I've this sample program of a step that I want to implement on my application. I want to push_back the int elements on the string separately, into a vector. How can I?
#include <iostream> #include <sstream> #include <vector> using namespace std; int main(){ string line = "1 2 3 4 5"; //includes spaces stringstream lineStream(line); vector<int> numbers; // how do I push_back the numbers (separately) here? // in this example I know the size of my string but in my application I won't } This is a classic example of std::back_inserter.
copy(istream_iterator<int>(lineStream), istream_iterator<int>(), back_inserter(numbers)); You can create the vector right from the start on, if you wish
vector<int> numbers((istream_iterator<int>(lineStream)), istream_iterator<int>()); Remember to put parentheses around the first argument. The compiler thinks it's a function declaration otherwise. If you use the vector for just getting iterators for the numbers, you can use the istream iterators directly:
istream_iterator<int> begin(lineStream), end; while(begin != end) cout << *begin++ << " "; 
vector<int> numbers(istream_iterator<int>(lineStream), {});int num; while (lineStream >> num) numbers.push_back(num); 
string token; char del = " "; istringstream iss(line); while(getline(iss,token,del)) v1.push_back(stoi(token)); 