Add log2 function

[mborland]

Closes: #57

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.0%. Comparing base (fb44206) to head (def4ce8).
⚠️ Report is 4 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff            @@
##           develop     #65     +/-   ##
=========================================
+ Coverage     99.0%   99.0%   +0.1%     
=========================================
  Files          103     104      +1     
  Lines         6550    6632     +82     
  Branches      2199    2242     +43     
=========================================
+ Hits          6481    6563     +82     
  Misses          22      22             
  Partials        47      47             

Files with missing lines	Coverage Δ
include/boost/safe_numbers/integer_utilities.hpp	100.0% <100.0%> (ø)
test/test_log2.cpp	100.0% <100.0%> (ø)

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[cppalliance-bot]

An automated preview of the documentation is available at https://65.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.

2026-02-17 13:24:58 UTC