Problem reading file and storing it in unordered_map - c++

Question

I'm trying to read a file and store it's content into an unordered_map but I've got a little problem. This is my unordered_map:
std::unordered_map<std::string, std::vector<double>> _users;
And this is the content of the file that I'm trying to read:
Mike 4 NA 8 NA NA
Lena NA 8 4 NA 9
I want to store the content in _users in a way that the key is the name, and inside the vectors we have the numbers associated to the name. Moreover I want NA to be equal to 0.
So I managed to do this:
while ( std::getline(file, line))
{
std::istringstream iss(line);
std::string key;
double value;
iss >> key;
dict[key] = std::vector<double>();
while (iss >> value)
{
dict[key].push_back(value);
}
}
But since value is a double, when checking NA it just stops the while loop and I just get, for example with Mike: Mike 4. How can I do in order to get it to read NA and put it as 0 inside the vector ? Thank you for your help!

Answer 1

For your inner loop, you could do:
std::string stringval;
while (iss >> stringval)
{
double value;
try
{
value = std::stod (stringval);
}
catch (...)
{
value = 0.0;
}
dict[key].push_back(value);
}

Answer 2

I also tried something:
#include <iostream>
#include <unordered_map>
#include <vector>
#include <string>
#include <fstream>
#include <sstream>
int main(int argc, char*[])
{
//1. Read the file and load the map
std::unordered_map<std::string, std::vector<double>> users{};
std::ifstream file{"file.txt"};
std::string line{};
while(std::getline(file, line))
{
std::istringstream iss(line);
std::string key{};
iss >> key;
std::vector<double> values{};
while(iss)
{
double value{0};
if (iss.str() != "NA")
iss >> value;
values.push_back(value);
}
users.insert({key, values});
}
//2. Printing the map
for(auto const &[key, values]: users)
{
std::cout << "Key: " << key << std::endl;
for(auto const value: values)
{
std::cout << value << " ";
}
std::cout << std::endl;
}
return EXIT_SUCCESS;
}