[PWGDQ] implementing a posteriori 3D vertex shift for forward tracks

[mcoquet642]

No description provided.

[github-actions]

O2 linter results: ❌ 111 errors, ⚠️ 732 warnings, 🔕 0 disabled

[alibuild]

Error while checking build/O2Physics/code-check for 18a6cae at 2026-08-03 14:21:

## sw/BUILD/O2Physics-code-check-latest/log
--
========== List of issues found ==========
++ echo 'Found 95 errors and 0 warnings.'
Found 95 errors and 0 warnings.
++ [[ 95 -gt 0 ]]
++ cat /sw/BUILD/d47cee4e249b4582dc8001e5c19dda085f3224dc/O2Physics-code-check/errors.txt
PWGDQ/Core/VarManager.cxx:51:1: error: do not declare C-style arrays, use 'std::array' instead [modernize-avoid-c-arrays,-warnings-as-errors]
PWGDQ/Core/VarManager.cxx:52:1: error: do not declare C-style arrays, use 'std::array' instead [modernize-avoid-c-arrays,-warnings-as-errors]
PWGDQ/Core/VarManager.cxx:54:1: error: do not declare C-style arrays, use 'std::array' instead [modernize-avoid-c-arrays,-warnings-as-errors]
PWGDQ/Core/VarManager.cxx:62:1: error: do not declare C-style arrays, use 'std::array' instead [modernize-avoid-c-arrays,-warnings-as-errors]
PWGDQ/Core/VarManager.cxx:88:28: error: initializer for base class 'TObject' is redundant [readability-redundant-member-init,-warnings-as-errors]
PWGDQ/Core/VarManager.cxx:142:14: 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]
PWGDQ/Core/VarManager.cxx:150:45: error: the parameter 'system' is copied for each invocation but only used as a const reference; consider making it a const reference [performance-unnecessary-value-param,-warnings-as-errors]
PWGDQ/Core/VarManager.cxx:203:43: error: result of integer division used in a floating point context; possible loss of precision [bugprone-integer-division,-warnings-as-errors]
PWGDQ/Core/VarManager.cxx:204:43: error: result of integer division used in a floating point context; possible loss of precision [bugprone-integer-division,-warnings-as-errors]
PWGDQ/Core/VarManager.cxx:246:45: error: the parameter 'kfp' is copied for each invocation but only used as a const reference; consider making it a const reference [performance-unnecessary-value-param,-warnings-as-errors]
PWGDQ/Core/VarManager.cxx:246:61: error: the parameter 'PV' is copied for each invocation but only used as a const reference; consider making it a const reference [performance-unnecessary-value-param,-warnings-as-errors]
PWGDQ/Core/VarManager.cxx:259:18: error: variable 'calibMean' is not initialized [cppcoreguidelines-init-variables,-warnings-as-errors]
PWGDQ/Core/VarManager.cxx:259:29: error: variable 'calibSigma' is not initialized [cppcoreguidelines-init-variables,-warnings-as-errors]
PWGDQ/Core/VarManager.cxx:282:27: error: do not use reinterpret_cast [cppcoreguidelines-pro-type-reinterpret-cast,-warnings-as-errors]
PWGDQ/Core/VarManager.cxx:283:28: error: do not use reinterpret_cast [cppcoreguidelines-pro-type-reinterpret-cast,-warnings-as-errors]
PWGDQ/Core/VarManager.cxx:303:5: error: do not use 'else' after 'return' [readability-else-after-return,-warnings-as-errors]
PWGDQ/Core/VarManager.cxx:305:18: error: variable 'calibMean' is not initialized [cppcoreguidelines-init-variables,-warnings-as-errors]
PWGDQ/Core/VarManager.cxx:305:29: error: variable 'calibSigma' is not initialized [cppcoreguidelines-init-variables,-warnings-as-errors]
PWGDQ/Core/VarManager.cxx:305:41: error: variable 'calibStatus' is not initialized [cppcoreguidelines-init-variables,-warnings-as-errors]
PWGDQ/Core/VarManager.cxx:332:27: error: do not use reinterpret_cast [cppcoreguidelines-pro-type-reinterpret-cast,-warnings-as-errors]
PWGDQ/Core/VarManager.cxx:333:28: error: do not use reinterpret_cast [cppcoreguidelines-pro-type-reinterpret-cast,-warnings-as-errors]
PWGDQ/Core/VarManager.cxx:334:29: error: do not use reinterpret_cast [cppcoreguidelines-pro-type-reinterpret-cast,-warnings-as-errors]
PWGDQ/Core/VarManager.cxx:354:5: error: do not declare C-style arrays, use 'std::array' instead [modernize-avoid-c-arrays,-warnings-as-errors]
PWGDQ/Core/VarManager.cxx:355:66: 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]
PWGDQ/Core/VarManager.cxx:356:48: 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]
PWGDQ/Core/VarManager.cxx:357:50: 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]
PWGDQ/Core/VarManager.cxx:377:7: error: switch has 2 consecutive identical branches [bugprone-branch-clone,-warnings-as-errors]
PWGDQ/Core/VarManager.cxx:411:14: 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]
PWGDQ/Core/VarManager.cxx:422:28: error: do not use reinterpret_cast [cppcoreguidelines-pro-type-reinterpret-cast,-warnings-as-errors]
PWGDQ/Core/VarManager.cxx:442:28: error: do not use reinterpret_cast [cppcoreguidelines-pro-type-reinterpret-cast,-warnings-as-errors]
PWGDQ/Core/VarManager.cxx:478:5: error: do not use 'else' after 'return' [readability-else-after-return,-warnings-as-errors]
PWGDQ/Core/VarManager.cxx:544:9: error: variable 'diff' is not initialized [cppcoreguidelines-init-variables,-warnings-as-errors]
PWGDQ/Core/VarManager.cxx:544:15: error: variable 'diff2' is not initialized [cppcoreguidelines-init-variables,-warnings-as-errors]
PWGDQ/Core/VarManager.cxx:691:9: error: variable 'diff' is not initialized [cppcoreguidelines-init-variables,-warnings-as-errors]
PWGDQ/Core/VarManager.cxx:691:15: error: variable 'diff2' is not initialized [cppcoreguidelines-init-variables,-warnings-as-errors]
PWGDQ/Core/VarManager.cxx:691:22: error: variable 'binCenter' is not initialized [cppcoreguidelines-init-variables,-warnings-as-errors]
PWGDQ/Core/VarManager.h:1205:10: error: do not declare C-style arrays, use 'std::array' instead [modernize-avoid-c-arrays,-warnings-as-errors]
PWGDQ/Core/VarManager.h:1206:10: error: do not declare C-style arrays, use 'std::array' instead [modernize-avoid-c-arrays,-warnings-as-errors]
PWGDQ/Core/VarManager.h:1545:15: error: function 'VarManager::SetPhiMap' has a definition with different parameter names [readability-inconsistent-declaration-parameter-name,-warnings-as-errors]
PWGDQ/Core/VarManager.h:1576:10: error: do not declare C-style arrays, use 'std::array' instead [modernize-avoid-c-arrays,-warnings-as-errors]
PWGDQ/Core/VarManager.h:1580:10: error: do not declare C-style arrays, use 'std::array' instead [modernize-avoid-c-arrays,-warnings-as-errors]
PWGDQ/Core/VarManager.h:1817:14: 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]
[0 more errors; see full log]

Full log here.

[alibuild]

Auto-approving on behalf of @mcoquet642.