C++ ::  Getting Error With List Of Key Type

Oct 26, 2014

I have a Polymorphic class and some child classes, of which I need to make multiple instances of, using a list container. I've set the key type to be a unique pointer of the polymorphic class, and the values of each element pointing to a New Child instance, like so:

std::list<std::unique_ptr<Polymorphic>> polymorphic;
polymorphic.push_back(new Child(foo, bar));

The only problem is that when I try to push_back a new element, I get a compiler error, saying "No instance of overloaded function".Should I try and create a pointer object on it's own and push back that object as an element, it will work fine:

std::unique_ptr<Polymorphic> polym(new Child(foo, bar));
std::list<std::unique_ptr<Polymorphic>> polymorphic;
polymorphic.push_back(polym);

Is there some way I can push a new Child instead of having to create a Polymorphic pointer object and pushing that?

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C :: Type Of Error In MCQ

Jun 13, 2013

Q. Consider the following C declaration.
int x[10], y,z;

What kind of error does following statement contain?
z == x +y;

a. Syntax error
b. Semantic error
c. logical error
d. All of the above

According to me it should be option a, but I am confused, how to get confirm answer with explanation.

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C++ :: Error Class Does Not Name A Type

Nov 19, 2014

I am getting the error on the implementation of my class name. The error is coming from my parkingControl.cpp 'ParkingControl parkingControlMenu;'. I have used this implementation fine before, but once I added a new main it stopped working. Below is my code.

parkingControl.h
#ifndef PARKINGCONTROL_H_INCLUDED
#define PARKINGCONTROL_H_INCLUDED
#include <iostream>

[Code]....

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C/C++ :: Class Does Not Name A Type Error

Apr 6, 2015

I have two classes declared as below

#include<iostream>
using namespace std;
Class Node
{

[Code].....

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C++ :: Parser Does Not Name A Type Error

Oct 22, 2014

I am trying to write a program that reads in an XML file, parses it and prints out information about each tag. I am getting the following errors when trying to build the program:

Parser.cpp:24:1: error: 'Parser' does not name a type
Parser::getXMLData() {
^
Parser.cpp:120:1: error: 'Parser' does not name a type
Parser:rocessXMLData(

[Code] ....

Here is my code for the 5 files.

[ATTACH]main.cpp
[/ATTACH][ATTACH]Parser.h
[/ATTACH][ATTACH]Parser.cpp
[/ATTACH][ATTACH]Element.h
[/ATTACH][ATTACH]Element.cpp[/ATTACH]

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C++ :: G++ 4.7.2 Error - Mutex In Namespace STD Does Not Name A Type

Mar 11, 2013

I've verified this on ubuntu 12.10 and on windows/mingw, and found that g++ version 4.7.2 seems to have broken thread/mutex support.

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C++ :: Getting Error - Incomplete Type Is Not Allowed

May 26, 2014

When declare and assign an instance of a user-defined struct in a function. And the struct (theStruct) is not declared in the same header file as the function (theFunction). Like this:

files:
"A.h": declares the struct in a class (theClass)
"A.cpp": implements the struct
"B.h": declares the function
"B.cpp": implements the function, error here

I think making the instance (inst) a reference might solve this. But the instance is assigned to a return value from a function (returnFunc). Like:

void theFunction() {
...
theClass::theStruct inst = returnFunc(...);
//returnFunc() returns an instance of theStruct
//the error is at 'inst'
...
}

What do you think?

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C/C++ :: Error - Cannot Convert To A Pointer Type

Apr 3, 2015

I have attached the source code I am writing. I have been getting the two following errors. I know it's something to do with the pointer casting.

udp-server.c:174:3: error: subscripted value is neither array nor pointer nor vector
udp-server.c:165:3: error: cannot convert to a pointer type

The file is attached here.
udp-server-edit.txt (7.64K)
Number of downloads: 19

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C++ :: Error / Expression Must Have A Class Type

Apr 15, 2015

I'm trying to learn recursion, and I'm using a simple array to experiment with it, but I have a couple of annoying errors that I don't understand why they're there. Here's the code:

Code:
#include <cstdlib>
#include <iostream>
using namespace std;
int largest(const int arr[], int lowerIndex, int upperIndex) {
int max;

[code]....

Now try to print the array backwards:

//Use a recursive algorithm to find the largest element in arr:
int largest(arr[], lowerIndex, upperIndex);//error: expected an expression
return 0;
}

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C++ :: List Class With Student Type?

Jul 3, 2013

I am trying to use a class Student and declare it as a list type. I can pushback but without changing the List.h or Node.h how can I print the data in list2?

Node.h
#ifndef NODE_H
#defineNODE_H
#include <string>

[Code].....

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C :: Error To Define Data Type File?

Mar 21, 2013

I program unix sokcet programming , and part of my code is ti open file from server and open it , but i surprised with this wierd error i dont have any reason for it ?

Code:
#include <errno.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>

[Code] ....

File name is : myHeader.h
myHeader.h:24:1: error: unknown type name "File"???

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C :: Error - Dereferencing Pointer To Incomplete Type

Feb 21, 2015

I've been writing the math functions for a 3d game and tried compiling it at about 30 functions in. I get this error related to my pointers to my structures. it affects almost everything in all my functions (as youll see by looking at how i do the math in the function below). The compiler gives me the error

"error: dereferencing pointer to incomplete type"

on all my struct Type4D pointers but referencing the values in my struct TypeMatrix4X4 using pointers seems to work fine i think (it doesn't seem to complian explicitly about it. so here is the important code...

one example function

Code:
struct Type4D *MatVecMult4X4RtoL(struct TypeMatrix4X4 *mat, struct Type4D *vec) {
struct Type4D *dest = (struct Type4D *) malloc(sizeof(struct Type4D));

[Code]....

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C++ :: Adding Int Type Into Vector - Runtime Error

Feb 1, 2013

I am adding int type into vector called "vi" several times like this.

std::vector<int> vi;
void addFunc(int *a, int cnt) {
vi.erase(vi.begin(), vi.end());
vi.clear();
for(int i=0; i<cnt; i++)
vi.push_back(a[i]);
}

and I call the addfunc N times every sec.

And sometimes it has runtime error on vi.push_back line.

(called stack says "_CrtIsValidHeapPointer")

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C++ :: Error Dereferencing Pointer To Incomplete Type

Jul 10, 2013

I am having trouble with this program I get the error dereferencing pointer to incomplete type in the populate function I am using BloodShed's Dev C++ compiler v4.9.9.2 I copied this program out of a book because I was having a problem with a linked list in a similar program. I think there is a problem with the compiler not supporting these types of pointer's in a function.

#include <stdio.h>
struct tel_typ {
char name[25];
char phone_no[15];
struct tel_typ *nextaddr;

[code].....

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C/C++ :: Unknown Type Error For Bool Keyword

Jun 24, 2014

Is the bool keyword in C exactly like the boolean keyword in Java? why this code is getting an 'unknown type error' when I initiialze looping.

#include <stdio.h>
#include <stdlib.h>
int main()

[Code].....

If I am completely using the boolean concept wrong in C, should I just use break statements instead?

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C/C++ :: Error / Dereferencing Pointer To Incomplete Type

Sep 13, 2014

I am getting this error:

drivers/media/video/mxc/capture/gt2005.c:2256:62: error: dereferencing pointer to incomplete type

I am at a loss trying to figure this out. Here it is:

case Sensor_Flash:
{
struct i2c_client *client = to_i2c_client(to_soc_camera_control(icd));
struct sensor *sensor = to_sensor(client);
if (sensor->sensor_io_request && sensor->sensor_io_request->sensor_ioctrl) {
sensor->sensor_io_request->sensor_ioctrl(icd->pdev,Cam_Flash, on);
if(on){

Lines 6 and 7 are giving me the same error. What am I doing wrong?

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C/C++ :: Error - Initialization From Incompatible Pointer Type

Apr 8, 2012

Below is my code snippet.I'm getting "Error:initialization from incompatible pointer type" error on line 'int *q = status;'.

Obviously, I'm missing something but has no clue...:(

void findwalls(int *p,int y,int x){
int status[y_count][x_count][4];
int *q = status;
for(int i = 0;i < (y_count * x_count * 4);i++)
*(q + i) = *(p + i);

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C# :: Convert Anonymous Type List Into Bindinglist?

Sep 26, 2014

So I query out data from multiple tables and I put it as anonymous type. But since I need to get the remove function going, my datagridview has to get datasource from a bindinglist, not just a list. What could I do from this situation? I already checked: [URL] but intellisense doesn't pick up the .ToBindingList() function for my query.

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C# :: Creating List Of Lists With Different Type In Each Sublist

Jan 23, 2015

Im trying to do something like this:

private List<Calm> calm = null;
private List<Horror> horror = null;
private List<Battle> battle = null;

[Code].....

I want with lists[0][0].Name to get the Name variable from the first item of the list calm, but this doesnt working, is there any other way to do it?

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C :: Comparison Is Always False Due To Limited Data Type Error

Feb 16, 2013

Code:

do {
printf("Edit the entry's cellphone number:");
scanf("%s", addressbook[4][num]);
length = strlen(addressbook[4][num]); //gets the length of the input (should be 10)
//checks if the input is composed of 11 elements wherein the first 2 are 0 and 9 respectively
for(i=0; i<11; i++){

[Code] ....

why do I get an error here?

Code:
if ((addressbook[4][num][0] == '0') && (addressbook[4][num][1] == '9') || (addressbook[4][num][i]>='0') && (addressbook[4][num][i]<='9') && (length=='11'))

And how do I fix this?

The error message is: comparison is always false due to limited data type

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C/C++ :: Error - Insufficient Contextual Information To Determine Type

Aug 16, 2013

I have part of a class that checks to make sure there is a fault that lasts for 60 seconds. The code below is written several times throughout the class for different subsystems dealing with overcurrent.

// Over Current
if (UUV->getCTaps(MOTORCURRPOS_1) > 1.4*UUV->getcurrMode.getMotor().Peak) // The fault { 
if (motor1Timer == NULL)
motor1Timer = time(&timer);
else if ( time(&timer) - motor1Timer >= 60)
motor1Over = true;
} else
motor1Timer = NULL;

The timing statement is okay because it works on all of the other fault checkers. It is the if statement that is causing the error I just do not know why.

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C++ :: Error - Invalid Initialization Of Non-const Reference Of Type

Feb 11, 2013

I am trying to use the Singleton design patterno on Linux, but it is not working:

in the .h I have:

Code:
public:
static ErrorH& Instance();
private:
ErrorH() {};

In the .cpp I have:

Code:
ErrorH& ErrorH::Instance() {
static ErrorH& self = ErrorH();
return self;
}

The errors I get are:

Code:
g++ --g -c ErrorH.cpp -o ErrorH.o
ErrorH.cpp: In static member function "static ErrorH& ErrorH::Instance()":
ErrorH.cpp:9: error: invalid initialization of non-const reference of type "ErrorH&" from a temporary of type "ErrorH"
make: *** [ErrorH.o] Error 1

This code works on Windows, how can I get it to work on Linux?

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C++ :: Can Use Templates To Make A Multi-type Linked List?

Apr 28, 2014

If I wanted an int connected to a float connected to a string connected to a POD, would all I have to do is :

Code:

template<class T, class X>
struct node {
T data;
node<X> *next;
};

Or would I be forced into using polymorphism?

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C :: Change / Fill List Without Changing Function Type

Feb 13, 2013

I am an IT student currently learning linked list. I have a problem with my code here. After I call addFront() my list doesn't change when I display it. How do I somewhat change/fill my list without changing the function type? I know it works on pointers still messed up with linked list.

Code:

typedef struct node *nodeptr;
struct node{int item;
nodeptr next;};
typedef nodeptr List;
}

[code]....

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C# :: SQLException - Error Converting Data Type Varchar To Numeric

Oct 22, 2014

I am writing a simple program to suck in a txt file then pump it into sql.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Data.OleDb;
using System.Data.SqlClient;

[Code] ......

How I can get past this error and get the data into sql? I read a couple articles on .tag but not sure I understand what to do.

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C++ :: Generic Linked List Compilation Errors / Incompatible Pointer Type

May 19, 2014

I am trying to write a generic linked list in c, but for some reason i keep getting errors saying "incompatible pointer type. This is the code and erros:

#ifndef SLIST_H
#define SLIST_H
#include <stdlib.h>
typedef struct {
void *data;
slist_elem *next;

[code]....

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