Nadav Har'El 674d3a5a84 compound_compat.hh: add missing methods of iterator ...

While debugging legacy_compound_view, I noticed that it cannot be used
as a C++20 std::ranges::input_range because it is missing some trivial
methods. So let's fix this, and make the life of future developers a
little bit easier.

The two trivial methods we need to implement:

1. A postfix increment operator. We already had a prefix increment
   operator, but the C++20 concept weakly_iterable also needs postfix.

2. By mistake (this will be corrected in https://wg21.link/P2325R3),
   weakly_iterable also required the default_initialized concept, so
   our iterator type also needs a default constructor.
   We'll never actually use this silly constructor, and when this C++20
   standard mistake is corrected, we can remove this constructor.

After this patch, a legacy_compound_view is accepted for the C++20
ranges::input_range concept.

Signed-off-by: Nadav Har'El <nyh@scylladb.com>

2022-03-08 15:37:03 +02:00

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