C/C++ :: Overload Operator With Friend Function Using Constructors

Dec 26, 2014

I want to overload prefix and postfix increment(++) operators with friend function. I also have to use the constructors for this. How can I do this? in C++

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C++ ::  Operator Overloading Using A Friend Function

Jul 24, 2013

What is the role of friend function in this program? Is it even executed here?

#include <iostream>
using namespace std;
class loc {
int longitude, latitude;
public:
loc() {} // needed to construct temporaries

[Code] ....

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C++ :: Dealing With Operator Overload Function Failure

Aug 23, 2014

Say I have a class that requires dynamic allocation to implement a few of the operators. Take "+" for example; I need to create a new object to hold the sum of the two parameters whose size is not known at compile time.

I'm pretty sure the standard way to indicate a failure inside the overloading function would be to throw an exception. However I am currently involved in an embedded(ish) project where the spec. says no exceptions are to be used.

I think I have 2 options:

1. Return an "invalid" object (with a flag indicating an error has occurred) and check for this after each operation.

a = b + c
if (a.err)
// handle error
or

2. To forsake operator overloading entirely and think up a new way of doing things where all functions that involve dynamic allocation can return error codes. but this seems rather terrible too as I may end up with something like:

objA a
if (add(&a, b, c) == -1) // assuming b and c are initialized before this snippet starts
// handle error

Is there a number 3 that I haven't thought of? It seems that not allowing exceptions is fairly common even in the non-embedded world [URL] so how is this normally done? or is operator overloading usually avoided when exceptions are not allowed?

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C/C++ :: Overload Two Different Operators One Inside Class And Other Outside Using Friend

Nov 23, 2014

I'm trying to understand the basics of oop ...

#include <iostream>
using namespace std;
template <typename T>
class max_vector {
private:
T* elemente;
int lungime;

[Code] ....

The purpose of this program is to overload two different operators one inside the class, and the other one outside using friend. The problem is that i get 1 error at the '*' one.

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C++ :: Write Prototype Of A Member Function To Overload Insertion Operator

Apr 10, 2014

Consider the class specification below. Write the prototype (i.e. header) of a member function to overload the insertion operator (i.e. <<). The << operator is to output the data members of an instance of class StudentTestScores into an output stream. Your definition should allow for chaining of output operations (e.g. cout << x << y; where x and y are of type StduentTestScires).

#include <string>
using namespace std;
class StudentTestScores{
private:
string studentName;
float *testScores; // used to point to an array of test scores
int numTestScores; // number of test scores

[code]....

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C++ :: Namespaces / Classes - Perform Operator Overload With Insertion Operator

Mar 22, 2013

I'm doing a refresher for C++ and have gotten to operator overloading. I'm trying to perform an operator overload with the insertion (<<) operator, but I have encountered a problem.

Here's my class [In a header file "Shinigami.h"]

#include<string>
namespace K{
class Quincy;
class Shinigami{
friend std::ostream& operator<<(std::ostream&, const Shinigami&);

[Code] .....

If the operator function is a friend of the 'Shinigami' class, why doesn't it recognize any of it's private members? I need it to be in this file because I'm doing a bit of association with the 'Quincy' class.

I thought it was the namespace, but I included that.

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C++ :: How To Specialize Template Friend Operator

Jul 13, 2012

Can't quite seem to get this figured out...

Code:
template <typename T>
class Foo {
public:
Foo(const T& t) :
t(t)

[Code] ....

I can't provide a generic implementation of the << operator, it depends on the specific types of T. So how do I specialize the operator for a specific type T ?

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C++ :: Operator Overloading And Friend Functions

May 3, 2013

Can an overloaded operator be a friend function?

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C++ :: How To Overload Operator Twice

Jul 10, 2014

Here's my question. I'm coding a basic Linked List class (for the purpose of understanding and having fun, I know about STL), LList.

I have overloaded the [] operator so it returns the data of the index-th node in the list, for example, if I code

LList x;
....
cout<<x[5];

it prints the data of the 5th node in the list (for fun I decided to index from 1 to infinity).

My question: Now I want to be able to assign the value to the index-th node data, using [] and =, for example, I want to be able to write:

LList x;
.....
x[5] = 121;

How can I do that?

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C++ :: How To Able To Overload A Multiplication Operator

Apr 24, 2014

How would i be able to overload a multiplication operator that if, in the main example(0, 5, 0) * example (0, 5, 0) is given, it gives me 25?

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C++ :: Overload Delete Operator With Specific Arguments

Sep 27, 2014

We're trying to overload the delete[] operator with specific arguments. Which is the right way to call it? We use the GNU compiler and obtain compiler errors with all of these samples:

#include<iostream>
using namespace std;
typedef unsigned int P;

[Code]....

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C++ :: Union Of Two Vector ADT Bags - Operator Overload

Apr 30, 2014

I'm trying to come up with the union of two Vector ADT bags, so I have to overload the '+' operator, but I'm getting a bunch of error messages saying:

VectorBag.cpp: In instantiation of ‘VectorBag<ItemType> VectorBag<ItemType>::operator+(VectorBag<ItemType>) [with ItemType = int]’:
proj2.cpp:161:42: required from here
VectorBag.cpp:81:24: error: no match for ‘operator[]’ (operand types are ‘VectorBag<int>’ and ‘int’)
newBag.add(anotherBag[i]);
^
Here is the function to overload the operator:

template<class ItemType>
VectorBag<ItemType>
VectorBag<ItemType>::operator+(VectorBag<ItemType> anotherBag) {
VectorBag<ItemType> newBag;
for (int i = 0; i < anotherBag.getCurrentSize(); i++)
newBag.add(anotherBag[i]);
}

The add() function is pre-defined by me somewhere else in the code. It basically does push_back().

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C++ :: Call Text File In Input Overload Operator?

Nov 12, 2013

i am doing some practice problems and i can't seem to figure out how to do this. basically we have a students number of test scores, then the name followed by the scores they have in a text file. Then we have to make a class with a constructor, copy constructor, destructor, and overload the = operator and the input and output operator. Are we suppose to call the text file in the input overload operator?

Here is what i have so far.

This is my header file.

#ifndef STUDENTTESTSCORES_H
#define STUDENTTESTSCORES_H
#include <string>
#include <iostream>
using namespace std;
class StudentTestScores{
private:
string studentName;

[Code]...

i am 100% sure the overloading the input is wrong

here is the implementation of the constructor copy constructor and desctructor

#include <iostream>
#include "StudentTestScores.h"
using namespace std;
StudentTestScores::StudentTestScores(string name = "", int numScores = 0)
{
studentName = name;
numTestScores = numScores;
if (numScores <= 0)
testScores = NULL;
else

[Code]...

and here is the notepad file

3
Justin Bieber491.469.184.681.081.5
Miley Cyrus380.080.090.083.3
Kim K490.575.661.481.677.2

The program is suppose to use all the information and read from the notepad and output the exact things as the notepad file

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C++ :: Overload Operator With Stack That Implements Linked List

Nov 10, 2013

struct Node {
int entry;
Node *next;
Node(); //1
Node(int item, Node *link = NULL); //2

[Code] .....

Implement: 1 2 3 4 5
and overload operator <<, >>, =

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C++ :: Error When Using Volatile Object In Overload Assignment Operator

Jul 27, 2012

/*using GENERIC_COMMAND* A; as volatile generates error. but here i have to use union object as volatile i.e. volatile GENERIC_COMMAND* A; */

#include <iostream>
using namespace std;

typedef unsigned int uint32_t;
typedef unsigned long long uint64_t;
union GENERIC_COMMAND {

[Code] .....

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Visual C++ :: Operator Overload Not Defined Error When Type Accessed Through Const Struct

Oct 17, 2012

I have a basic vector/point class where I've overloaded a bunch of arithmetical operators:

Code:
#pragma once
class point {
public:
point() {
}
point(float p_x, float p_y, float p_z) : x(p_x), y(p_y), z(p_z)

[Code] ...

I can use it fine like

Code:
point p(50,50,50);
point q(50,50,50);
point t = p * q + q;

However when I put this point type into a struct and try to access the members after passing it through by const reference:

Code:
struct sextic {
point a,b,c,d,e,f,g;
};
inline static sextic sexticDifference(const sextic &p_sextic1, c

[Code] ....

This gives me an "operator not defined" error for compilation.

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C++ :: Does Prototype Of Friend Function Has No Value?

Mar 30, 2013

[URL] ..... Prototype is commented.

[URL] ..... Prototype is included.

both give the correct output. Why?

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C++ :: Can A Friend Function Work For Two Classes?

Mar 23, 2013

If yes then how?

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C++ ::  Friend Function Can't Able To Access Private Member

Jan 21, 2015

Am trying to write table object into file. Here's the source code

.hpp file

class Table {
private:
int table_no;
std::string table_type;
bool engaged;
std::time_t start_time;
double total_sec;

[Code] ....

When i compile the above code i get the following error...

table.hpp: In function ‘std::ifstream& operator>>(std::ifstream&, Table&)’:
table.hpp:19:7: error: ‘int Table::table_no’ is private
table.cpp:91:12: error: within this context
table.hpp:20:15: error: ‘std::string Table::table_type’ is private
table.cpp:92:12: error: within this context ...........

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Visual C++ :: Friend Class And Pointer Function

Mar 9, 2013

I need understanding this block of code, particularly this line : *getLeftChild() { return this - _child; }

Code:

public class UpperNode {
BOX _box;
int _child;
FORCEINLINE UpperNode *getLeftChild() { return this - _child; }
...
};

Here I have this function:

Code:
void
UpperNode::visulization(int level) {
if (isLeaf())
_box.visulization();
else
if ((level > 0)) {

[Code] .....

It also makes calls for "getLeftChild()";

But I see that getLeftChild expects function pointer, and I absolutely have no clue where "this" comes from inside function body.

(return this - _child) - "this" has to be integer.

Or, if we gave pointer, and "this" is referring to some UpperNode, then I can't understand to which one, I have no UpperNode array defined or something. So if this functions is actually scaling pointer address, then scaling where to? I could comprehend it, if I had some array of UpperNodes, but not just class. I have UpperNodes array defined in other friendly class, but don't think they are related .....

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C++ :: Overload With Template Function

Nov 15, 2013

I am a beginner, got confused about:

template<typename T> int compare(T &a,T &b);
int compare(const char *a,const char *b);
char ch_arr1[6]="world",ch_arr2[6]="hello";
compare(ch_arr1,ch_arr2);

After running the code above,we got to know the non-template function is called. What I know is that the array arguments ch_arr1,ch_arr2 will not be converted to char * because the parameters are references in the template functions.

ch_arr1,ch_arr2 need to be converted to const char * if compare(const char *a,const char *b) were called.

I just wanna know what exactly happened behind that? and why?

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C++ :: Possible To Overload A Class For Passing To A Function

Feb 1, 2014

I want to be able to do

someFunction(MyObject)

rather than

someFunction(MyObject.getWhatIWant())

I know I can do &MyObject, MyObject() and MyObject[0] by overloading operators but is it possible with just plain old MyObject?

this is assuming that I have no access to someFunction(), i.e, it cannot be modified.

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C++ :: Overload Template Function In A Class?

Jun 21, 2013

Firstly, is it legal to overload a template function in a class? This is what I did

class FILE_txt
{
public:
FILE_txt(const char* );

[Code]....

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C++ :: Define To Overload Virtual Function

Jul 11, 2014

I want to overload pure virtual function from 3rd party SDK class to put my debug messages like that:

errorStatus aXsaction(){printf(_T("
abort transaction"));transactionManager->abortTransaction();}

#define transactionManager->abortTransaction() aXsaction()

But compiler complains on the minus sign:
error C2008: '-' : unexpected in macro definition

Is it possible to trick the compiler?

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C++ :: Overload Virtual Member Function In Polymorphism?

Nov 30, 2013

I defined a virtual class and three other classes based on it. I want to use them like this:

int main() {
Dirichlet_t D;
Neumann_t N;
Cauchy_t C;

PDEBoundary_t * B1=& D;
PDEBoundary_t * B2=& N;
PDEBoundary_t * B3=& C;

[Code] .....

but I got two major errors
1: "object f abstract type is not allowed" error.-----why not?
2: "the derived class must implement the inherited pure virtual method"-----Did't I?

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Visual C++ :: Circular Buffer - No Instance Of Overload Function Matches Argument List

Nov 25, 2014

I'm having some issues with my code. For the produce function i am getting an error saying 'no instance of overload function produce() matches the argument list' and also for the lines buffer[head].data = message; buffer[head].time = current_time i get an error saying 'expression must have pointer to object type.

In the code i'm not sure if i passed the variables to the function correctly. I have attached the code .....

code produce.txt

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