C++ cout with prefix

Question

I want a ostream with a prefix at the beginning of every line redirected on cout; I try this:

#include 
#include 
class paralle         


        

Answer 1

Your output operator is returning a reference to the base class (std::ostream), which means that the next call to operator << will not use your implementation.

Changing your output operator to this should fix your problem:

template 
parallel_cout& operator<< (const T& val)
{
    out << "prefix " << val;
    return *this;
}