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refactor: remove C++17 workarounds #6380

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refactor: remove C++17 workarounds #6380

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@kwvg kwvg commented Nov 2, 2024 •
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Additional Information

  • Depends on depends: update 'src/immer' to arximboldi/immer@5875f773 as c0b716f2 #6377

  • Using an existing namespace as an alias for a namespace part of the std namespace (as done in ranges) has been done before, see namespace fs, an alias to std::filesystem (here).

  • While the comment in wallet.cpp did mention that there would be a better way to do the cast than in C++17, the method to do so, using std::chrono::clock_cast, has still not been implemented in Clang (source). The issue has been sidestepped by not using std::time_t at all and instead relying on fs::file_time_type, the type returned by fs::last_write_time.

Breaking changes

None expected.

Checklist

  • I have performed a self-review of my own code
  • I have commented my code, particularly in hard-to-understand areas (note: N/A)
  • I have added or updated relevant unit/integration/functional/e2e tests (note: N/A)
  • I have made corresponding changes to the documentation (note: N/A)
  • I have assigned this pull request to a milestone (for repository code-owners and collaborators only)

kwvg added 4 commits November 1, 2024 11:42
@kwvg
refactor: remove rfind workaround with starts_with
d8e0425
@kwvg
refactor: use constexpr std::{copy, fill} in V2ShortIDs
acda80e
@kwvg
refactor: avoid convoluted casting by not using std::time_t
4717fe8 
std::clock_cast is a part of C++20, hence the original TODO comment but
it's still not implemented in Clang, as of this writing. We can sidestep
the cast by not using time_t to begin with.
@kwvg
refactor: make namespace ranges mostly an alias of std::ranges
0577b4d
@kwvg kwvg added this to the 23 milestone Nov 2, 2024
@kwvg kwvg mentioned this pull request Nov 2, 2024
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PastaPastaPasta added a commit that referenced this pull request Nov 4, 2024
@PastaPastaPasta
Merge #6377: depends: update 'src/immer' to arximboldi/immer@5875f773 …
a8e2316 
…as c0b716f2

f18e839 build: drop symlinks in immer subtree (Kittywhiskers Van Gogh)
d761111 build: fix gitian builds (Kittywhiskers Van Gogh)
a9f46b3 Squashed 'src/immer/' changes from 9cb6a5a845..5875f7739a (Kittywhiskers Van Gogh)
e4ee302 revert: fix gitian builds (Kittywhiskers Van Gogh)
fb00300 revert: drop symlinks in immer subtree (Kittywhiskers Van Gogh)

Pull request description:

  ## Additional Information

  * Dependency for #6380

  #6380 will be using `std::ranges` as a replacement for [dash#4622](#4622) and currently, it will fail to compile due to the current version of `immer` (last updated two years ago in #4911) not meeting constraints ([source](https://en.cppreference.com/w/cpp/language/constraints)) set by `std::ranges` (see below).

  ```
  ./evo/deterministicmns.h:243:16: error: no matching function for call to object of type 'const __count_if_fn'
          return ranges::count_if(mnMap, [](const auto& p) { return IsMNValid(*p.second); });
                 ^~~~~~~~~~~~~~~~
  /usr/bin/../lib/gcc/x86_64-linux-gnu/11/../../../../include/c++/11/bits/ranges_algo.h:331:7: note: candidate template ignored: substitution failure [with _Range = const MnMap &, _Proj = identity, _Pred = (lambda at ./evo/deterministicmns.h:243:40)]: constraints not satisfied for alias template 'range_difference_t' [with _Range = const immer::map<uint256, std::shared_ptr<const CDeterministicMN>, CDeterministicMNList::ImmerHasher> &]
        operator()(_Range&& __r, _Pred __pred, _Proj __proj = {}) const
        ^
  /usr/bin/../lib/gcc/x86_64-linux-gnu/11/../../../../include/c++/11/bits/ranges_algo.h:316:7: note: candidate function template not viable: requires at least 3 arguments, but 2 were provided
        operator()(_Iter __first, _Sent __last,
        ^
  ```

  This has been resolved by updating `immer` to the latest available release, [v0.8.1](https://github.com/arximboldi/immer/releases/tag/v0.8.1).

  Expected subtree hash **without changes** are `a5ded361aec714bc74149909c5e1984c10ab132c4c539c63fe57362dccd95556` (see [here](#6323 (review)) for verification instructions).

  ## Breaking Changes

  None expected.

  ## Checklist

  - [x] I have performed a self-review of my own code **(note: N/A)**
  - [x] I have commented my code, particularly in hard-to-understand areas **(note: N/A)**
  - [x] I have added or updated relevant unit/integration/functional/e2e tests **(note: N/A)**
  - [x] I have made corresponding changes to the documentation **(note: N/A)**
  - [x] I have assigned this pull request to a milestone _(for repository code-owners and collaborators only)_

ACKs for top commit:
  PastaPastaPasta:
    utACK f18e839
  UdjinM6:
    utACK f18e839

Tree-SHA512: 99d1b577eb4cf3fcc3ebfd28f19006700f085d23ccdabe802a2aa5844e4b39314347b0c0e49a352c5fc034d6584a0109edf08fa3c0846514967f1fb16e7f127a
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