refactor(resolver): replace resolver_results wrapper with a type alias

[mvandeberg]

resolver_results was a shared_ptr<vector<resolver_entry>> wrapper that gave O(1) copies and an identity-based operator==. The equality ops were never used, and the only by-value sink (connect) must own the range for coroutine safety regardless, so an rvalue is moved in cheaply either way.

Make resolver_results an alias for std::vector<resolver_entry>: deletes the wrapper boilerplate and exposes the full vector interface. The one regression — deep-copying an lvalue you want to retain — is documented on resolve() and connect(), which point callers at std::move or the iterator-based connect overloads. Closes #123.

[cppalliance-bot]

An automated preview of the documentation is available at https://278.corosio.prtest3.cppalliance.org/index.html

If more commits are pushed to the pull request, the docs will rebuild at the same URL.

2026-06-12 20:28:52 UTC

[cppalliance-bot]

GCOVR code coverage report https://278.corosio.prtest3.cppalliance.org/gcovr/index.html
LCOV code coverage report https://278.corosio.prtest3.cppalliance.org/genhtml/index.html
Coverage Diff Report https://278.corosio.prtest3.cppalliance.org/diff-report/index.html

Build time: 2026-06-12 20:41:06 UTC

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.65%. Comparing base (069ba7e) to head (f4ebe8d).
⚠️ Report is 10 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #278      +/-   ##
===========================================
- Coverage    77.73%   77.65%   -0.08%     
===========================================
  Files           96       96              
  Lines         7234     7204      -30     
  Branches      1764     1758       -6     
===========================================
- Hits          5623     5594      -29     
  Misses        1102     1102              
+ Partials       509      508       -1     

Files with missing lines	Coverage Δ
...orosio/native/detail/iocp/win_resolver_service.hpp	69.56% <ø> (+0.30%)	⬆️
...sio/native/detail/posix/posix_resolver_service.hpp	81.40% <ø> (-0.07%)	⬇️
include/boost/corosio/native/native_resolver.hpp	92.85% <ø> (ø)
include/boost/corosio/resolver.hpp	95.06% <ø> (ø)
include/boost/corosio/resolver_results.hpp	100.00% <ø> (ø)

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