std::stringstream "str" returning nothing? - c++

Question

I'm having trouble with std::stringstream. My function as seen below returns absolutely nothing. Even when trying a stringstream outside of the template function it still returns nothing when .str() is called.
template < class T > std::string toString( const T &t )
{
std::stringstream temp;
temp << t;
std::cout << temp.str() << std::endl;
return temp.str();
}
std::string test = "test" + toString( 1 );
std::cout << test << std::endl;
std::stringstream stream;
stream << "test" << 1;
std::cout << stream.str() << std::endl;
Both of these output only "test"
Fixed
Had to remove _GLIBCXX_DEBUG and _GLIBCXX_DEBUG_PEDANTIC from my preprocessor macros.

Answer 1

Try ostringstream instead of stringstream.
== UPDATE ==
I compiled your code with GCC 4.6.1, and it works as-is:
#include <iostream>
#include <sstream>
using namespace std;
template < class T > std::string toString( const T &t )
{
std::stringstream temp;
temp << t;
std::cout << temp.str() << std::endl;
return temp.str();
}
int main()
{
std::string test = "test" + toString( 1 );
std::cout << test << std::endl;
std::stringstream stream;
stream << "test" << 1;
std::cout << stream.str() << std::endl;
return 0;
}
Output:
1
test1
test1

Answer 2

#include <iostream>
#include <sstream>
#include <string>
template < class T > std::string toString( const T &t )
{
std::stringstream temp;
temp << t;
std::cout << temp.str() << std::endl;
return temp.str();
}
int main(){
std::string test = "test" + toString( 1 );
std::cout << test << std::endl;
std::stringstream stream;
stream << "test" << 1;
std::cout << stream.str() << std::endl;
}
Outputs
1
test1
test1
For me with Clang 3.1, GCC 4.4.5 and MSVC 10, so your problem lies elsewhere. Please try just the code above in a new project and see if the problem persists. If not, the suggestions by #Industrial-antidepressant sounds quite realistic, i.e. that you have a better matching overload lying around somewhere.