Resolve cppcoreguidelines-explicit-virtual-functions

[vil02]

This PR resolves cppcoreguidelines-explicit-virtual-functions.

Cf. also: CppCoreGuidelines.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.02%. Comparing base (c6fbd34) to head (3e66475).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #546      +/-   ##
==========================================
- Coverage   97.05%   97.02%   -0.04%     
==========================================
  Files          97       97              
  Lines       11585    11585              
  Branches      768      768              
==========================================
- Hits        11244    11240       -4     
- Misses        341      345       +4     

Flag	Coverage Δ
unittests	97.02% <100.00%> (-0.04%)	⬇️

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