I tried to run my C++ program using g++ but am getting following exception:
"typeinfo for ocl::CRException" am using ocl namespace containing CRException class.. Please, help me on this.
Here is the code where am including OCL classes :
#ifndef VOIDSOFT_ADA2_LIND_HH
#define VOIDSOFT_ADA2_LIND_HH
#include <string>
#include <list>
#include <queue>
#include <map>
#include <ocl.h>
#include "threaded.hh"
using namespace std;
using namespace ocl;
class circuit;
class Lind: public Threaded
{
public:
typedef int lookup_t;
private:
OraConnection connection;
pthread_mutex_t *done_m;
queue<pthread_t> *q;
lookup_t type;
public:
circuit *c;
Lind();
~Lind();
void *run();
map<string, pair<string, string> > *getnodes(string);
bool connect();
void disconnect();
private:
circuit *getcircuitinfo(string, circuit *c = 0);
void bindInStr(OraQuery &q, string arg, string bindvar, map<string, string> *properties);
map<string, pair<string, string> > *node2name(string);
};
/* Lookup types */
namespace LindLookupTypes {
/* Get overlying */
const int OL = 0x001;
/* Get underlying */
const int UL = 0x002;
}
#endif /* VOIDSOFT_ADA2_LIND_HH */
It usually means you forgot to define (implement) a virtual method somewhere. Check that all virtual methods of ocl::CRException are defined and that the object file where they are defined is actually linked to your code.
If it doesn't help, edit the answer and show us the code for CRException.
Related
I'm trying to make something similar to std::Map. I have two classes, NameValue which takes a name and a Value. The class Value can hold data of type int and string. I want the Value class to also accept NameValue to be able to create nested objects. Currently the boost::variant is used to hold the data types allowed to be used.
NameValue.h
#ifndef INC_NAME_VALUE_H_
#define INC_NAME_VALUE_H_
#include <boost/variant.hpp>
#include <iostream>
#include <string>
#include "value.h"
namespace config {
using namespace std;
class Value; // forward declaration
class NameValue {
private:
string name;
Value* valuePtr;
public:
NameValue(){};
NameValue(string name, Value& value)
: name(name)
, valuePtr(&value){};
void Print() {
cout << name << " : ";
// valuePtr->Print();
}
void Set(Value* value) { valuePtr = value; }
};
}
#endif /* INC_NAME_VALUE_H_ */
Value.h
#ifndef INC_VALUE_H_
#define INC_VALUE_H_
#include <boost/variant.hpp>
#include <iostream>
#include <string>
#include "name_value.h"
namespace config {
using namespace std;
using variantDataType = boost::variant<int, string>;
class Value {
private:
variantDataType value;
public:
Value(){};
Value(variantDataType const& value)
: value(value){};
void Print() { cout << value << endl; }
};
}
#endif /* INC_VALUE_H_ */
In Value.h I want to add NameValue to variant like this:
boost::variant<int,string,NameValue> value;
main.cpp
Value i(42);
NameValue nv("meaning", i);
NameValue nv2("nested, NameValue("deep", "value"));//this is what I want
Maybe I'm on the wrong track using variant or the way I'm using dependencies. If there is some other way to make it work I would appreciate the suggestions.
First I would like to show the working code and then explain, how i want to change things. This is simple boost multi_index example:
//main.cpp
#include <boost/multi_index_container.hpp>
#include <boost/multi_index/ordered_index.hpp>
#include <boost/multi_index/identity.hpp>
#include <boost/multi_index/member.hpp>
#include <string>
struct employee
{
int id;
std::string name;
employee(int id, const std::string& name) :id(id), name(name){}
bool operator<(const employee& e)const{ return id<e.id; }
};
typedef boost::multi_index::multi_index_container<
employee,
boost::multi_index:: indexed_by<
// sort by employee::operator<
boost::multi_index:: ordered_unique< boost::multi_index:: identity<employee> >,
// sort by less<string> on name
boost::multi_index::ordered_non_unique<boost::multi_index::member<employee, std::string, &employee::name> >
>
> employee_set;
int main()
{
employee_set es;
es.insert(employee(0, "Bob"));
}
Imagine if main.cpp is another module, without boost dependency. I want to udnerstand how to:
include some header file with boost multiindex container class being forward declared into main.cpp
define multiindex container of employees in additional .cpp file
I have tried tons of variants, but none if this works. Is it possible to create something like this?
//notmain.cpp
#include <boost/multi_index_container.hpp>
#include <boost/multi_index/ordered_index.hpp>
#include <boost/multi_index/identity.hpp>
#include <boost/multi_index/member.hpp>
#include "notmain.h"
typedef boost::multi_index::multi_index_container<
employee,
boost::multi_index::indexed_by<
// sort by employee::operator<
boost::multi_index::ordered_unique< boost::multi_index::identity<employee> >,
// sort by less<string> on name
boost::multi_index::ordered_non_unique<boost::multi_index::member<employee, std::string, &employee::name> >
>
> employee_set;
Now comes h.file I need to fill with forward declaration (or explicit initiation) of container. I may be misunderstanding these terms, but I am new to c++ and boost.
//notmain.h
#include <string>
/*
Some how here I need forward declaration or explicit initiation of boost container
class employee_set ???
*/
struct employee
{
int id;
std::string name;
employee(int id, const std::string& name) :id(id), name(name){}
bool operator<(const employee& e)const{ return id<e.id; }
};
This is final goal. I want to remind that main.cpp is imagined to be .cpp of another module, without boost dependency.
//main.cpp
#include "notmain.h"
int main()
{
employee_set es;
es.insert(employee(0, "Bob"));
}
If the type is part of a class' visible interface then any headers that class is dependent on have to be included, no way around that. If you really don't want it to be part of the visible interface consider using the pImpl idiom:
Public header
#if !defined(MYCLASS_PUBLIC_H_)
#define MYCLASS_PUBLIC_H_
struct MyClassImpl;
class MyClass {
MyClassImpl * pImpl;
public:
void SomeOperation();
};
#endif
Implementation header:
#if !defined(MYCLASS_IMPL_H_)
#define MYCLASS_IMPL_H_
#include <private_type.h>
#include "MyClass.h"
struct MyClassImpl
{
void Operation();
private:
SomePrivateType member;
};
#endif
Implementation file:
#include "MyClassImpl.h"
void MyClass::SomeOperation()
{
pImpl->Operation();
}
void MyClassImpl::Operation()
{
// do something with 'member'
}
Code that only sees the public interface:
#include "MyClass.h"
void foo()
{
MyClass inst;
inst.SomeOperation();
}
I've got some classes like class below written in c++ and i have to implement them into the Windows Forms. Is there any solution to create unmanaged objects in Windows Forms /clr classes?
#pragma once
#ifndef _HOTEL_H
#define _HOTEL_H
#include "Room.h"
#include "Adress.h"
#include "Employee.h"
#include "Apartament.h"
#include "TechnicalRoom.h"
#include "RecreationRoom.h"
#include <vector>
#include <string>
using namespace std;
class Hotel {
protected:
int HotelID, HotelStars, NumberOfEmployee, NumberOfClients, NumberofRooms;
string HotelName;
Adress HotelAdress;
vector <Room*> Rooms;
vector <Person*> People;
public:
//methods
Hotel(int = 3, string = "Hotel");
~Hotel();
string getName();
int getNumberOfClients();
int getNumberOfEmployee();
int getHotelStars();
void changeNumberOfStars(int);
void BookApartament(int, int);
void AddRoom(int);
void DeleteRoom(int);
void AddEmployee();
void DeleteEmployee(int);
friend ostream & operator<< (ostream &out, Hotel &h);
friend ref class MainWindow;
};
#endif
It sounds like you might want something along the lines of:
namespace SomeCompany
{
public ref class Hotel
{
::Hotel* pHotel;
public:
Hotel() : pHotel(new ::Hotel()) {}
~Hotel() {
delete pHotel;
pHotel = nullptr;
}
!Hotel() {
delete pHotel;
}
// ... etc. ...
};
}
See How to: Wrap Native Class for Use by C# for many more details.
This question already has answers here:
Why can templates only be implemented in the header file?
(17 answers)
Closed 7 years ago.
I have a templated class named DataHandler
#ifndef DATAHANDLER_H
#define DATAHANDLER_H
#include <string>
#include <vector>
#include <iostream>
#include <fstream>
#include <set>
#include "constants.h"
template <typename T>
using Car = std::pair< T, T>;
template <typename T>
using SparseMatrix = std::vector< Car<T> >;
template <class T>
class DataHandler
{
public:
// initializes a new DataHandler only if none has been created,
// otherwise return the living instance
static DataHandler<T>* getInstance()
{
if(!dataHandler)
dataHandler = new DataHandler();
return dataHandler;
}
void readFile();
SparseMatrix<T>* getSparseBlue(){ return &sparseBlue; }
SparseMatrix<T>* getSparseRed(){ return &sparseRed; }
virtual ~DataHandler();
private:
// static DataHandler to ensure only one instance can be created
static DataHandler<T> *dataHandler;
// private constructor to use DataHandler as a Singleton
DataHandler();
int numElem = 0;
int m_rows, m_cols = -1;
#endif // DATAHANDLER_H
The source file is:
#include "data_handler.h"
#include <fstream>
#include <algorithm>
#include <omp.h>
#include <chrono>
using namespace std;
using namespace constants;
// Global static pointer used to ensure a single instance of the class.
template<typename T>
DataHandler<T>* DataHandler<T>::dataHandler = NULL;
template<typename T>
DataHandler<T>::DataHandler()
{
//ctor
}
template<typename T>
DataHandler<T>::~DataHandler()
{
//dtor
}
template<typename T>
void DataHandler<T>::readFile()
{
// do some stuff
}
// Instantiation of relevant templates
template class DataHandler<unsigned char>;
template class DataHandler<unsigned short int>;
In the last two lines I instantiate the templates which I define in main.cpp:
#include <iostream>
#include <chrono>
#include <fstream>
#include <algorithm>
#include "data_handler.h"
#include "dense_traffic_handler.h"
#include "sparse_traffic_handler.h"
#include "constants.h"
using namespace std;
// Check the number of rows/cols to choose between char or short int for the sparse case
bool matrixIsSmall()
{
return true;
}
void integerCase()
{
typedef unsigned char T;
DataHandler<T> *dh = DataHandler<T>::getInstance();
dh->readFile();
DenseTrafficHandler dth(dh); // ****** ERROR HERE *****
}
void charCase()
{
typedef unsigned char T;
DataHandler<T> *dh = DataHandler<T>::getInstance();
dh->readFile();
DenseTrafficHandler dth(dh); // ****** ERROR HERE *****
SparseTrafficHandler<T> sth;
set<unsigned short int> step = dh->getstep();
int currentStep = 0;
set<unsigned short int>::const_iterator stepToSave = step.begin();
}
int main(int argc, char *argv[])
{
if(matrixIsSmall())
charCase();
else
integerCase();
return 0;
}
Compiler gives me an error: undefined reference to DenseTrafficHandler::DenseTrafficHandler<unsigned short>(DataHandler<unsigned short>*)
DenseTrafficHandler header is like that:
#ifndef TRAFFICHANDLER_H
#define TRAFFICHANDLER_H
#include "constants.h"
#include "data_handler.h"
class DenseTrafficHandler
{
public:
template<typename T>
DenseTrafficHandler(DataHandler<T> *dh);
virtual ~DenseTrafficHandler();
private:
int m_cols, m_rows;
char* data;
char ** dense = NULL;
};
#endif // TRAFFICHANDLER_H
DenseTrafficHandler source is:
#include "dense_traffic_handler.h"
using namespace std;
using namespace constants;
template <typename T>
DenseTrafficHandler::DenseTrafficHandler(DataHandler<T> *datah)
{
DataHandler<T> *dh = datah;
dense = dh->getDense();
m_rows = dh->getm_rows();
m_cols = dh->getm_cols();
}
DenseTrafficHandler::~DenseTrafficHandler()
{
//dtor
}
So I have two questions:
Why do I receive this error and how can I manage it?
Is there a way in DataHandler source to not specify
template <typename T>
DataHandler<T>::functionName() for every function? (I mean something like using namespace Datahandler<T>)
You receive this error because compiler did not generate the code for this template type. One of solutions is to tell the compiler to do this explicitly by template instantiation:
add to your DenseTrafficHandler.cpp:
template class DenseTrafficHandler<unsigned short>;
Yes, just implement it in the header file. Reading more about it here.
error C2071: 'Lexicon::list' : illegal storage class
I have a class that reads a bunch of strings into memory and then provides functions that allow applying operations on those strings and their relationships. As part of this I'd like to have a shared memory between the main.cpp where some of the operations are initiated and the class where the operations are completed. For this, in a previous post, it was suggested to use an extern type. But, now there is an error. How do I resolve this error and have a memory space shared by several classes?
in lexicon.h
#ifndef _lexicon_h
#define _lexicon_h
#include <string>
#include <vector>
using namespace std;
class Lexicon {
public:
Lexicon();
~Lexicon();
extern vector<vector<string>> list;
void buildVectorFromFile(string filename, vector<vector<string>> &list, int v, int h);
private:
struct charT { char letter; nodeT *next;};
};
#endif
in main.cpp
#include <string>
#include <iostream>
#include <iomanip>
#include <fstream>
#include <vector>
#include "lexicon.h"
void buildVectorFromFileHelper (Lexicon & lex)
{
vector<vector<string>> list;
lex.buildVectorFromFile("ASCII.csv", list, 200, 2); //build 2x200 vector list
}
Ok, I missunderstood your previous question (this is what happens when you don't post full code). Inside a class, extern is not used:
in lexicon.h
#ifndef _lexicon_h
#define _lexicon_h
#include <string>
#include <vector>
using namespace std;
class Lexicon {
public:
Lexicon();
~Lexicon();
vector<vector<string>> list;
private:
struct charT { char letter; nodeT *next;};
};
#endif
in main.cpp
#include <string>
#include <iostream>
#include <iomanip>
#include <fstream>
#include <vector>
#include "lexicon.h"
void buildVectorFromFileHelper (Lexicon & lex)
{
vector<vector<string>> list;
lex.buildVectorFromFile("ASCII.csv", list, 200, 2); //build 2x200 vector list
}
The problem here is that Lexicon doesn't have the method buildVectorFromFile, so how are you calling lex.buildVectorFromFile("ASCII.csv", list, 200, 2);?
To share the same vector, if it's a member, make it static:
class Lexicon {
public:
Lexicon();
~Lexicon();
static vector<vector<string>> list;
private:
struct charT { char letter; nodeT *next;};
};
In lexicon.cpp:
vector<vector<string>> Lexicon::list;
The rules of an extern memory is explained here in this daniweb thread; the comment there is that yes, this should be simple but it is somehow not intuitive. The gist is that the memory is globally declared with the extern prefix in .cpp file A and then to reuse the memory in cpp B, globally declare it again in .cpp file B.
I think Luchian_Grigore and #jahhaj were getting there but we had either just not found the words for me to understand or they were still finding the words to explain.