gistfile1.txt

#include <sstream>
#include <string>
#include <vector>
#include <iostream>
#include <stdexcept>

/*  Symptoms : std::istringstream::operator>> fails on the second run, while parsing "2.0"
    Workaround: Recreate the istringstream object prior each call to operator>>, instead of resetting it with .str("")
    But what causes this?
*/

int main()
{
    using std::vector;
    using std::string;
    using std::istringstream;
    using std::cout;
    using std::endl;
    
    try
    {
        vector<string> strbuf;
        vector<float> fbuf;
        istringstream sstrm;
    
        strbuf.push_back(string("1.0"));
        strbuf.push_back(string("2.0"));
        strbuf.push_back(string("3.0"));
    
        float f;
    
        for(vector<string>::const_iterator it = strbuf.begin(); it != strbuf.end(); ++it)
        {
            string s = *it;
            sstrm.str(s);
            if(!(sstrm >> f)){
                std::runtime_error re(string("Conversion failure while parsing string \"") + s + string("\"."));
                throw re;
            }
            fbuf.push_back(f);
            sstrm.str("");
        }
        
        for(vector<float>::const_iterator it = fbuf.begin(); it != fbuf.end(); ++it)
        {
            cout << *it << " ";
        }
    }
    catch(std::bad_alloc& ba)
    {
        cout << "Out of memory." << endl;
    }
    catch(std::exception& e)
    {
        cout << "General exception: " << e.what() << endl;
    }
    catch(...)
    {
        cout << "Unknown exception." << endl;
    }
}