Implement, document, and test signed bounded integers

[mborland]

Closes: #168

[cppalliance-bot]

An automated preview of the documentation is available at https://171.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.

2026-04-08 15:45:15 UTC

[codecov]

Codecov Report

❌ Patch coverage is 96.96673% with 31 lines in your changes missing coverage. Please review.
✅ Project coverage is 97.3%. Comparing base (c7e8fd5) to head (d70972c).
⚠️ Report is 10 commits behind head on develop.

Files with missing lines	Patch %	Lines
include/boost/safe_numbers/bounded_integers.hpp	83.9%	30 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           develop    #171     +/-   ##
=========================================
+ Coverage     97.1%   97.3%   +0.2%     
=========================================
  Files          141     149      +8     
  Lines        10264   11286   +1022     
  Branches      3720    4014    +294     
=========================================
+ Hits          9962   10972   +1010     
- Misses         236     247     +11     
- Partials        66      67      +1     

Files with missing lines	Coverage Δ
include/boost/safe_numbers/detail/type_traits.hpp	100.0% <ø> (ø)
include/boost/safe_numbers/limits.hpp	100.0% <ø> (ø)
test/test_signed_bounded_addition.cpp	100.0% <100.0%> (ø)
test/test_signed_bounded_construction.cpp	100.0% <100.0%> (ø)
test/test_signed_bounded_conversions.cpp	100.0% <100.0%> (ø)
test/test_signed_bounded_division.cpp	100.0% <100.0%> (ø)
test/test_signed_bounded_modulo.cpp	100.0% <100.0%> (ø)
test/test_signed_bounded_multiplication.cpp	100.0% <100.0%> (ø)
test/test_signed_bounded_subtraction.cpp	100.0% <100.0%> (ø)
test/test_signed_bounded_unary.cpp	100.0% <100.0%> (ø)
... and 1 more

... and 1 file with indirect coverage changes

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