Kefu Chai bab12e3a98 treewide: migrate from boost::adaptors::transformed to std::views::transform ...

now that we are allowed to use C++23. we now have the luxury of using
`std::views::transform`.

in this change, we:

- replace `boost::adaptors::transformed` with `std::views::transform`
- use `fmt::join()` when appropriate where `boost::algorithm::join()`
  is not applicable to a range view returned by `std::view::transform`.
- use `std::ranges::fold_left()` to accumulate the range returned by
  `std::view::transform`
- use `std::ranges::fold_left()` to get the maximum element in the
  range returned by `std::view::transform`
- use `std::ranges::min()` to get the minimal element in the range
  returned by `std::view::transform`
- use `std::ranges::equal()` to compare the range views returned
  by `std::view::transform`
- remove unused `#include <boost/range/adaptor/transformed.hpp>`
- use `std::ranges::subrange()` instead of `boost::make_iterator_range()`,
  to feed `std::views::transform()` a view range.

to reduce the dependency to boost for better maintainability, and
leverage standard library features for better long-term support.

this change is part of our ongoing effort to modernize our codebase
and reduce external dependencies where possible.

limitations:

there are still a couple places where we are still using
`boost::adaptors::transformed` due to the lack of a C++23 alternative
for `boost::join()` and `boost::adaptors::uniqued`.

Signed-off-by: Kefu Chai <kefu.chai@scylladb.com>

Closes scylladb/scylladb#21700

2024-12-03 09:41:32 +02:00

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