[PWGDQ] add event mixing for Dalitz selection

[glegras]

No description provided.

[github-actions]

O2 linter results: ❌ 25 errors, ⚠️ 3 warnings, 🔕 0 disabled

[alibuild]

Error while checking build/O2Physics/code-check for 596c1dd at 2026-07-22 18:49:

## sw/BUILD/O2Physics-code-check-latest/log
--
========== List of issues found ==========
++ echo 'Found 32 errors and 0 warnings.'
Found 32 errors and 0 warnings.
++ [[ 32 -gt 0 ]]
++ cat /sw/BUILD/0bb991db6d0d40649732055473525825e9e47e26/O2Physics-code-check/errors.txt
PWGDQ/Tasks/DalitzSelection.cxx:250:34: 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/Tasks/DalitzSelection.cxx:250:63: 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/Tasks/DalitzSelection.cxx:417:31: 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/Tasks/DalitzSelection.cxx:425:33: 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/Tasks/DalitzSelection.cxx:536:37: 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/Tasks/DalitzSelection.cxx:566:147: 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/Tasks/DalitzSelection.cxx:575:108: 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/Tasks/DalitzSelection.cxx:580:232: 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/Tasks/DalitzSelection.cxx:591:17: error: variable 'filterMap' is not initialized [cppcoreguidelines-init-variables,-warnings-as-errors]
PWGDQ/Tasks/DalitzSelection.cxx:592:17: error: variable 'filterMapProbe' is not initialized [cppcoreguidelines-init-variables,-warnings-as-errors]
PWGDQ/Tasks/DalitzSelection.cxx:656:241: 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/Tasks/DalitzSelection.cxx:660:153: 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/Tasks/DalitzSelection.cxx:670:74: 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/Tasks/DalitzSelection.cxx:677:12: error: implicit conversion 'uint32_t' (aka 'unsigned int') -> 'bool' [readability-implicit-bool-conversion,-warnings-as-errors]
PWGDQ/Tasks/DalitzSelection.cxx:686:11: error: use auto when initializing with a cast to avoid duplicating the type name [modernize-use-auto,-warnings-as-errors]
PWGDQ/Tasks/DalitzSelection.cxx:687:16: error: implicit conversion 'uint8_t' (aka 'unsigned char') -> 'bool' [readability-implicit-bool-conversion,-warnings-as-errors]
PWGDQ/Tasks/DalitzSelection.cxx:699:16: error: no header providing "size_t" is directly included [misc-include-cleaner,-warnings-as-errors]
PWGDQ/Tasks/DalitzSelection.cxx:700:17: error: implicit conversion 'int' -> 'bool' [readability-implicit-bool-conversion,-warnings-as-errors]
PWGDQ/Tasks/DalitzSelection.cxx:700:108: 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/Tasks/DalitzSelection.cxx:703:165: 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/Tasks/DalitzSelection.cxx:705:167: 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/Tasks/DalitzSelection.cxx:709:126: 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/Tasks/DalitzSelection.cxx:711:128: 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/Tasks/DalitzSelection.cxx:722:13: error: use auto when initializing with a cast to avoid duplicating the type name [modernize-use-auto,-warnings-as-errors]
PWGDQ/Tasks/DalitzSelection.cxx:723:18: error: implicit conversion 'uint8_t' (aka 'unsigned char') -> 'bool' [readability-implicit-bool-conversion,-warnings-as-errors]
PWGDQ/Tasks/DalitzSelection.cxx:736:19: error: implicit conversion 'int' -> 'bool' [readability-implicit-bool-conversion,-warnings-as-errors]
PWGDQ/Tasks/DalitzSelection.cxx:736:110: 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/Tasks/DalitzSelection.cxx:738:165: 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/Tasks/DalitzSelection.cxx:740:167: 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/Tasks/DalitzSelection.cxx:840:15: error: the 'empty' method should be used to check for emptiness instead of 'size' [readability-container-size-empty,-warnings-as-errors]
PWGDQ/Tasks/DalitzSelection.cxx:901:15: error: the 'empty' method should be used to check for emptiness instead of 'size' [readability-container-size-empty,-warnings-as-errors]
PWGDQ/Tasks/DalitzSelection.cxx:963:15: error: the 'empty' method should be used to check for emptiness instead of 'size' [readability-container-size-empty,-warnings-as-errors]
++ [[ 0 -gt 0 ]]
++ [[ 32 -gt 0 ]]
++ exit 1
--

Full log here.

[alibuild]

Error while checking build/O2Physics/code-check for e5325f2 at 2026-07-23 17:52:

## sw/BUILD/O2Physics-code-check-latest/log
--
========== List of issues found ==========
++ echo 'Found 2 errors and 0 warnings.'
Found 2 errors and 0 warnings.
++ [[ 2 -gt 0 ]]
++ cat /sw/BUILD/1bede38ebd31d4e2381b6cfd50886611b0337027/O2Physics-code-check/errors.txt
PWGDQ/Tasks/DalitzSelection.cxx:250:34: 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/Tasks/DalitzSelection.cxx:250:63: 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 -gt 0 ]]
++ [[ 2 -gt 0 ]]
++ exit 1
--

Full log here.