Kpp Ostream Backends HowTo

---- Ostream Backends HowTo << Output Ostream Backends << Output << Kpp c++ ----

How to design a backend ostream for kpp::print :

Required:

The backend ostream should be a class.
The class should define virtual destructor.
The class has an "using alias" to the buffer-type,
its name should be buffer_type (For example: using buffer_type = std::ostream),
and it should be public.
- (
  - The backend-ostream is named ostream_type in kpp,
  - the buffer_type is the actual ostream-type,
  - but it is not named ostream_type in kpp.
  - For example, std::ostream can be used as the buffer_type,
  - but std::ostream is not named ostream_type of kpp
- )
It does not require the __buffer created by the buffer_type is Lvalue-reference or not.
.operator<< should be a method of the class as the ostream-operator,
global free function operator<< will be never called.
Method operator<< should return a "self-type &"
The class should not have any constexpr.

Not required, but helpful:

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