docs/checks/README-unused-non-trivial-variable.md

0001 # unused-non-trivial-variable
0002
0003  Warns about unused Qt value classes.
0004  Compilers usually only warn when trivial classes are unused and don't emit warnings for non-trivial classes.
0005
0006  This check has a whitelist of common Qt classes such as containers, `QFont`, `QUrl`, etc and warns for those too.
0007
0008  See `UnusedNonTrivialType::isInterestingType(QualType t)` for a list of all types.
0009
0010  It's possible to extend the whitelist with user types, by setting the env variable `CLAZY_UNUSED_NON_TRIVIAL_VARIABLE_WHITELIST`.
0011  It accepts a comma separate name of types.
0012
0013  It's possible to disable the whitelist via exporting `CLAZY_EXTRA_OPTIONS=unused-non-trivial-variable-no-whitelist`,
0014  when this env variable is set clazy will warn for any unused non-trivial type. This will create many false positives,
0015  such as RAII classes, but still useful to run at least once on your codebase. When disabling the whitelist this way it's also possible
0016  to black list types, by setting a comma separated list of types to `CLAZY_UNUSED_NON_TRIVIAL_VARIABLE_BLACKLIST`