Writing an ostream filter?
c++, iostream
Solution
`std::ostream` is not the best place to implement filtering. It doesn't have the appropriate virtual functions to let you do this.
You probably want to write a class derived from `std::streambuf` containing a wrapped `std::ostream` (or a wrapped `std::streambuf`) and then create a `std::ostream` using this `std::streambuf`.
`std::streambuf` has a virtual function `overflow` which you can override and use to alter the bytes before passing them to the wrapped output class.
Problem
I'd like to write a simple `ostream` which wraps an argument `ostream` and changes the stream in some way before passing it on to the argument stream. The transformation is something simple like changing a letter or erasing a word What would a simple class inheriting from `ostream` look like? What methods should I override?