istringstream

[Jennifer84]

I am using istringstream to put strings separated by commas to own std::strings.
I have done this wich works:

std::string One, Two, Three, Four, Five, Six;
std::string Value = "a,b,c,d,e,f";
istringstream is(Value);

while ( getline(is, One, ',') && getline(is, Two, ',') && getline(is, Three, ',') && getline(is, Four, ',') && getline(is, Five, ',') && is >> Six)
   {
	//Action;
   }

So I am extracting Value that consists of 6 strings separated by ",".
Now if I will take "f" away from Value. This will not work. The std::strings One to Five will not be assigned any strings as it is only 5 elements in the string Value now.
Why does this happening ?
Is this possible to make it work when you dont know how many strings you are trying to exctract from Value. The maximum will be 6 though.

[Lerner]

Not if the substrings need to go into a rigid set of variables. You could declare an array/vector that could hold up to 6 strings and extract them out of the original string one at a time storing them in the array as you go. In the array they won't be assigned to string variables by the name of One, Two, etc, however.

[Jennifer84]

Okay, that sounds nice. I know exactly how vectors works and how to assign the elements but what I dont really know how to do, is to exctract each string separated by ',' in my std::string Value.
I know how to do if I know how many strings that are separated but not if I dont know how many strings that is separated by ','
Any idéas how to do that ?
Thanks...

std::vector<string> Store(5);
std::string Value = "a,b,c,d,e,f"; //Strings can differ. This example is 6, 
                                   //sometimes it can be 5,4,3,2 or 1

Not if the substrings need to go into a rigid set of variables. You could declare an array/vector that could hold up to 6 strings and extract them out of the original string one at a time storing them in the array as you go. In the array they won't be assigned to string variables by the name of One, Two, etc, however.

[mitrmkar]

This is practially pretty much what Lerner said ...

std::string Value = "a,b,c,d,e,f";
istringstream is(Value);
std::string s;
std::vector<string> v;

while (getline(is, s, ','))
{
    // add item
    v.push_back(s);
}
// iterate through the vector and output each item ...
for(std::vector<string>::iterator it = v.begin(); it != v.end(); it ++)
{
    cout << *it << endl;
}

[Jennifer84]

Thank you very much mitrmkar and Lerner. That did solve it. I was not really sure how to continuosly get the next string after each ',' but now I know how to do that.
Thanks... :)

This is practially pretty much what Lerner said ...

std::string Value = "a,b,c,d,e,f";
istringstream is(Value);
std::string s;
std::vector<string> v;

while (getline(is, s, ','))
{
    // add item
    v.push_back(s);
}
// iterate through the vector and output each item ...
for(std::vector<string>::iterator it = v.begin(); it != v.end(); it ++)
{
    cout << *it << endl;
}