[PWGUD] fix ptdiff

[miedema-11]

initialize the GFW objects for pT-diff vn correctly, otherwise it will crash

[github-actions]

O2 linter results: ❌ 0 errors, ⚠️ 0 warnings, 🔕 6 disabled

[alibuild]

Error while checking build/O2Physics/code-check for 1feb8c3 at 2026-07-31 11:30:

## sw/BUILD/O2Physics-code-check-latest/log
--
========== List of issues found ==========
++ echo 'Found 33 errors and 28 warnings.'
Found 33 errors and 28 warnings.
++ [[ 33 -gt 0 ]]
++ cat /sw/BUILD/e0c59136207669e44f2f099659be59a462d64ce1/O2Physics-code-check/errors.txt
PWGUD/Tasks/flowCumulantsUpc.cxx:67:78: error: macro argument should be enclosed in parentheses [bugprone-macro-parentheses,-warnings-as-errors]
PWGUD/Tasks/flowCumulantsUpc.cxx:69:8: error: constructor does not initialize these fields: ccdb [cppcoreguidelines-pro-type-member-init,-warnings-as-errors]
PWGUD/Tasks/flowCumulantsUpc.cxx:245:22: error: 'data' should be used for accessing the data pointer instead of taking the address of the 0-th element [readability-container-data-pointer,-warnings-as-errors]
PWGUD/Tasks/flowCumulantsUpc.cxx:256:5: error: use auto when initializing with new to avoid duplicating the type name [modernize-use-auto,-warnings-as-errors]
PWGUD/Tasks/flowCumulantsUpc.cxx:512:59: error: redundant call to 'c_str' [readability-redundant-string-cstr,-warnings-as-errors]
PWGUD/Tasks/flowCumulantsUpc.cxx:512:92: error: redundant call to 'c_str' [readability-redundant-string-cstr,-warnings-as-errors]
PWGUD/Tasks/flowCumulantsUpc.cxx:515:59: error: redundant call to 'c_str' [readability-redundant-string-cstr,-warnings-as-errors]
PWGUD/Tasks/flowCumulantsUpc.cxx:515:92: error: redundant call to 'c_str' [readability-redundant-string-cstr,-warnings-as-errors]
PWGUD/Tasks/flowCumulantsUpc.cxx:532:12: error: variable 'dnx' is not initialized [cppcoreguidelines-init-variables,-warnings-as-errors]
PWGUD/Tasks/flowCumulantsUpc.cxx:532:17: error: variable 'val' is not initialized [cppcoreguidelines-init-variables,-warnings-as-errors]
PWGUD/Tasks/flowCumulantsUpc.cxx:554:5: error: redundant return statement at the end of a function with a void return type [readability-redundant-control-flow,-warnings-as-errors]
PWGUD/Tasks/flowCumulantsUpc.cxx:559:12: error: variable 'dnx' is not initialized [cppcoreguidelines-init-variables,-warnings-as-errors]
PWGUD/Tasks/flowCumulantsUpc.cxx:559:17: error: variable 'val' is not initialized [cppcoreguidelines-init-variables,-warnings-as-errors]
PWGUD/Tasks/flowCumulantsUpc.cxx:581:5: error: redundant return statement at the end of a function with a void return type [readability-redundant-control-flow,-warnings-as-errors]
PWGUD/Tasks/flowCumulantsUpc.cxx:589:40: error: redundant boolean literal supplied to boolean operator [readability-simplify-boolean-expr,-warnings-as-errors]
PWGUD/Tasks/flowCumulantsUpc.cxx:597:40: error: redundant boolean literal supplied to boolean operator [readability-simplify-boolean-expr,-warnings-as-errors]
PWGUD/Tasks/flowCumulantsUpc.cxx:643:29: error: the parameter 'track' 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]
PWGUD/Tasks/flowCumulantsUpc.cxx:794:22: error: use 'contains' to check for membership [readability-container-contains,-warnings-as-errors]
PWGUD/Tasks/flowCumulantsUpc.cxx:800:26: error: implicit conversion 'unwrap_t<int>' (aka 'int') -> 'bool' [readability-implicit-bool-conversion,-warnings-as-errors]
PWGUD/Tasks/flowCumulantsUpc.cxx:804:20: error: implicit conversion 'unwrap_t<int>' (aka 'int') -> 'bool' [readability-implicit-bool-conversion,-warnings-as-errors]
PWGUD/Tasks/flowCumulantsUpc.cxx:808:24: error: implicit conversion 'unwrap_t<int>' (aka 'int') -> 'bool' [readability-implicit-bool-conversion,-warnings-as-errors]
PWGUD/Tasks/flowCumulantsUpc.cxx:812:20: error: implicit conversion 'unwrap_t<int>' (aka 'int') -> 'bool' [readability-implicit-bool-conversion,-warnings-as-errors]
PWGUD/Tasks/flowCumulantsUpc.cxx:827:34: error: use designated initializer list to initialize 'AcceptedTracks' [modernize-use-designated-initializers,-warnings-as-errors]
PWGUD/Tasks/flowCumulantsUpc.cxx:858:11: error: implicit conversion 'int' -> 'bool' [readability-implicit-bool-conversion,-warnings-as-errors]
PWGUD/Tasks/flowCumulantsUpc.cxx:898:9: error: implicit conversion 'int' -> 'bool' [readability-implicit-bool-conversion,-warnings-as-errors]
PWGUD/Tasks/flowCumulantsUpc.cxx:899:11: error: implicit conversion 'int' -> 'bool' [readability-implicit-bool-conversion,-warnings-as-errors]
PWGUD/Tasks/flowCumulantsUpc.cxx:900:14: error: implicit conversion 'int' -> 'bool' [readability-implicit-bool-conversion,-warnings-as-errors]
PWGUD/Tasks/flowCumulantsUpc.cxx:900:38: error: implicit conversion 'int' -> 'bool' [readability-implicit-bool-conversion,-warnings-as-errors]
PWGUD/Tasks/flowCumulantsUpc.cxx:902:18: error: implicit conversion 'int' -> 'bool' [readability-implicit-bool-conversion,-warnings-as-errors]
PWGUD/Tasks/flowCumulantsUpc.cxx:905:18: error: implicit conversion 'int' -> 'bool' [readability-implicit-bool-conversion,-warnings-as-errors]
PWGUD/Tasks/flowCumulantsUpc.cxx:909:11: error: implicit conversion 'int' -> 'bool' [readability-implicit-bool-conversion,-warnings-as-errors]
PWGUD/Tasks/flowCumulantsUpc.cxx:948:5: error: use auto when initializing with a cast to avoid duplicating the type name [modernize-use-auto,-warnings-as-errors]
PWGUD/Tasks/flowCumulantsUpc.cxx:958:11: error: boolean expression can be simplified by DeMorgan's theorem [readability-simplify-boolean-expr,-warnings-as-errors]
++ [[ 28 -gt 0 ]]
++ cat /sw/BUILD/e0c59136207669e44f2f099659be59a462d64ce1/O2Physics-code-check/warnings.txt
PWGUD/Tasks/flowCumulantsUpc.cxx:263:51: warning: statement should be inside braces [readability-braces-around-statements]
PWGUD/Tasks/flowCumulantsUpc.cxx:265:51: warning: statement should be inside braces [readability-braces-around-statements]
PWGUD/Tasks/flowCumulantsUpc.cxx:267:51: warning: statement should be inside braces [readability-braces-around-statements]
PWGUD/Tasks/flowCumulantsUpc.cxx:273:51: warning: statement should be inside braces [readability-braces-around-statements]
PWGUD/Tasks/flowCumulantsUpc.cxx:280:51: warning: statement should be inside braces [readability-braces-around-statements]
PWGUD/Tasks/flowCumulantsUpc.cxx:287:51: warning: statement should be inside braces [readability-braces-around-statements]
PWGUD/Tasks/flowCumulantsUpc.cxx:303:51: warning: statement should be inside braces [readability-braces-around-statements]
[0 more errors; see full log]

Full log here.

[amatyja]

Hi @miedema-11, Write some description, please!
Best regards
Adam

[miedema-11]

Hi @miedema-11, Write some description, please! Best regards Adam

Hi Adam, I have added. Thank you

[amatyja]

Hi @miedema-11, after some conversation with Roman, it may happen that the HY train will be crashed due to large output. Could you introduce a switch which handle output messages, and output logs are stored only when flag is set to true?
Best regards
Adam