Simplify syntax cpp_double_fp_backend

[ckormanyos]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.2%. Comparing base (6ec5a7d) to head (156e03e).
⚠️ Report is 5 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff            @@
##           develop    #739     +/-   ##
=========================================
- Coverage     96.2%   96.2%   -0.0%     
=========================================
  Files          300     300             
  Lines        31349   31384     +35     
=========================================
+ Hits         30141   30174     +33     
- Misses        1208    1210      +2     

Files with missing lines	Coverage Δ
...precision/cpp_df_qf/cpp_df_qf_detail_constants.hpp	100.0% <ø> (ø)
include/boost/multiprecision/cpp_double_fp.hpp	100.0% <100.0%> (ø)
...est_cpp_double_float_bessel_versus_bin_and_dec.cpp	100.0% <100.0%> (ø)
test/test_various_edges_more.cpp	100.0% <100.0%> (ø)

... and 1 file with indirect coverage changes

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