c++ extract just numbers from an ostringstream

Question

If I have an ostringstream that contains various numbers separated by -

(That's: space - space btw)

Could I extract each number individually?

Simplest way: Whenever there is a `-` character expected, extract it into a dummy string object that is ignored. — Neil Kirk, Jan 22 '15 at 13:51
If you could submit that as an answer luk32, I'd gladly accept it — fakeaccount, Jan 22 '15 at 13:53

score 2 · Accepted Answer · edited May 23 '17 at 12:28

use one of spiting functions from here: Split a string in C++? storing them as strings inside std::vector, then use std::stoi (or equivalent) which parses string to integer , surrounding each call with try / catch.

example (after splitting):

for (int i = 0; i < arrayOfStrings.size(); i++)
{
    try
    {
        int myInt = std::stoi(arrayOfStrings[i]);
    }
    catch (std::exception& e)
    {
        std::cout<<e.what()<<"\n";
    }
}

score 0 · Answer 2 · answered Jan 22 '15 at 14:04

0

Something like this may work....

#include <boost/algorithm/string.hpp>
std::vector<int> ints;
boost::split(ints, " - ",std::stoi (stream.str()));

answered Jan 22 '15 at 14:04

Stefano

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1

That's assuming I'm using Boost – fakeaccount Jan 22 '15 at 14:05
picky... your question did not mentioned not using boost... :p – Stefano Jan 22 '15 at 14:10
3

I would have thought I needn't have specified everything I am not using, for that list would rather vast. – fakeaccount Jan 22 '15 at 14:14
@fakeaccount a simple "using only the standard library" would have covered it. – WhozCraig Jan 22 '15 at 14:16
3

Nevertheless, assumed knowledge is the worst kind of knowledge. – fakeaccount Jan 22 '15 at 14:19

c++ extract just numbers from an ostringstream

2 Answers2