Add div_ceil function

[mborland]

Closes: #85

[cppalliance-bot]

An automated preview of the documentation is available at https://106.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 20:39:16 UTC

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.6%. Comparing base (712a5f8) to head (bb0973f).
⚠️ Report is 4 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff            @@
##           develop    #106     +/-   ##
=========================================
+ Coverage     98.5%   98.6%   +0.1%     
=========================================
  Files          114     115      +1     
  Lines         7654    7756    +102     
  Branches      2746    2800     +54     
=========================================
+ Hits          7539    7641    +102     
  Misses          42      42             
  Partials        73      73             

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

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