[PWGLF] gate histogram creation to reduce memory consumption

[GiorgioAlbertoLucia]

No description provided.

[github-actions]

O2 linter results: ❌ 9 errors, ⚠️ 7 warnings, 🔕 0 disabled

[alibuild]

Error while checking build/O2Physics/code-check for 441474a at 2026-08-22 21:16:

## sw/BUILD/O2Physics-code-check-latest/log
--
========== List of issues found ==========
++ echo 'Found 30 errors and 6 warnings.'
Found 30 errors and 6 warnings.
++ [[ 30 -gt 0 ]]
++ cat /sw/BUILD/0eabc695084d3a5b9b6a4dbec868e3b1f1049b02/O2Physics-code-check/errors.txt
PWGLF/TableProducer/Nuspex/he3HadronFemto.cxx:95:22: error: variable 'hEvtMC' is non-const and globally accessible, consider making it const [cppcoreguidelines-avoid-non-const-global-variables,-warnings-as-errors]
PWGLF/TableProducer/Nuspex/he3HadronFemto.cxx:96:22: error: variable 'hImpactParamGen' is non-const and globally accessible, consider making it const [cppcoreguidelines-avoid-non-const-global-variables,-warnings-as-errors]
PWGLF/TableProducer/Nuspex/he3HadronFemto.cxx:97:22: error: variable 'hImpactParamReco' is non-const and globally accessible, consider making it const [cppcoreguidelines-avoid-non-const-global-variables,-warnings-as-errors]
PWGLF/TableProducer/Nuspex/he3HadronFemto.cxx:98:22: error: variable 'hRecoCentrality' is non-const and globally accessible, consider making it const [cppcoreguidelines-avoid-non-const-global-variables,-warnings-as-errors]
PWGLF/TableProducer/Nuspex/he3HadronFemto.cxx:99:22: error: variable 'hImpactParamGenOneReco' is non-const and globally accessible, consider making it const [cppcoreguidelines-avoid-non-const-global-variables,-warnings-as-errors]
PWGLF/TableProducer/Nuspex/he3HadronFemto.cxx:100:22: error: variable 'hGenOneRecoCentrality' is non-const and globally accessible, consider making it const [cppcoreguidelines-avoid-non-const-global-variables,-warnings-as-errors]
PWGLF/TableProducer/Nuspex/he3HadronFemto.cxx:101:17: error: no header providing "TH2" is directly included [misc-include-cleaner,-warnings-as-errors]
PWGLF/TableProducer/Nuspex/he3HadronFemto.cxx:101:22: error: variable 'hGenEventsNchEta05' is non-const and globally accessible, consider making it const [cppcoreguidelines-avoid-non-const-global-variables,-warnings-as-errors]
PWGLF/TableProducer/Nuspex/he3HadronFemto.cxx:102:22: error: variable 'hGenEventsNchEta08' is non-const and globally accessible, consider making it const [cppcoreguidelines-avoid-non-const-global-variables,-warnings-as-errors]
PWGLF/TableProducer/Nuspex/he3HadronFemto.cxx:103:22: error: variable 'hRecoCentralityColvsMultiplicityRecoEta05' is non-const and globally accessible, consider making it const [cppcoreguidelines-avoid-non-const-global-variables,-warnings-as-errors]
PWGLF/TableProducer/Nuspex/he3HadronFemto.cxx:104:22: error: variable 'hRecoCentralityColvsMultiplicityRecoEta08' is non-const and globally accessible, consider making it const [cppcoreguidelines-avoid-non-const-global-variables,-warnings-as-errors]
PWGLF/TableProducer/Nuspex/he3HadronFemto.cxx:105:22: error: variable 'hRecoCentralityColvsMultiplicityFT0C' is non-const and globally accessible, consider making it const [cppcoreguidelines-avoid-non-const-global-variables,-warnings-as-errors]
PWGLF/TableProducer/Nuspex/he3HadronFemto.cxx:106:22: error: variable 'hRecoCentralityColvsImpactParamReco' is non-const and globally accessible, consider making it const [cppcoreguidelines-avoid-non-const-global-variables,-warnings-as-errors]
PWGLF/TableProducer/Nuspex/he3HadronFemto.cxx:107:22: error: variable 'hGenCentralityColvsMultiplicityGenEta05' is non-const and globally accessible, consider making it const [cppcoreguidelines-avoid-non-const-global-variables,-warnings-as-errors]
PWGLF/TableProducer/Nuspex/he3HadronFemto.cxx:108:22: error: variable 'hGenCentralityColvsMultiplicityGenEta08' is non-const and globally accessible, consider making it const [cppcoreguidelines-avoid-non-const-global-variables,-warnings-as-errors]
PWGLF/TableProducer/Nuspex/he3HadronFemto.cxx:109:22: error: variable 'hGenCentralityColvsMultiplicityFT0C' is non-const and globally accessible, consider making it const [cppcoreguidelines-avoid-non-const-global-variables,-warnings-as-errors]
PWGLF/TableProducer/Nuspex/he3HadronFemto.cxx:110:22: error: variable 'hGenCentralityColvsImpactParamGen' is non-const and globally accessible, consider making it const [cppcoreguidelines-avoid-non-const-global-variables,-warnings-as-errors]
PWGLF/TableProducer/Nuspex/he3HadronFemto.cxx:111:22: error: variable 'hGenLi4BeforeEvtSel' is non-const and globally accessible, consider making it const [cppcoreguidelines-avoid-non-const-global-variables,-warnings-as-errors]
PWGLF/TableProducer/Nuspex/he3HadronFemto.cxx:112:22: error: variable 'hGenLi4vsImpactParameterBeforeEvtSel' is non-const and globally accessible, consider making it const [cppcoreguidelines-avoid-non-const-global-variables,-warnings-as-errors]
PWGLF/TableProducer/Nuspex/he3HadronFemto.cxx:113:22: error: variable 'hGenLi4vsMultiplicityGenEta05BeforeEvtSel' is non-const and globally accessible, consider making it const [cppcoreguidelines-avoid-non-const-global-variables,-warnings-as-errors]
PWGLF/TableProducer/Nuspex/he3HadronFemto.cxx:114:22: error: variable 'hGenLi4vsMultiplicityGenEta08BeforeEvtSel' is non-const and globally accessible, consider making it const [cppcoreguidelines-avoid-non-const-global-variables,-warnings-as-errors]
PWGLF/TableProducer/Nuspex/he3HadronFemto.cxx:115:22: error: variable 'hGenLi4vsMultiplicityFT0CBeforeEvtSel' is non-const and globally accessible, consider making it const [cppcoreguidelines-avoid-non-const-global-variables,-warnings-as-errors]
PWGLF/TableProducer/Nuspex/he3HadronFemto.cxx:116:22: error: variable 'hGenLi4AfterSel' is non-const and globally accessible, consider making it const [cppcoreguidelines-avoid-non-const-global-variables,-warnings-as-errors]
PWGLF/TableProducer/Nuspex/he3HadronFemto.cxx:117:22: error: variable 'hGenLi4vsImpactParameterAfterSel' is non-const and globally accessible, consider making it const [cppcoreguidelines-avoid-non-const-global-variables,-warnings-as-errors]
PWGLF/TableProducer/Nuspex/he3HadronFemto.cxx:118:22: error: variable 'hGenLi4vsMultiplicityGenEta05AfterSel' is non-const and globally accessible, consider making it const [cppcoreguidelines-avoid-non-const-global-variables,-warnings-as-errors]
PWGLF/TableProducer/Nuspex/he3HadronFemto.cxx:119:22: error: variable 'hGenLi4vsMultiplicityGenEta08AfterSel' is non-const and globally accessible, consider making it const [cppcoreguidelines-avoid-non-const-global-variables,-warnings-as-errors]
PWGLF/TableProducer/Nuspex/he3HadronFemto.cxx:120:22: error: variable 'hGenLi4vsMultiplicityFT0CAfterSel' is non-const and globally accessible, consider making it const [cppcoreguidelines-avoid-non-const-global-variables,-warnings-as-errors]
PWGLF/TableProducer/Nuspex/he3HadronFemto.cxx:303:8: error: constructor does not initialize these fields: mCcdb [cppcoreguidelines-pro-type-member-init,-warnings-as-errors]
PWGLF/TableProducer/Nuspex/he3HadronFemto.cxx:340:85: error: do not implicitly decay an array into a pointer; consider using gsl::array_view or an explicit cast instead [cppcoreguidelines-pro-bounds-array-to-pointer-decay,-warnings-as-errors]
PWGLF/TableProducer/Nuspex/he3HadronFemto.cxx:523:23: error: no header providing "TH3" is directly included [misc-include-cleaner,-warnings-as-errors]
++ [[ 6 -gt 0 ]]
++ cat /sw/BUILD/0eabc695084d3a5b9b6a4dbec868e3b1f1049b02/O2Physics-code-check/warnings.txt
PWGLF/TableProducer/Nuspex/he3HadronFemto.cxx:678:14: warning: redundant boolean literal in conditional return statement [readability-simplify-boolean-expr]
PWGLF/TableProducer/Nuspex/he3HadronFemto.cxx:730:14: warning: redundant boolean literal in conditional return statement [readability-simplify-boolean-expr]
PWGLF/TableProducer/Nuspex/he3HadronFemto.cxx:782:7: warning: do not use 'else' after 'return' [readability-else-after-return]
PWGLF/TableProducer/Nuspex/he3HadronFemto.cxx:1620:41: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/TableProducer/Nuspex/he3HadronFemto.cxx:1622:53: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/TableProducer/Nuspex/he3HadronFemto.cxx:1642:57: warning: statement should be inside braces [readability-braces-around-statements]
++ [[ 30 -gt 0 ]]
++ exit 1
--

[0 more errors; see full log]

Full log here.