C++ :: Implementation Of Named Class

Sep 12, 2014

I am trying to implement some kind of named class. It would look something like this:

class MyClass {
virtual std::string getName() = 0;
};

And now (what doesn't pass the compilation)

template <std::string NAME> class MyNamedClass {
std::string getName() { return NAME;}
};

And so every time I would like to have a class with a name, I could just do the following:

FinalClass : public MyNamedClass<"FinalClass">{};

The idea is not to have to always reimplement getName(), and just do it concisely in the declaration.

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C++ :: Class Has No Member Named Function?

May 19, 2012

I keep getting an error saying ui.h:30: error: 'class BTree<Word>' has no member named 'prntInOrder'
I have no line 30 in my ui.h but if i count the lines from the .cpp as if they were attached to the .h i find the call to the BTree printInOrder()

here is my ui.h

Code:
#pragma once
#include "btree.h"
#include <fstream>
#include <iostream>
using namespace std;

[Code].....

As you can see the printInOrder() function is there so would it not see it?

Error:

Code:
ui.h: In member function 'void UI::go(std::string)':
ui.h:30: error: 'class BTree<Word>' has no member named 'printInOrder'

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C/C++ :: Multiple Class Implementation Files?

Apr 14, 2014

I have attached my code below and I am stuck in what to do next to make an instance of the dateCls so I can use the instance to assign the open date. By instance I mean like create an instance of the class, like this: dateCls myFirstInstance; And everything in the dateCls I can access through the . operator. So far my code looks like this..what I should do? Lastly, I am using derived data from I think the bankAccountCls.

I need the main program to output this data:

dateCls openDate(01, 03, 2012, "open date");
saveAccountCls s1("1001", 300.50, 0.12);
s1.setDate(openDate);
s1.print();
s1.deposit(100, 01, 05, 2012);
s1.print();
s1.withdraw(50, 01, 10, 2012);

[code]....

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C/C++ :: Finding The Right Class Hierarchy Implementation?

May 29, 2013

code:

    class BM_FONT_CALL BMfont  {
    public:  
    BMfont();
    ~BMfont();  
    bool Load(const std::string& fontName);
    void Print(float x, float y);  
    class BM_FONT_CALL BMstring : public std::string
 
[code]....

How can I do `BMstring` have an access to `BMfont`'s members, as if `BMstring` will not inherit `BMfont`'s members? For example, if I do this:

    BMfont::BMstring text;
    text.scale //I don't want this  

What I want to do here is, I want the `BMstring::Compile()` to have an access to `BMfont` with no any instance of `BMfont` inside `BMstring`.

Or what if I do this:

    class BM_FONT_CALL BMstring : public std::string {  
        std::function<void (void)> func;  
    public:  
        BMstring() { func = BMfont::Compile(); }  
    }  

By making the `Compile()` member of `BMfont`.But this won't compile. How can I achieve this?

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C++ :: Linked List Class Node Implementation

Mar 26, 2014

I am studying this sample code for linked list class node implementation. I am not 100% sure how this code keeps track of the head node. Here's what I know so far, and if you want to add/correct anything feel free to do so:

class Node {
public:
Node(); // constructor of class node without arguments
Node(int, Node*); //constructor with arguments of int type and a pointer node type
Node* next() const;
void setNext(Node*); //member fun, returning a pointer of node type
void setKey(int);

[Code] ......

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Visual C++ :: Class Specification / Implementation File

Oct 2, 2013

I keep getting this error

In file included from /usr/lib/gcc/i686-redhat-linux/4.5.1/../../../../include/c++/4.5.1/bits/ios_base.h:43:0,
from /usr/lib/gcc/i686-redhat-linux/4.5.1/../../../../include/c++/4.5.1/ios:43,
from /usr/lib/gcc/i686-redhat-linux/4.5.1/../../../../include/c++/4.5.1/ostream:40,
from /usr/lib/gcc/i686-redhat-linux/4.5.1/../../../../include/c++/4.5.1/iostream:40,
from player1.cpp:3:
/usr/lib/gcc/i686-redhat-linux/4.5.1/../../../../include/c++/4.5.1/bits/locale_classes.h:45:1: error: expected unqualified-id before "namespace"

What does it mean? I am working on classes and this error comes when I run the implentation of my class file.

//Implimentation of class player1 (player.cpp)
#include "player1.h"
#include <iostream>
//using namespace std;
void player1 :: Set_Name()

[Code] ...

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C++ :: Rational Number Class Implementation - Overloaded Operators

Sep 13, 2013

I'm implementing a rational number class:

#include <iostream>
#include <stdint.h>
using namespace std;

typedef int64_t RAT_INT;
struct RAT{
RAT_INT Num, Den;

RAT(RAT_INT num = 0, RAT_INT den = 1){
Num = num;
Den = den;

[Code].....

Two questions:
1) In the second line in main, how does C++ know to convert 2 to the appropriate RAT?
2) Is it possible to make the third line in main valid without adding global operators for all the member operators to support plain integers?

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C++ :: Implementation Of Array Index Operator For Fraction Class

Jan 7, 2014

I need an implementation for the array index operator overloading of my Fraction class . The Fraction.h looks like :

#include <iostream>
using namespace std;
class Fraction {
public:
Fraction(int = 1, int = 1);

[Code] .....

I am not able write the Array index operator overloading functions.

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C++ :: Splitting Template Class To Header H File And Implementation CPP File

Sep 12, 2014

What is the right syntax for implementing the .cpp of a template class?

Consider this LinkedList.h file:
Code: #include<iostream>
#include"Iterator.h"

template <class T>
class LinkedList {

[Code] ....

How should the implementation for the LinkedList constructor, for example, should look like in the LinkedList.cpp file?

I tried this:

Code: #include "LinkedList.h"
template <class T>
LinkedList<T>::LinkedList<T>() {
// constructor
}
LinkedList<T>::~LinkedList<T>() {
// destructor
}

But the compiler wouldn't accept it.

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C++ :: Named Parameter Idiom?

Sep 8, 2013

What is the "Named Parameter Idiom" in c++?

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C++ :: Use Named Constant For The Price Of T-shirt?

Oct 5, 2014

I've go this code that I need to use a Named Constant for the price of a t-shirt.

I've already done the code from a previous lab for college and I'm not sure how to proceed.

Here is the code:

int main()
{
int tno, price=12,cost;
float discount;

[Code].....

not asking to have this done for me just a hint at where to put the Named Constant

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C++ :: Why Cannot Dynamically Allocated Variables Be Named

Mar 25, 2013

I understand why you cant define them but why cant you name them. Or is it that you must always define them in order to name them?

Why do I have to always use a pointer???

Or is it that dynamically allocated variables on allocate space for a type to be stored and not really the variable itself so you must use a pointer???

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C/C++ :: Error Header Has No Member Named Size

Dec 1, 2014

Was missing the '.s'

I'm getting this error in the 'my_free' function here "bp->s.size += p->s.ptr->s.size;" and "p->s.size += bp->s.size;" here. This doesn't make sense to me because it seems to be the correct way to access the union, and In the "my_malloc" function I use a similar call "p->s.size = nunits;" and that works fine.

// gcc -o malloctest -Wall -g -ldl main.c
// ./malloctest
#include <stdbool.h>

[Code].....

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C++ :: Open File Named In Unicode Characters

Sep 22, 2012

How to open a file which its name is unicode letters ? usually :

Code:
basic_ifstream<wchar_t> src("source.txt");

Work well to read file with unicode content not filename, so that example doesn't work :

Code:
basic_ifstream<wchar_t> src(L"source.txt");

Also, I have seen some alternatives for using open function but it doesn't work as well.

Code:
basic_ifstream<wchar_t> src;
src.open(L"source.txt");

I use g++ compiler.

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Visual C++ :: No Member Named Stoi In Namespace Std

Oct 20, 2013

I am trying to test out stoi() function found in the link below.

[URL] ....

but I got the error "No Member named stoi in namespace std." ...

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C++ :: Sending Dynamic Allocated 2D Array Over Named Pipe Between 2 Executable

Oct 6, 2014

Im writing a scientific software where I like to sent a 2D array (5x4) over a named pipe from a server to a client. When im sending a static array (i.e., double res[5][4];), all goes fine and it works perfect, but when I allocate a dynamic array, it provides some nonsense numbers at the client side. I feel it might be caused because I point to a memory that cannot be shared through a pipe. Am I right and how can I pass the dynamic allocated array itself over the pipe.

//Server program

// Create a pipe to send/receive data
HANDLE pipe = CreateNamedPipe(
"\.pipemy_pipe", // name of the pipe
PIPE_ACCESS_DUPLEX, // 2-way pipe -- send and read
PIPE_TYPE_BYTE, // send data as a byte stream
1, // only allow 1 instance of this pipe
0, // no outbound buffer

[Code] .....

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C++ :: Saving And Recovering A File Named By User-entered Parameter

Apr 7, 2013

1. How can I save a text file using a parameter which the user entered?

For example, the user enters the word "Johnny". The program will create a new text file "johnny.txt"

2. How do I search the directory for a text file after the user entered a keyword?

For example, the user enters the word "johnny". The program will search the directory and recover the text document "johnny.txt".

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C++ :: Effect On Output Of Program Of Different Numbers Input To Int Data Type Named

Mar 2, 2014

// this program gives random number output
#include <iostream>
#include <cstdlib>// contains function protype for rand
#include <iomanip>// for setw
using namespace std;

[code]....

what is the effect on output of program of different numbers input to the int data type named seed*/

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Visual C++ :: Creating Loop To Call In Entries From Text File Named Set

Jul 14, 2013

I am trying to create a loop to call in the entries from the text file named Set. The entries of Set.txtare :

1 2 3
2 4 5
and so on .. (64 such combinations)[/CODE]

It basically means the first combination for testing is 1 2 3 and next has to be 2 4 5 and so i have 64 such entries defined in set

My test files are located in D://data// and are named tst_data1 to tst_data64.

I created a loop for test set but its incorrect

Code:
// loop for test samples
char basefilename[] = "D://data//";
char , testFilen[160], numiChar[10];

for (int i=1; i<=64; i++) {
strcpy(basefilenme, "D://data//");
strcat(testfilename, Set[]);

[Code] .....

How can i call the Set .txt and how to define it.

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Visual C++ :: Writing To Named Pipe Coming From A Service (session 0) Without Admin Rights

Dec 9, 2014

I'm trying to write to a named pipe created by a service, as we all know the session 0 isolation implemented in vista and forward makes this task a bit complicated.

well at this point i managed to make almost all to work but my real problem comes when i try to write on the named pipe from my GUI application with no administrator rights

If i run the GUI application with admin rights it works 100% but, I don't need that application to require the user admin rights and for security reasons i rather to leave it without admin...

so i started my research and i found that there is a way to achieve this by calling CreateNamedPipe() with a low integrity security attributes...

well how to implement but i finally made it, the problem is that it gets worse than passing null security attributes, it works with admin rights with NULL security attributes, but when i pass the low integrity security attributes it gives "access denied" even when using admin rights, so i guess im passing the wrong security attributes but how to manually create the security descriptor string.

This is the code:

Service (session0) SERVER

Code:
DWORD WINAPI PipeThreadRSVS(void* pParameter){
LPTSTR _PIPE_NAME = "\.pipeRSVHPipeIn";
bool Break=false;
char Received_Buffer[BlockSize+16];
DWORD BytesRead = 0;

[Code] ....

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C :: RSA Implementation And N Modulus

Aug 18, 2013

I have to develop minimalistic implementation of RSA algorithm in C for an embedded device.

I'm doing that for two days but I have run into a problem. The N modulus is the limitation for the maximum message value to be encrypted with RSA.

For example theoretically RSA-1024 can encrypt/decrypt messages 1024 bits long but I still cannot understand how to choose p and q values to produce N == pow(2, 1024).

Is it possible to encrypt/decrypt 1024 bits long messages in practice if the N < pow(2, 1024)?

So far I'm getting the following results

Code:
Encrypting with RSA
d=15689981, e=21, n=16484947
In=16484942, Encrypted= 6074492, Out=16484942 (OK)
In=16484943, Encrypted= 5468920, Out=16484943 (OK)

[Code] ....

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C++ :: Big Integer Implementation?

Aug 8, 2013

I was trying to implement Big Integer Implementation. I wanted to start with the basic operation of addition. I am having some problems with operator overloading part

/**
BigInteger implementation
*/
#include "conio.h"
#include "iostream"

[Code]....

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C# :: RSS Reader MVC Implementation

Apr 19, 2014

I was looking at this tutorial: [URL] ..... And I was wondering if implementing it in MVC would be pretty much the same way? How would I display feed items in the views page using?

I tried something like:

ReaderModel Reader = new ReaderModel();
Collection<Rss.Item> List;
List = Reader.GetFeed();
ViewData["RssItems"] = List;

// then in index.cshtml
@foreach(Collection<Rss.Item> items in ViewData["RssItems"]) {
<h3>items.Title</h3>
...
}

I don't think this is right as I'm getting those red error lines...

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C++ :: Operator New Without Implementation?

Aug 5, 2013

Here is the code,

Code:
class A {
private:
void* operator new(size_t size);
};
int main() {
return 0;
}

The code above compiles fine without errors. But operator new might not have implementation body?

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C++ :: Gravity Simulator Implementation

Jul 9, 2013

I've been working on creating a simulator to crash two galaxies together as part of a project to stress test a CUDA super computer. I've got a long way to go and am currently just working on correctly simulating n-body gravity functions. First I will use this to simulate the cores of the galaxies (the black holes) and eventually the stars.

So long story short I'm working on the beginnings of a gravity simulator. At this point I found some basic code that works well but doesn't quite give the effect I'm looking for.

The code below only pulls each object towards each other like a spring faster and faster until they shoot off into infinity. I try to give one of my bodies an initial velocity to get it to orbit another, but it always just shoots straight at the other body. I'm thinking I need to factor in inertia so that the initial velocity doesn't just get calculated away really fast by the other calculations.

I'm really looking for a bit of direction to get a real gravity simulator with orbits and such working right so eventually I can scale it up to a galaxy, throw in 100B stars and let the CUDA run for a month..

Code:
void update_galaxies(GLdouble elapsedTime) {
//Calculate gravity simulations
GLdouble r1, r2, r3;
r1 = r2 = r3 = 0.0;

for(unsigned int i = 0; i < galaxies.size(); i++)

[Code] ....

As you can see, I'm calculating all the bodies in a vector called "galaxies" with each other, and doing a basic gravity calculation to it. The update_position function simply takes the calculated acceleration and uses it to calculate the velocity and position based on the "elapsedTime".

I think I need to use the Varlet or Runge-Kutta integration methods, after doing a bit more research.

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C :: Depth First Search Implementation

Mar 12, 2013

I'm having problems with implementing depth first search.

Code:
6 10 //6vertices 10edges
0 2 //vertex and its adjacent vertex
1 0
1 2
2 3
2 4
3 1
4 1
4 3
4 5
5 3

Output to terminal: 0 2 3 1 4 5
but it should be: 0 2 4 5 3 1

Here's my code:

#include<stdio.h>
#include<assert.h>
/* maxVertices represents maximum number of vertices that can be present in the graph. */
#define maxVertices 100
void Dfs(int graph[][maxVertices], int *size, int presentVertex,int *visited)

[Code] ....

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