Overload handling of std::endl?

Question

I want to define a class MyStream so that:

MyStream myStream;
myStream << 1 << 2 << 3 << std::endl << 5 << 6         


        

Answer 1

Your overloaded operators of the MyStream class have to set a previous-printed-token-was-endl flag.

Then, if the next object is printed, the [blah] can be inserted in front of it.

std::endl is a function taking and returning a reference to std::ostream. To detect it was shifted into your stream, you have to overload the operator<< between your type and such a function:

MyStream& operator<<( std::ostream&(*f)(std::ostream&) )
{
    std::cout << f;

    if( f == std::endl )
    {
        _lastTokenWasEndl = true;
    }

    return *this;
}