Add non-standard bit swap function

[mborland]

Closes: #87

[cppalliance-bot]

An automated preview of the documentation is available at https://103.safe-numbers.prtest3.cppalliance.org/libs/safe_numbers/doc/html/index.html

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

2026-02-23 19:19:12 UTC

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.5%. Comparing base (9c923f5) to head (c5f9474).
⚠️ Report is 11 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff            @@
##           develop    #103     +/-   ##
=========================================
- Coverage     99.6%   98.5%   -1.0%     
=========================================
  Files          113     113             
  Lines         6629    7554    +925     
  Branches         0    2697   +2697     
=========================================
+ Hits          6601    7439    +838     
- Misses          28      42     +14     
- Partials         0      73     +73     

Files with missing lines	Coverage Δ
examples/bit.cpp	100.0% <100.0%> (ø)
include/boost/safe_numbers/bit.hpp	100.0% <100.0%> (ø)
test/test_bit.cpp	100.0% <100.0%> (ø)
test/test_verified_bit.cpp	100.0% <ø> (ø)

... and 108 files with indirect coverage changes

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