Question

I am having problem in declaring StringStream in QT.
Here is my code:

 std::stringstream ss;
                 for (int i = 0; i <= path.length()-1; ++i)
                 {
                    if (path[i] == '\\')
                    {
                        ss << "\\\\";
                    }
                    else
                    {
                    ss << path[i];
                    }
                 }
                    path = QString::fromStdString(ss.str());//store the stringstream to a string
         return path;

the error message is:

aggregate 'std::stringstream ss' has incomplete type and cannot be defined;

Answer 1

Mixing QString and std::string or related is not generally a good idea. You should implement that with QString methods like replace( QChar ch, const QString & after, Qt::CaseSensitivity cs = Qt::CaseSensitive).

path.replace('\\', "\\\\");

BTW, you can’t use QString directly with any of the standard std streams, there are no overloads defined. The qPrintable function can help though. And you need to include <sstream> to use std::stringstream.