storing input from text file into 2d array using vectors - c++

Question

So, I need to store the data from the text file into 2d array. I tried using vectors. So here is the sample data from the text file:
START 13
PID 11
CORE 120
SSD 0
CORE 60
SSD 0
CORE 20
SSD 0
I want to store this data as final_vec[x][y]. This is what I tried:
void read_file(const string &fname) {
ifstream in_file(fname);
string line;
vector<string> temp_vec;
vector<vector<string>> final_vec;
while ( getline (in_file,line) )
{
stringstream ss(line);
string value;
while(ss >> value)
{
temp_vec.push_back(value);
}
final_vec.push_back(temp_vec);
}
for (int i = 0; i < final_vec.size(); i++) {
for (int j = 0; j < final_vec[i].size(); j++)
cout << final_vec[i][j] << " ";
cout << endl;
}
}
int main()
{
read_file("test.txt");
return 0;
}
I get error:
main.cpp: In function ‘void read_file(const string&)’:
main.cpp:29:29: error: variable ‘std::stringstream ss’ has initializer but incomplete type
stringstream ss(line);
I am not sure if I am on the right track.

Answer 1

IMHO, a better solution is to model each line as a record, with a struct or class:
struct Record
{
std::string label;
int number;
friend std::istream& operator>>(std::istream& input, Record& r);
};
std::istream& operator>>(std::istream& input, Record& r)
{
input >> r.label;
input >> r.number;
return input;
}
The overloaded operator>> makes the input loop a lot simpler:
std::vector<Record> database;
Record r;
while (infile >> r)
{
database.push_back(r);
}
Rather than have a 2d vector of two different types, the above code uses a 1D vector of structures.