Kefu Chai 4e9596a5a9 treewide: replace std::result_of_t with std::invoke_result_t ...

in theory, std::result_of_t should have been removed in C++20. and
std::invoke_result_t is available since C++17. thanks to libstdc++,
the tree is compiling. but we should not rely on this.

so, in this change, we replace all `std::result_of_t` with
`std::invoke_result_t`. actually, clang + libstdc++ is already warning
us like:

```
In file included from /home/runner/work/scylladb/scylladb/multishard_mutation_query.cc:9:
In file included from /home/runner/work/scylladb/scylladb/schema/schema_registry.hh:11:
In file included from /usr/bin/../lib/gcc/x86_64-linux-gnu/12/../../../../include/c++/12/unordered_map:38:
Warning: /usr/bin/../lib/gcc/x86_64-linux-gnu/12/../../../../include/c++/12/type_traits:2624:5: warning: 'result_of<void (noop_compacted_fragments_consumer::*(noop_compacted_fragments_consumer &))()>' is deprecated: use 'std::invoke_result' instead [-Wdeprecated-declarations]
 2624 |     using result_of_t = typename result_of<_Tp>::type;
      |     ^
/home/runner/work/scylladb/scylladb/mutation/mutation_compactor.hh:518:43: note: in instantiation of template type alias 'result_of_t' requested here
  518 |         if constexpr (std::is_same_v<std::result_of_t<decltype(&GCConsumer::consume_end_of_stream)(GCConsumer&)>, void>) {
      |
```

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

Closes scylladb/scylladb#18835

2024-05-26 16:45:42 +03:00

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