Potential proposal for 1384

[ckormanyos]

Here is a potential proposal to solve #1384. It uses fowrward declarations only.

I think it would still be wise to combine these forward declarations additionally with the consistent use of namespace-decorated log-functions in the internal headers of Decimal's cmath.

Cc: @mborland

[codecov]

Codecov Report

❌ Patch coverage is 96.42857% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 98.6%. Comparing base (e995162) to head (f994f3a).

Files with missing lines	Patch %	Lines
test/github_issue_1384.cpp	87.5%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           develop   #1385     +/-   ##
=========================================
- Coverage     98.6%   98.6%   -0.0%     
=========================================
  Files          285     286      +1     
  Lines        22698   22706      +8     
  Branches      1974    1975      +1     
=========================================
+ Hits         22365   22369      +4     
- Misses         333     337      +4     

Files with missing lines	Coverage Δ
include/boost/decimal/cmath.hpp	100.0% <ø> (ø)
include/boost/decimal/detail/cmath/acosh.hpp	100.0% <100.0%> (ø)
include/boost/decimal/detail/cmath/asinh.hpp	100.0% <100.0%> (ø)
include/boost/decimal/detail/cmath/atanh.hpp	100.0% <100.0%> (ø)
...de/boost/decimal/detail/cmath/impl/ellint_impl.hpp	100.0% <100.0%> (ø)
include/boost/decimal/detail/cmath/lgamma.hpp	100.0% <100.0%> (ø)
include/boost/decimal/detail/cmath/log.hpp	100.0% <100.0%> (ø)
include/boost/decimal/detail/cmath/log10.hpp	100.0% <100.0%> (ø)
include/boost/decimal/detail/cmath/log1p.hpp	100.0% <100.0%> (ø)
include/boost/decimal/detail/cmath/log2.hpp	100.0% <100.0%> (ø)
... and 4 more

... and 3 files with indirect coverage changes

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