[altsybee]

EventSelectionModule: factorize the occupancy calculation into OccupancyCalculator

• The occupancy calculation is moved from EventSelectionModule::processRun3 into a new class OccupancyCalculator:
  • OccupancyCalculator::Source (per-collision inputs) and OccupancyCalculator::Result
    (occupancy estimators and flags);
  • calculate(refGlobalBC, refVz, ...) computes the occupancy wrt a reference BC, so the same
    code can later provide occupancy at the BC level; calculateForSource(i, ...) is the
    collision-level call used in processRun3.
• processRun3 fills the per-collision inputs and takes the occupancy values and flags from the
  calculator; the per-collision temporary vectors (and vectors of vectors) are removed.
• The outputs are identical to those from previous calculations; checked with Pb-Pb, OO, pp.
• Occupancy calculation is now faster by ~x2, mainly due to avoiding per-collision heap allocations.

[github-actions]

O2 linter results: ❌ 0 errors, ⚠️ 0 warnings, 🔕 57 disabled

[alibuild]

Error while checking build/O2Physics/o2 for 524cc34 at 2026-11-06 17:54:

No log files found

Full log here.

[alibuild]

Error while checking build/O2Physics/code-check for 524cc34 at 2026-11-06 17:58:

## sw/BUILD/O2Physics-code-check-latest/log
--
========== List of issues found ==========
++ echo 'To reproduce the results below locally, run: '\''aliBuild build O2Physics-code-check -e ALIBUILD_BASE_HASH=upstream/master'\''.'
To reproduce the results below locally, run: 'aliBuild build O2Physics-code-check -e ALIBUILD_BASE_HASH=upstream/master'.
++ echo 'To apply all automatic fixes, add the '\''-e O2PHYSICS_CHECKER_FIX=1'\'' option.'
To apply all automatic fixes, add the '-e O2PHYSICS_CHECKER_FIX=1' option.
++ echo 'See the documentation for more details at: <https://aliceo2group.github.io/analysis-framework/docs/tools/#running-with-o2physics-code-check>.'
See the documentation for more details at: <https://aliceo2group.github.io/analysis-framework/docs/tools/#running-with-o2physics-code-check>.
++ echo 'Found 1 errors and 91 warnings.'
Found 1 errors and 91 warnings.
++ [[ 1 -gt 0 ]]
++ cat /sw/BUILD/b3cc4426fa23fa0bb955fbc5a6d2d5f53cdbe213/O2Physics-code-check/errors.txt
Common/Tools/EventSelectionModule.h:57:1: error: included header numeric is not used directly [misc-include-cleaner,-warnings-as-errors]
++ [[ 91 -gt 0 ]]
++ cat /sw/BUILD/b3cc4426fa23fa0bb955fbc5a6d2d5f53cdbe213/O2Physics-code-check/warnings.txt
Common/Tools/EventSelectionModule.h:62:9: warning: function-like macro 'BITCHECK' used; consider a 'constexpr' template function [cppcoreguidelines-macro-usage]
Common/Tools/EventSelectionModule.h:63:9: warning: function-like macro 'BITCHECK64' used; consider a 'constexpr' template function [cppcoreguidelines-macro-usage]
Common/Tools/EventSelectionModule.h:68:1: warning: nested namespaces can be concatenated [modernize-concat-nested-namespaces]
Common/Tools/EventSelectionModule.h:140:3: warning: use '= default' to define a trivial default constructor [modernize-use-equals-default]
Common/Tools/EventSelectionModule.h:161:15: warning: redundant string initialization [readability-redundant-string-init]
Common/Tools/EventSelectionModule.h:162:15: warning: redundant string initialization [readability-redundant-string-init]
Common/Tools/EventSelectionModule.h:355:20: warning: boolean expression can be simplified by DeMorgan's theorem [readability-simplify-boolean-expr]
Common/Tools/EventSelectionModule.h:356:20: warning: boolean expression can be simplified by DeMorgan's theorem [readability-simplify-boolean-expr]
Common/Tools/EventSelectionModule.h:357:20: warning: boolean expression can be simplified by DeMorgan's theorem [readability-simplify-boolean-expr]
Common/Tools/EventSelectionModule.h:358:20: warning: boolean expression can be simplified by DeMorgan's theorem [readability-simplify-boolean-expr]
Common/Tools/EventSelectionModule.h:363:20: warning: boolean expression can be simplified by DeMorgan's theorem [readability-simplify-boolean-expr]
Common/Tools/EventSelectionModule.h:364:20: warning: boolean expression can be simplified by DeMorgan's theorem [readability-simplify-boolean-expr]
Common/Tools/EventSelectionModule.h:368:7: warning: do not declare C-style arrays, use 'std::array' instead [modernize-avoid-c-arrays]
Common/Tools/EventSelectionModule.h:369:7: warning: do not declare C-style arrays, use 'std::array' instead [modernize-avoid-c-arrays]
Common/Tools/EventSelectionModule.h:399:109: warning: narrowing conversion from 'float' to 'bool' [bugprone-narrowing-conversions]
Common/Tools/EventSelectionModule.h:452:31: warning: statement should be inside braces [readability-braces-around-statements]
Common/Tools/EventSelectionModule.h:466:38: warning: statement should be inside braces [readability-braces-around-statements]
Common/Tools/EventSelectionModule.h:529:20: warning: boolean expression can be simplified by DeMorgan's theorem [readability-simplify-boolean-expr]
Common/Tools/EventSelectionModule.h:530:20: warning: boolean expression can be simplified by DeMorgan's theorem [readability-simplify-boolean-expr]
Common/Tools/EventSelectionModule.h:531:20: warning: boolean expression can be simplified by DeMorgan's theorem [readability-simplify-boolean-expr]
Common/Tools/EventSelectionModule.h:532:20: warning: boolean expression can be simplified by DeMorgan's theorem [readability-simplify-boolean-expr]
Common/Tools/EventSelectionModule.h:533:20: warning: boolean expression can be simplified by DeMorgan's theorem [readability-simplify-boolean-expr]
Common/Tools/EventSelectionModule.h:539:20: warning: boolean expression can be simplified by DeMorgan's theorem [readability-simplify-boolean-expr]
Common/Tools/EventSelectionModule.h:540:20: warning: boolean expression can be simplified by DeMorgan's theorem [readability-simplify-boolean-expr]
Common/Tools/EventSelectionModule.h:555:11: warning: the 'empty' method should be used to check for emptiness instead of 'size' [readability-container-size-empty]
Common/Tools/EventSelectionModule.h:558:19: warning: statement should be inside braces [readability-braces-around-statements]
Common/Tools/EventSelectionModule.h:562:54: warning: statement should be inside braces [readability-braces-around-statements]
Common/Tools/EventSelectionModule.h:675:30: warning: statement should be inside braces [readability-braces-around-statements]
Common/Tools/EventSelectionModule.h:677:34: warning: statement should be inside braces [readability-braces-around-statements]
Common/Tools/EventSelectionModule.h:679:34: warning: statement should be inside braces [readability-braces-around-statements]
Common/Tools/EventSelectionModule.h:681:35: warning: statement should be inside braces [readability-braces-around-statements]
Common/Tools/EventSelectionModule.h:716:53: warning: statement should be inside braces [readability-braces-around-statements]
Common/Tools/EventSelectionModule.h:718:63: warning: statement should be inside braces [readability-braces-around-statements]
[0 more errors; see full log]

Full log here.