Deleted function std basic_stringstream in linux with g++ - c++

Question

I've written the following in windows on Qt IDE and when I run it, it works well, however when I tried to run it on centOS with, I want to run code using threads, in which I'm just tring to load a CSV file and write the results within it in centos envirements
g++ -std=gnu++11 main.cpp -o main
I get the errors
does any solution to this issue ?
code
#include <iostream> // for standard I/O
#include <string> // for strings
#include <iomanip> // for controlling float print precision
#include <sstream> // string to number conversion
#include <ctime>
#include <future>
#include <fstream>
#include <string>
/*
*
* error This file requires compiler and library support for the ISO C++ 2011 standard.
* This support is currently experimental, and must be enabled with the -std=c++11 or -std=gnu++11 compiler options.
*
*/
using namespace std;
stringstream processing (int x,int id) {
std::cout << "Calculating. Please, wait...\n";
stringstream cvsStream;
for(int i = 0 ; i < x ; ++i){
cvsStream <<i<<","<<i<<","<<i<<","<<i<<"\n";
cout <<id<< " / "<<i<< endl;
}
return cvsStream;
}
int main(int argc, char *argv[])
{
string filename = "OutputFile.csv";
ofstream myfile;
stringstream cvsStream;
myfile.open(filename);
// If file does not exist, Create new file
if (!myfile )
{
cout << "Cannot open file, file does not exist. Creating new file..";
myfile.open(filename, fstream::in | fstream::out | fstream::trunc);
myfile <<"\n";
}
// open csv file
cvsStream <<" AD_ID "<<","<<"Starts at "<<","<<"At_Frame"<<","<<"Ends at "<<"\n";
myfile << cvsStream.str();
cvsStream.str("");
auto outputRslt1 = std::async (processing,1000,1);
auto outputRslt2 = std::async (processing,1000,2);
auto outputRslt3 = std::async (processing,1000,3);
stringstream rsltThread1 = outputRslt1.get();
stringstream rsltThread2 = outputRslt2.get();
stringstream rsltThread3 = outputRslt3.get();
// close csv file
myfile << rsltThread1.str();
myfile << rsltThread2.str();
myfile << rsltThread3.str();
myfile.close();
return 0;
}
errors
main.cpp: In function ‘std::stringstream processing(int, int)’:
main.cpp:22:8: error: use of deleted function ‘std::basic_stringstream<char>::basic_stringstream(const std::basic_stringstream<char>&)’
return cvsStream;
In file included from main.cpp:4:0:
/usr/include/c++/4.8.2/sstream:502:11: note: ‘std::basic_stringstream<char>::basic_stringstream(const std::basic_stringstream<char>&)’ is implicitly deleted because the default definition would be ill-formed:
class basic_stringstream : public basic_iostream<_CharT, _Traits>

Answer 1

In fact, Streams are not copyable, Unfortunately GCC 4.8 had not yet added the move constructor that was necessary for this to work. C++11 made them moveable and this is what makes it possible to return a local stringstream object from a function.
you can use function return the result as a string and consider as a solution or upgrade to a later version of GCC.
#include <iostream> // for standard I/O
#include <string> // for strings
#include <iomanip> // for controlling float print precision
#include <sstream> // string to number conversion
#include <ctime>
#include <future>
#include <fstream>
#include <string>
/*
*
* error This file requires compiler and library support for the ISO C++ 2011 standard.
* This support is currently experimental, and must be enabled with the -std=c++11 or -std=gnu++11 compiler options.
*
*/
using namespace std;
string processing (int x,int id) {
std::cout << "Calculating. Please, wait...\n";
stringstream cvsStream;
for(int i = 0 ; i < x ; ++i){
cvsStream <<i<<","<<i<<","<<i<<","<<i<<"\n";
cout <<id<< " / "<<i<< endl;
}
return cvsStream.str();
}
int main(int argc, char *argv[])
{
string filename = "OutputFile.csv";
ofstream myfile;
stringstream cvsStream;
myfile.open(filename);
// If file does not exist, Create new file
if (!myfile )
{
cout << "Cannot open file, file does not exist. Creating new file..";
myfile.open(filename, fstream::in | fstream::out | fstream::trunc);
myfile <<"\n";
}
// open csv file
cvsStream <<" AD_ID "<<","<<"Starts at "<<","<<"At_Frame"<<","<<"Ends at "<<"\n";
myfile << cvsStream.str();
cvsStream.str("");
auto outputRsl1 = std::async (processing,1000,1);
auto outputRsl2 = std::async (processing,1000,2);
auto outputRsl3 = std::async (processing,1000,3);
string rslThread1 = outputRsl1.get();
string rslThread2 = outputRsl2.get();
string rslThread3 = outputRsl3.get();
// close csv file
myfile << rslThread1;
myfile << rslThread2;
myfile << rslThread3;
myfile.close();
return 0;
}