Add midpoint

[mborland]

Closes: #82

[cppalliance-bot]

An automated preview of the documentation is available at https://100.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.

2026-02-20 14:24:08 UTC

[codecov]

Codecov Report

❌ Patch coverage is 53.57143% with 52 lines in your changes missing coverage. Please review.
✅ Project coverage is 68.5%. Comparing base (f974b1a) to head (d85cbcc).
⚠️ Report is 4 commits behind head on develop.

Files with missing lines	Patch %	Lines
test/test_midpoint.cpp	52.3%	0 Missing and 52 partials ⚠️

❌ Your patch status has failed because the patch coverage (53.6%) is below the target coverage (90.0%). You can increase the patch coverage or adjust the target coverage.
❌ Your project status has failed because the head coverage (68.5%) is below the target coverage (90.0%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff            @@
##           develop    #100     +/-   ##
=========================================
- Coverage     68.7%   68.5%   -0.2%     
=========================================
  Files          118     119      +1     
  Lines         7711    7823    +112     
  Branches      2724    2780     +56     
=========================================
+ Hits          5293    5353     +60     
  Misses          56      56             
- Partials      2362    2414     +52     

Files with missing lines	Coverage Δ
include/boost/safe_numbers/numeric.hpp	100.0% <100.0%> (ø)
test/test_midpoint.cpp	52.3% <52.3%> (ø)

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