Add next_multiple_of function

[mborland]

Closes: #86

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.5%. Comparing base (69453cb) to head (290d2fd).
⚠️ Report is 4 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff            @@
##           develop    #110     +/-   ##
=========================================
+ Coverage     98.5%   98.5%   +0.1%     
=========================================
  Files          102     103      +1     
  Lines         6850    6951    +101     
  Branches      2478    2533     +55     
=========================================
+ Hits          6742    6843    +101     
  Misses          42      42             
  Partials        66      66             

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

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[cppalliance-bot]

An automated preview of the documentation is available at https://110.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.

2026-02-24 16:51:07 UTC