尝试调用将向矢量添加数据的函数时出错

Question

I get an error that I believe is caused by the function I wrote to store data from a file in a vector in my class called store in store.cpp.

Main.cpp

#include <iostream>
#include <sstream>
#include <fstream>
#include <vector>
#include <string>
#include "store.h"

using namespace std;

int main ()
{
    store data;
    ifstream inFile ("C:/Users/Owner/Desktop/Albums.csv");
    string line;
    string item;
    int num;
    int itemnum;
    int linenum = 0;
    while (getline (inFile, line))
    {
        linenum++;
        cout << endl << "Line #" << linenum << ":" << endl;
        istringstream linestream(line);
        itemnum = 0;
        num = 0;
        while (getline (linestream, item, ','))
        {
            itemnum++;
            if (itemnum == 2 || itemnum == 3 || itemnum == 4 || itemnum == 6)
            {
                num++;
                data.addtovect(linenum, num, item);
            }
            cout << "Item #" << itemnum << ": " << item << endl;
        }
    }
    return 0;
}

Store.h

#ifndef STORE_H
#define STORE_H

#include <iostream>
#include <sstream>
#include <fstream>
#include <vector>
#include <string>
using namespace std;

class store
{
    public:
        store();
        void addtovect(int, int, string);
        void print();

    private:

        vector< vector<string> > fullline();
};

#endif

Store.cpp

#include "store.h"

store::store()
{

}
void store::addtovect(int a, int b, string c)
{
    fullline[a][b].push_back(c);
}
void store::print()
{

}

The error is:

C:\\Users\\Owner\\Desktop\\C++ projects\\csc125\\lab4\\store.cpp|9|error: invalid types '<unresolved overloaded function type>[int]' for array subscript|.

I tried looking for a way to fix it, but I didn't really come any closer to figuring it out. Some of the things I saw said that the error was caused by the vector being confused with a function, but I have no idea how I could fix it.

Answer 1

In your header file you define fullline as a function that returns a vector containing vectors containing strings:

vector< vector<string> > fullline();

Remove the parentheses and it will instead be a vector containing vectors containing strings.

vector< vector<string> > fullline;

Edit:
When you try to add the string to your fullline vectors, you will have some issues:
1) The inner vector is not created, you will at some point have to push_back a vector into the first vector.
2) You are trying to push your string into a string:

fullline[a][b].push_back(c);

fullline < This is your first vector.
fullline[a] < Here you get the secondary vector.
fullline[a][b] < Here you get the object within the second vector (a string).
fullline[a][b].push_back(c) < Here you try to push back c into the string.

Answer 2

Your variable is

     vector< vector<string> > fullline

fullline is a vector, fullline[a] is a vector, but fullline[a][b] is a string.

string is basically vector<char>, so it also has the push_back method, but you can only push_back a char to string.