- A macro with the very generic name `BYTE_TYPE` is likely to collide with existing code, so get rid of the macro.
- The new solution is to provide a non-deprecated `byte` in the namespace `gsl::impl`.
- Users of GSL should use `gsl::byte`, which is still deprecated when mapped to a `std::std::byte`.
- GSL types and functions need to use `gsl::impl::byte` so they do not trigger the deprecation warning.
- The `gsl::impl::byte` return type in an exported function is not nice, it might mislead users to use that type in their own declarations. But the `BYTE_TYPE` solution is not better in this respect.
Co-authored-by: Werner Henze <w.henze@avm.de>
* deprecated features adopted into C++
1) Mark the following GSL features as deprecated:
- gsl::unique_ptr (always)
- gsl::shared_ptr (always)
- gsl::byte (since c++17)
- gsl::joining_thread (never implemented)
2) Refactor existing deprecations to use the new GSL_DEPRECATED(msg) macro.
3) Create a section in the README for deprecated features in the
standard.
* do not deprecate gsl::to_integer because we never claim to implement it.
* do not use gsl::byte if it is deprecated
