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++ :: 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++ :: Threads Giving Error - Call Of Object Of A Class Type Without Appropriate Operator Or Conversion

Jan 27, 2015

I made a simple binary tree then decide to try out threads too. I got the following error:

call of an object of a class type without appropriate operator or conversion

Code:
#include "Tree.h"
#include <iostream>
#include <thread>
void main(void){

[Code] ....

I am having a hard time figuring out why the error exists. I tried adding the new operator but that did not work.

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C++ :: How To Initialize Static Member Of Class With Template And Type Of Nested Class

Oct 7, 2014

How to initialize a static member of a class with template, which type is related to a nested class?

This code works (without nested class):

#include<iostream>
using namespace std;
struct B{
B(){cout<<"here"<<endl;}
};
template<typename Z>

[Code] ,....

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C++ :: Declare Template Type Object Inside Template Type Class Definition

Oct 12, 2013

Let me put it into the code snippet:

/**
This class build the singleton design pattern.
Here you have full control over construction and deconstruction of the object.
*/
template<class T>
class Singleton

[Code]....

I am getting error at the assertion points when i call to the class as follows:

osgOpenCL::Context *cxt = osgOpenCL::Singleton<osgOpenCL::Context>::getPtr();

I tried commenting assertion statements and then the debugger just exits at the point where getPtr() is called.

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C++ :: Templated Class Function Does Not Have Class Type

Feb 3, 2013

I'm trying to template the return type for this function (component), I've looked around for example code but there doesn't seem to be any exactly like what I want.

Entity.hpp
class Entity {
public:
Entity();
unsigned int id = 0;
Component& addComponent(std::string);

[Code] ....

Error : 'ent1.component<HealthComponent>' does not have class type

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C++ :: Passing Class As Type In Template Class

Nov 30, 2013

I am trying to pass a class as a type to a template class. This class's constructor needs an argument but I cannot find the correct syntax. Is it possible?

Here is an example of what I described above. I did not compiled it, it is for illustrative purpose only. And of course argument val of the myData constructor would be doing something more useful than simply initializing an int....

template <class T>
class templateClass {
templateClass() {};

[Code]....

My real code would only compile is I add the myData constructor:

myData () {};

and gdb confirmed that it is this constructor that get called, even with dummy(4).

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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++ ::  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++ :: 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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Visual C++ :: Reach Top Class Inherits From Goal Class - Linker Error

Dec 10, 2012

Linker error.

First off the error

Code:
Error1error LNK2019: unresolved external symbol "public: __thiscall ReachTop<class Character>::ReachTop<class Character>(class Character *)" (??0?$ReachTop@VCharacter@@@@QAE@PAVCharacter@@@Z) referenced in function "void __cdecl `dynamic initializer for 'gReachTop''(void)" (??__EgReachTop@@YAXXZ)Main.objDecisionTest

Reach Top class inherits from Goal Class

Goal Class

Code:
#ifndef _GOAL_H
#define _GOAL_H
#include "Action.h"
#include <list>
template <class T>
class Goal

[Code] ....

Code to create

Code:
Character* gCharacter = new Character(1, gWorld);
Goal<Character>* gReachTop = new ReachTop<Character>(gCharacter);

I can provide the character class and its inheritance aswell if you like.

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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 :: 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# :: 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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