How to parse comma delimited integers from a string in c++

Question

I have a function recieving a string, which is a pair of comma delimited integers in a fashion such as \"12,4\". How can I parse the integers out of this string?

Answer 1

Depends whether or not you can depend on the incoming data being valid. If you can, I'd do:

#include <cstdlib>
#include <utility>
#include <string>

std::pair<int, int> split(std::string const& str)
{
    int const a = std::atoi(str.c_str());
    int const b = std::atoi(str.c_str() + str.find(',') + 1);
    return std::make_pair(a, b);
}

Answer 2

if you use Qt, you can use QString::split();

Answer 3

std::getline implements the basic "split" functionality (I don't see it mentioned in the first few answers at the other question.)

vector< int > numbers;

istringstream all_numbers_iss( "12,4" );
string number_str;
int number;

while ( getline( all_numbers_iss, number_str, ',' ) // separate at comma
        && istringstream( number_str ) >> number ) {
    numbers.push_back( number );
}

Answer 4

boost tokenizer works pretty well. Click here for example.