C++ :: Colon Usage (single And Double) Member Initializer List?
Aug 27, 2013
The below code is taken from the open source 7zip project (7z920CPP7zipUIFileManagerBrowseDialog.h)
Code:
class CBrowseDialog: public NWindows::NControl::CModalDialog {
What does the single colon (CBrowseDialog:) mean? Is that Initializer List?
I know the double colon (NWindows::NControl::CModalDialog) is Scope Resolution Operator.
Why is (: public NWindows::NControl::CModalDialog) used with the class declaration?
Similar code is found through out the project along with class declarations.
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Jan 22, 2014
Is there some way to generate an initializer list algoritmically?
In the case I'm thinking of, I want to initialize a map<> to pair<key, constant> over all expected values of key.
Obviously i could write a loop to initialize after construction, but it would be nice if it could be done in one statement.
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Feb 11, 2013
Provide the definitions for the following class declaration and then write a program that demonstrates usage of each member function using the test data of 10 for width and 8 for height. Remember to put your main program, class header and class source into separate files. This is an easier version of the exercise than the one you have been asked to practice. Only provide code for the methods specified in the class declaration. Note that the displayRectangle() method should output an appropriate ‘box’, its dimensions, area and perimeter to the screen.
class Rectangle {
public:
Rectangle(int height, int width);
~Rectangle(void);
[Code] .....
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Nov 26, 2014
#include <iostream>
#include <initializer_list>
using namespace std;
void doSomething(std::initializer_list<int> list) {
} int main() {
doSomething({2,3,6,8});
return 0;
}
I write a small piece of code like above. But I can not compile it successfully. I try it both with and without the line "using namespace std", but nothing worked.
The error list: Symbol 'initializer_list' could not be resolved
I use Eclipse CDT and GCC 4.9.1.
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Jan 4, 2015
In order to test catching exceptions from an initializer list, I deliberately did bad practice by hard coding an argument to a ctor that would cause a std::bad_allocto be thrown. Obviously better practice is to send a variable, but that would cause a compile error, so I hard coded a value.
The program I wrote creates Prime Numbers up to a specified limit which is an argument to the ctor of type std::size_t. The program works fine IMO, using g++ in cygwin:
$ time ./PrimesExe
Limit is 2000000
148933 Primes Created
real 0m1.210s
user 0m1.123s
sys 0m0.046s
Now when I send something invalid like a negative number or something too big for std::size_t, the program seems to run indefinitely, when compiled with g++ under cygwin. I haven't tested it yet on Linux.
However, if I do the same on VS2013 express, it takes about 15 seconds to print the expected caught exception message. I was not expecting it to take so ridiculously long compared to the reasonable amount of work involved in doing primes up to 2 million.
I have read up about what is involved in catching exceptions: stack unwinding, keeping track of what needs to be destroyed etc. But this is 1 object with 1 ctor argument, no Base classes or any other complications. So why such a long or indefinite amount of time?
This whole example is probably contrived, and I am wondering whether exceptions is the right tool for this - it is similar to the divide by zero problem, or could be considered a programming error to call a ctor with a bad argument?
Also, catching an exception thrown by an initalizer list seems a bit awkward in that one seems to have enclose the creation of the object and all subsequent uses of it (and any code in between ) in the same try block, otherwise it goes out scope. I suppose I could try to write a wrapper function that returns a smart pointer reference to a valid object, but I would have to test the validity of it's return too. That's the awkward part - there is probably a better way?
Are there any recommended ways of recovering from initializer list exception, that is, to allow the user to enter a new hopefully valid value and try to create the object again?
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Oct 21, 2013
I have a project that compiles fine with VS 2010. As I compile it with VS 2012 it generates the entitled error. Why?
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Aug 23, 2013
what is the process to delete everything from a singly linked list. Like S= 1->2->3->... I want to remove all the values from S and reuse it again to store new datas.
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Oct 10, 2013
My algorithm is not working
void remove_first() {
current_node = head_node;
node * temp_node = current_node;
current_node = current_node->get_next();
head_node->set_next(current_node);
delete temp_node;
temp_node = NULL;
}
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Jan 2, 2014
I'm having a small issue here with my linked list.I built a linked list with strings and it worked perfectly.Now since i'm using strtok() to separate the string.for now here's what i've got:
Code:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
typedef struct dict_word *word;
typedef struct node *Node;
typedef struct double_linked_list *DLL;
}
[code]....
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Oct 11, 2014
I'm trying to print a single linked list backward with functions/classes. I have created the main file and 3 header files. But I'm getting an error on one of the header files, linkedListIterator after adding #include "linkedListType.h". It says that "linkedLlistType.h" is calling itself. And when I try to run it, I get an error of "too many header files." I have tried changing the headers many times, but nothing seems to work.
.cpp file:
/*(Printing a single linked list backward) Include the functions reversePrint and recursiveReversePrint, as discussed in this chapter, in the class linkedListType. Also, write a program function to print a (single) linked list backward. (Use either the class unorderedLinkedList or the class orderedLinkedList to test your function.)*/
#include "linkedListType.h"
#include "orderedLinkedList.h"
#include "linkedListIterator.h"
#include <iostream>
using namespace std;
struct nodeType
[Code] ....
header files:
[URL] .... (error in this header file)
[URL] ....
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Dec 27, 2013
I'm trying to set up a simple implementation of a double linked list... But I seem to some mistakes.
#include <iostream>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
using namespace std;
#define ValueType int
struct vertex {
[Code] ....
I get 'Test: root exists' printed out, but not the loop through my linked list.
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Jul 26, 2013
I'm having trouble inserting a node in a nth position into a double linked list. My for loop is giving me an exception handler error and I can't link the node after the new node is inserted back to the new node. Here is my code,
void mylist::insertpos(const int &pos, const string &s, const int & c) {
listnode* temp1 = new listnode(s,c);
temp1->s =s;
temp1->next = NULL;
[Code]....
I attached my header file incase you need to see the definitions for my objects.
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May 12, 2014
So im trying to write a code that will take data in from a user and when that user enters specific character then i want to pop the top of the stack and place that node on a new stack. Then if the user enters a different specific character then i want to place what was just popped off the stack back on to the original stack. Anyways i'm just testing what i have without all the complicated stuff with the specific characters, but i get an error and i'm not not well versed in exception handling. So this is what i have so far. the push seems to work well but the pop seems to be giving me problems.
Stack::Stack(){
top = NULL;
bottom = NULL;
}
//method to push a line of text onto the stack
void Stack::push(string data)
[Code] .....
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Apr 2, 2013
I am developing a double linked list in C ( development environment ) is QT with mingw32 4.7 gcc / g++ compiler , in the header file I have defined struct as follows :
Code:
#ifndef LINKEDLIST_H
#define LINKEDLIST_H
#include <stdlib.h>
#include <sys/stat.h>
#include <signal.h>
#ifndef NULL
[Code] ....
When compiling I am getting the following error : 'NODE' undeclared (first use in this function)
and
each undeclared identifier is reported only once for each function it appears in
I have also attached the screen shot from the QT IDE
look's like the compiler is not able to pick up the definition of NODE structure , same happens in Netbeans IDE , interesting thing is if change the source file from c to cpp the error goes away .
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Nov 30, 2013
The code reads a text file delimited by colons : and formatted as follows
1111:2222:3333
How would I store the values separated by colons : into separate variables ?
Code:
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
int read_file();
[Code] ....
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Nov 9, 2013
I have a function reads from a file like this
file
foo;bar
foo;bar
foo;bar
function
void EntryList::loadfile(const char filefoo[]){
ifstreamin;
[Code] ....
I am in the middle of rewriting this program for at least the 4 time. and I have modified the file how I (humanly) think I should to this. I have had issues in the past, doing it this way. (still working on the other parts of the program so I cannot be too specific right now, but I know my results were unexpected ) So my question is does the function that I modified look correct for what I am trying to do? Am I off by one? I guess I am struggling with understanding how the original function is working. (step by step systematically.) hence my confusion about my modified function.
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Jun 11, 2014
I have to create a 2D link list with 2 level hierarchy
some thing like that
Code:
head nodes level 1: 0 1 2
/| / /|
Sub node level 2: 0 1 2 0 1 0 1 2
Real Data under |
each sub node: |
int **join=Null;
int unique = 0;
int col;
int ptr;
int *tmp_perm=Null;
int col_elem;
I know how to deal with 1 level link list structure. But i don't know how to access, delete, nodes and sub nodes from this 2 level hierarchy. C
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Aug 22, 2014
I am trying this without a head/start pointer which would generally hold the address of first node. I have 3 nodes here from which I am trying to delete last node, but its not happening. I might be wrong in my logic and this is my first linked list program.
#include <stdio.h>
#include <stdlib.h>
struct dll{
struct dll *prev;
int data;
struct dll *next;
[Code] ....
output::::
add of p1::0x9605008 add of p2::0x9605018 add of p3::0x9605028 add of p1->prev::(nil) add of p1->next::0x9605018 add of p2->prev::0x9605008 add of p2->next::0x9605028 add of p3->prev::0x9605018 add of p3->next::(nil)
no of nodes 3
enter the addresss of node to delete it
0x9605028
after deletion attempted
add of p1::0x9605028 add of p2::0x9605018 add of p3::0x9605028 add of p1->prev::0x9605018 add of p1->next::(nil) add of p2->prev::0x9605008 add of p2->next::0x9605028 add of p3->prev::0x9605018 add of p3->next::(nil)
no of nodes 3
In this example i am trying to delete the node 3 which is p3, by deleting its address 0x9605028. But after deletion the node count is still 3 and addresses are like unexpected!
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Dec 15, 2014
I'm trying to write a C program that will take a file that is delimited by colons and separate it out in to 5 sections:
0002:0003:0002:0080:<HTML>
0002:0004:0002:0080:<BODY>
I have the struct code in place but not sure how to actually store each of the 5 parts in memory. Here is the code below:
Code:
#include <stdio.h>
#include <stdlib.h>
#pragma warning(disable:4996)
struct contents
{
int source,destination,type,port;
char data[50];
};
[Code]....
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Mar 25, 2014
I am doing c++ program to read coordinates from text file into double linked list. Everything seems to work perfectly but it stores only 298 items in linked list. Im not sure if my code is wrong or I missed something. On the debugger length of list is over a 1000 but like I said it print outs only 298.
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Apr 23, 2015
I have a list with 2 items in it. When I double click on item 1, I want to open Window1.xaml, when I double click on item 2, I want to open Window2.xaml...
The code below works for popping up a message box, or window for that matter. But I really need to get the Window1 and Window2 based on the clicking of the correct selected item in the list.
Here is some code:
<ListView d:DataContext="{d:DesignData }" Name="PharmacyLv" IsSynchronizedWithCurrentItem="True" l:Sortbehavior.CanUserSortColumns="true" >
<ListView.ItemContainerStyle>
<Style TargetType="ListViewItem">
<EventSetter Event="MouseDoubleClick" Handler="ListViewItem_PharmDoubleClick" />
</Style>
</ListView.ItemContainerStyle>
[code].....
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Apr 28, 2015
I have to write a c program that will allow the user to enter names with ages. The name will be no longer than 40 characters. The name and age should be stored in a node of a doubly linked list. I cant use global data. I need to use 3 subroutines. the first one needs to enter the data and pass the head and tail pointers to the subroutine. the next subroutine needs to print the names and ages to the screen and file output.txt from first to last. the last subroutine needs to print out names and ages to the screen and file output.txt from the last to first.
Im getting several errors when i try to run this program. The first subroutine to get the data from the user and build the double linked list. but i seem to be having issues.
#include <stdio.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
int entry(char [][41], int []); // subroutine used for data entry //
void printit(char [][41], int [], int); // subroutine used for data printing //
void reverseprintit(char [][41], int [], int); // subroutine used for reverse data printing //
[Code] .....
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Jun 27, 2014
A while ago i was asked to write a program for a class that used a "Double ended queue with a current-position marker."
An example of some of the functions that i created are:
boolean atFirst() // Returns true if first element is current. Pre: !isEmpty().
boolean atLast() // Returns true if last element is current. Pre: !isEmpty().
void makeEmpty() // Sets this List to the empty state. Post: isEmpty().
void moveFirst() // Sets current marker to first element.
void movePrev() // Moves current marker one step toward first element.
void moveNext() // Moves current marker one step toward last element.
void insertBeforeFirst(int data) // Inserts new element before first element.
My question is whether a double ended queue with pointer is the same thing as a "doubly linked list" in this case. The terminology is throwing me of a little. If the two concepts are different, how is a doubly linked list different?
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Jun 15, 2013
Well, basically, what I've been doing was creating a class that would implement the concept of Double Linked List, but that would behave like a queue ( the STL implementation is deque, or Double Ended Queue ).
The problem occured when I have been trying to generalize the class using templates. I mean, why use only integers ? Why not double or char or what not ?
Worked perfectly before including all the template stuff..
// Source.cpp <=> Main.cpp
#include <iostream>
#include "DList.h"
using namespace std;
int main(void) {
DList<int> *list;
list = new DList<int>();
[Code] .....
The errors returned by the compiler:
Error1error C2955: 'Node' : use of class template requires template argument listc:usersjumperdesktopc++ otherdouble linked listdouble linked listdlist.h6
Error2error C2955: 'Node' : use of class template requires template argument listc:usersjumperdesktopc++ otherdouble linked listdouble linked listdlist.h6
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Jan 21, 2015
#include <iostream>
int ival1
int ival2=1
int summe
/* run this program using the console pauser or add your own getch, system("pause") or input loop */
int main() {
[Code] .....
If I compile it I've got these errors
[Error] expected initializer before 'int'
recipe for target 'rechnen.o' failed
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Nov 15, 2014
I'm working on a school project learning C++. I'm running into an error I can't seem to find the answer for (see topic title).
main.cpp
#include <iostream>
#include <string>
#include "Signature.h"
#include "Genome.h"
using namespace std;
// Calling Function
int main() {
Signature Sig1; // Create Signature object
Genome gString1; // Create Genome object
[code]....
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