Add signed and floating point literals

[mborland]

Closes: #206
Closes: #207

[cppalliance-bot]

An automated preview of the documentation is available at https://208.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.

2026-05-07 02:25:09 UTC

[codecov]

Codecov Report

❌ Patch coverage is 90.47619% with 14 lines in your changes missing coverage. Please review.
✅ Project coverage is 97.3%. Comparing base (495c76c) to head (de52a9b).

Files with missing lines	Patch %	Lines
include/boost/safe_numbers/literals.hpp	64.8%	10 Missing and 2 partials ⚠️
test/test_float_literals.cpp	93.6%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           develop    #208     +/-   ##
=========================================
- Coverage     97.4%   97.3%   -0.0%     
=========================================
  Files          190     192      +2     
  Lines        14382   14529    +147     
  Branches      5353    5425     +72     
=========================================
+ Hits         13997   14130    +133     
- Misses         316     326     +10     
- Partials        69      73      +4     

Files with missing lines	Coverage Δ
examples/literals.cpp	100.0% <100.0%> (ø)
test/test_signed_literals.cpp	100.0% <100.0%> (ø)
test/test_unsigned_literals.cpp	100.0% <100.0%> (ø)
test/test_float_literals.cpp	93.6% <93.6%> (ø)
include/boost/safe_numbers/literals.hpp	70.7% <64.8%> (-8.4%)	⬇️

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