Cant copy from a file to vector of pointers to objects - c++

Question

So I have a class called CStudentEmploy containing 3 variables.
I have another class class
CAnalizeData:CStudentEmploy
which contains a vector of pointers
vector<CStudentEmploy*>m_vData;
I also have istream operator :
friend istream& operator >> (istream& str,CStudentEmploy& obj)
{
str >> obj.m_strName >> obj.m_strFacNum >> obj.m_iMinutes;
return str;
}
I want to fill this vector from a file in a way like this:
CAnalizeData(const string &strFileName) {
ifstream ifile(strFileName.data());
copy(istream_iterator<CStudentEmploy*>(ifile), istream_iterator<CStudentEmploy*>(), back_inserter(m_vData));
}
This way works if I am trying to fill a vector of objects.
The error I get is :
Error C2679 binary '>>': no operator found which takes a right-hand operand of type '_Ty' (or there is no acceptable conversion)
I understand there is a problem with the iterator,but can't really fix it.Thanks.
Here is the full code:
#include <iostream>
#include <string>
#include <vector>
#include <iterator>
#include <fstream>
#include <algorithm>
#include <istream>
using namespace std;
class CStudentEmploy {
private:
string m_strName;
string m_strFacNum;
int m_iMinutes;
public:
CStudentEmploy() {
m_strName = "Empty";
m_strFacNum = "Empty";
m_iMinutes = 0;
}
CStudentEmploy(string strname,string strfacnum,int minutes) {
m_strName = strname;
m_strFacNum = strfacnum;
m_iMinutes = minutes;
}
CStudentEmploy(const CStudentEmploy &obj) {
m_strName = obj.m_strName;
m_strFacNum =obj.m_strFacNum;
m_iMinutes =obj.m_iMinutes;
}
int get_m_iMinutes() {
return m_iMinutes;
}
CStudentEmploy operator =(const CStudentEmploy &obj) {
this->m_strName = obj.m_strName;
this->m_strFacNum = obj.m_strFacNum;
this->m_iMinutes = obj.m_iMinutes;
return *this;
}
bool operator <(const CStudentEmploy &obj)const {
return m_iMinutes<obj.m_iMinutes;
}
CStudentEmploy operator +(const CStudentEmploy &obj) {
this->m_iMinutes += obj.m_iMinutes;
return *this;
}
friend ostream& operator << (ostream& str, const CStudentEmploy &obj)
{
str << "\nIme: " << obj.m_strName<< "\nF Nomer: " << obj.m_strFacNum << "\nMinuti:" << obj.m_iMinutes << endl;
return str;
}
friend istream& operator >> (istream& str,CStudentEmploy& obj)
{
str >> obj.m_strName >> obj.m_strFacNum >> obj.m_iMinutes;
return str;
}
};
class CAnalizeData:CStudentEmploy {
private:
vector<CStudentEmploy*>m_vData;
public:
CAnalizeData(const string &strFileName) {
ifstream ifile(strFileName.data());
copy(istream_iterator<CStudentEmploy*>(ifile), istream_iterator<CStudentEmploy*>(), back_inserter(m_vData));
}
void Write() {
vector<CStudentEmploy*>::iterator it = m_vData.begin();
while (it != m_vData.end())
{
cout << *it++;
}
}
void Sort() {
sort(m_vData.begin(), m_vData.end());
}
double calcMean() {
double avg = 0;
vector<CStudentEmploy*>::iterator it = m_vData.begin();
for (it = m_vData.begin(); it != m_vData.end(); it++) {
avg += (*it)->get_m_iMinutes();
}
cout << "Average minutes is:";
return avg / m_vData.size();
}
};
int main() {
CAnalizeData AB("Test.txt");
AB.Sort();
AB.Write();
cout << AB.calcMean();
cout << endl; system("pause");
return 0;
}

Answer 1

Perhaps something with std::transform:
CAnalizeData(const string &strFileName) {
ifstream ifile(strFileName.data());
transform(istream_iterator<CStudentEmploy>(ifile),
istream_iterator<CStudentEmploy>(), back_inserter(m_vData),
[](const CStudentEmploy &e) { return new CStudentEmploy(e); });
}
Using new there, since I assume the object would have been created on the stack.