feb 2, 2014

What is a method and what is an object?

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C++ :: How To Redefine A Constructor From Parent Class

Jul 14, 2014

Firstly I don't really know if this is possible.

This is my Class Diagram: [URL]...

github: [URL]...

I want to redefine the price object of the Book Class. However price is defined at Products Class.

I want the price value change according to the marker value, which is a Book attribute.

If the marker is blue, price gets a value of 10 (e.g.), if it has another value, price is equal to 20.

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C++ :: Composition - Can't Use Set Function Of Parent Class

Apr 5, 2013

From parent class, I mean the class whose obj has been made in the class after that.

#include <iostream>
using namespace std;
class a{
int x,y;
public:
a(int u = 0, int v = 0);
void setXY(int,int);

[code].....

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C# :: Picturebox Size In Parent Container

Aug 22, 2014

I have a picture box, inside a table layout panel. The default size for the picture box is 456, 457. However, what I want to do is have the picture box be the size of the available area, even if the form is full screen.

I have the picture box dock set to fill etc. but not matter what I do, it refuses to change the dimensions from the ones above.

The only work around I could find that worked was this:

this.pbMainMap.Size = new Size(Screen.GetWorkingArea(this).Width, Screen.GetWorkingArea(this).Height);

Which is pretty useless if you are using a table layout panel. Can I grab the dimensions from the cell I am in or something?

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Visual C++ :: Control On Parent Window

Feb 18, 2014

I need Edit Box and List Box controls on the Parent Window or Main Window of my application. I know how to use them in dialogs ..

I will need to Read/Write/Modify data from Edit Box . How to do this ?

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C++ :: Creating Methods For Class List?

Jul 3, 2013

Creating the methods for class List

main.cpp Code: #include "List.h"
int main( )
{
List la; // create list la
la.push_front( "mom" );
la.push_back( "please" );
la.push_back( "send" );
la.push_back( "money" );
la.push_front( "hi" );
cout << "
la contains:
" << la << '

[code]...

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C# :: Are Methods Stored In Heap Or Stack?

Jan 29, 2012

I know that memory addresses in the stack can contain either values or references to other memory addresses, but do these memory addresses also contain methods or are the methods themselves located in the heap?

The confusion comes from the fact that in C# a delegate variable can be assigned either a method's identifier, an inline function, a lambda expression, or a new instance of the delegate type with the method's identifier passed as an argument to the constructor. My guess is that assigning the method's identifier directly to the delegate variable is just a simplified way of calling the delegate type's constructor with the method's identifier as an argument to the parameter, something that the compiler handles for you.

But even in this last case, the delegate variable is said to point toward the method itself. In that case, does it mean that methods are stored in the heap, just as reference type values are?

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C++ :: Override Few Methods In FILE Class

Oct 30, 2013

I need to override a few methods in FILE class so i defined few methods as

EnCrpt * fp;
fp * fopen(const char * filename, const char * mode);
int fwrite(const void * p,int length,int readLenth,FILE * fpp = NULL);
int fread(void * p,int length,int readLenth,FILE * fpp = NULL);
int fseek(FILE * fpp = NULL,long offset, int whence);
long ftell(FILE * fpp = NULL);
int feof(FILE * fpp = NULL);
int fflush(FILE * fpp = NULL);
int fclose(FILE * fpp = NULL);

I will call fread method in my encrypted file class .. similar to other methods.. is this correct ? can NULL file pointer create issue ?

Because i have so many place where FILE class called i don't want to change everywhere to call encrypted file class so i am override these methods to encrypted file class instead of standrd FILE class

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C++ :: How Are Members Accessed In AMP Restricted Methods

May 17, 2013

Suppose I have a class "A", which has a method "void AMP_call()" that calls paralel_for_each in which another method, "float amp_function(float) restrict(amp)". When I call that method, can it then use members of "A"?

class A {
void AMP_call();
float amp_function(float) restrict(amp); // do something on a device
float allowed_variable;
std::vector<bool> not_allowed;

[Code] ....

Another way to frame my question, perhaps to make it easier to understand what I am after, would be that I want to know what happens if an amp-restricted method is called where the body of the class itself (which is not amp-compatible and afaik doesn't have to be since it's not passed to the device) may contain members that are not amp-compatible.

All of the msdn blogs I could find deal with which functions and methods can be called from within a parallel_for_each loop, but not with which variables are available to the lambda function itself.

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C# :: Windows Form Applications Using Methods?

Sep 30, 2014

I need to write a windows form application that allows the user to enter a credit card number and credit card type and then determines whether it is a valid number using the following rules:

1.) the first number is:

a. 4 for visa
b. 5 for master card
c. 37 for american express
d. 6 for discover

2.) passes the mod 10/ luhn check, which is calculated as:

a. from right to left, multiply every other digit by 2. when doubling a digit results in a two digit number, add the numbers to get

a single digit. ( like 6 * 2 = 12 therefore 1 + 2 = 3).

b. add all the single digits from 2a

c. add all the odd places from right to left in the card number

d. sum the results fro steps 2b and 2c

e. if the resulting number in 2c is divisible by 10, the card number is valid otherwise it is invalid.

The chapter is introducing methods so that is the main thing i will be using for each step.

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C# :: How To Combine 2 Methods To Make SQL Class

Jun 17, 2014

I am given 2 methods and they want me to create a stand alone class for sql that will change the sql string.

my question is how can i take these 2 methods and make one class out of them that will used on various other forms.

#1

public string AuthenticateWithDB(CUiPontisDatabaseSpecification pdb, string sUserId, string sPassword,
bool bCreatePersistentCookie)

#2

public static void ChangeConnection(Util.ODBC.ODBCDSN odbcInfo, CPonDatabaseVendorType dbType, string uid, string password)

they want it so they can use it like

CUiHttpSessionManager.SimpleDataConnectionString = SomeNewClass.CreateSimpleDataConnectionString()

where some new class is my new class

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C++ :: Template Classes And Inline Methods

Aug 17, 2012

I have a template class which defines a few heavy methods. For now, they are defined in the same .h file as the class definition, but i`d like to have them in a separate .cpp file.

A situation i find you describe in the FAQs arises: [URL] ....

Problem: the export keyword has been deprecated in c++0x, if i recall correctly, and has never been implemented in any of the compilers i am using (msvc, gcc).

#Including the the .cpp file after the class definition (as described in the second post of the FAQ) works.

another question: i have methods that dont use any template code. Can i somehow declare them as such? (more of an esthecial question, which would make it easier to distinguish between template and non.template code).

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C++ :: Overriding Virtual Operator Of Parent Class

Mar 20, 2013

Below is simplified code consists of two classes, namely Parent and Child.

Child is inherited from Parent.

All member functions of class Parent are declared virtual, and they have been overridden in the class Child.

Code 1:

#include <cstdlib>
#include <iostream>
using namespace std;
#define QUANTITY 5
class Parent {

[Code] ....

The output of the code:

Child::showID() -- ID is 1804289383
Child::showID() -- ID is 846930886
Child::showID() -- ID is 1681692777
Child::showID() -- ID is 1714636915
Child::showID() -- ID is 1957747793

Parent::operator=() invoked.

Child::showID() -- ID is 1804289383
Child::showID() -- ID is 846930886
Child::showID() -- ID is 1714636915
Child::showID() -- ID is 1714636915
Child::showID() -- ID is 1957747793

Question:

Why is Parent::operator= invoked instead of Child::operator= ..?

Isn't it already declared virtual and hence would be overridden..?

I need to invoke Child::operator= instead. How to achieve this?

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C++ :: Multiple Constructors Calling Parent Constructor

Dec 6, 2013

I have a class that extends another class, and I want multiple constructors in the child class, but the child constructor needs to call the parent constructor. This is what I have

In the child class:

ChildClass::ChildClass() {
ChildClass(1);
}
ChildClass::ChildClass(int i)
: ParentClass(i) {
// do stuff
}

In the parent class:

ParentClass::ParentClass(int i) {
// do stuff
}

In my main program:

ChildClass child1;
// do stuff with child1
// breaks
ChildClass child2(1);
// do stuff with child2
// works fine

Using the default constructor breaks my program at runtime, but using the one with a parameter works fine. The default constructor calls the other with the same thing as the main part in the program, so I would think this should make no difference, but obviously that isn't the case.

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C++ :: Bone Parent Indices To Linked List

Jul 6, 2014

I have an array of bone parent indices (as intgers), where root bone is tagged as -1, bone can have only one parent. At some point i need to traverse thru all children of some arbitrary bone (leaving others untouched) but this seems tough to do with this setup.

I cannot come up with algorithm to create linked list like hierarchy from this , with old DX9 API in their animation system we have structure like this:

struct D3DXFRAME { // bone
... // some irrelevant data members
D3DXFRAME* pFrameSibling;
D3DXFRAME* pFrameFirstChild;
};

Where I can simply use recursion to achieve what I want.

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C/C++ :: Two Way Communication Between Child And Parent Processes (pipes)

Mar 19, 2014

I want parent and child processes to communicate in C linux using pipes. I have created two file descriptors. one for parent to child i.e. readpipe and other writepipe for viceversa. But I am getting null as output for ch and ch1 strings in my code below.

#include <stdio.h>
#include<stdlib.h>
#include
#include<unistd.h>
int main(){
pid_t pid;

[Code] .....

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