Fix bitmap base

[Alex-PLACET]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.05%. Comparing base (339258b) to head (23eea58).
⚠️ Report is 21 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #518   +/-   ##
=======================================
  Coverage   88.05%   88.05%           
=======================================
  Files         100      100           
  Lines        7466     7466           
=======================================
  Hits         6574     6574           
  Misses        892      892           

Flag	Coverage Δ
unittests	88.05% <ø> (ø)

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[JohanMabille]

This looks more like a workaround than a fix, the initial syntax is C++20 compliant. Which compiler is complaining with it?