Wait till say_hello() has completed

[roland-wolf]

The join statement removes the race between thread_pool and main thread.

[cppalliance-bot]

An automated preview of the documentation is available at https://312.capy.prtest3.cppalliance.org/index.html

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

2026-06-15 09:47:09 UTC

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.09%. Comparing base (7f2dc8e) to head (d9743d3).
⚠️ Report is 1 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #312   +/-   ##
========================================
  Coverage    98.09%   98.09%           
========================================
  Files          164      164           
  Lines         8873     8873           
========================================
  Hits          8704     8704           
  Misses         169      169           

Flag	Coverage Δ
linux	98.19% <ø> (ø)

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[cppalliance-bot]

GCOVR code coverage report https://312.capy.prtest3.cppalliance.org/gcovr/index.html
LCOV code coverage report https://312.capy.prtest3.cppalliance.org/genhtml/index.html
Coverage Diff Report https://312.capy.prtest3.cppalliance.org/diff-report/index.html

Build time: 2026-06-15 10:01:10 UTC