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---
# Configure clang-tidy for this project.
# Here is an explanation for why some of the checks are disabled:
#
# -google-readability-namespace-comments: the *_CLIENT_NS is a macro, and
# clang-tidy fails to match it against the initial value.
#
# -modernize-use-trailing-return-type: clang-tidy recommends using
# `auto Foo() -> std::string { return ...; }`, we think the code is less
# readable in this form.
#
# -modernize-return-braced-init-list: We think removing typenames and using
# only braced-init can hurt readability.
#
# -modernize-avoid-c-arrays: We only use C arrays when they seem to be the
# right tool for the job, such as `char foo[] = "hello"`. In these cases,
# avoiding C arrays often makes the code less readable, and std::array is
# not a drop-in replacement because it doesn't deduce the size.
#
# -performance-move-const-arg: This warning requires the developer to
# know/care more about the implementation details of types/functions than
# should be necessary. For example, `A a; F(std::move(a));` will trigger a
# warning IFF `A` is a trivial type (and therefore the move is
# meaningless). It would also warn if `F` accepts by `const&`, which is
# another detail that the caller need not care about.
#
# -readability-redundant-declaration: A friend declaration inside a class
# counts as a declaration, so if we also declare that friend outside the
# class in order to document it as part of the public API, that will
# trigger a redundant declaration warning from this check.
#
# -readability-function-cognitive-complexity: too many false positives with
# clang-tidy-12. We need to disable this check in macros, and that setting
# only appears in clang-tidy-13.
#
# -bugprone-narrowing-conversions: too many false positives around
# `std::size_t` vs. `*::difference_type`.
#
# -bugprone-easily-swappable-parameters: too many false positives.
#
# -bugprone-implicit-widening-of-multiplication-result: too many false positives.
# Almost any expression of the form `2 * variable` or `long x = a_int * b_int;`
# generates an error.
#
# -bugprone-unchecked-optional-access: too many false positives in tests.
# Despite what the documentation says, this warning appears after
# `ASSERT_TRUE(variable)` or `ASSERT_TRUE(variable.has_value())`.
#
Checks: >
-*,
abseil-*,
bugprone-*,
google-*,
misc-*,
modernize-*,
performance-*,
portability-*,
readability-*,
-google-readability-braces-around-statements,
-google-readability-namespace-comments,
-google-runtime-references,
-misc-non-private-member-variables-in-classes,
-misc-const-correctness,
-modernize-return-braced-init-list,
-modernize-use-trailing-return-type,
-modernize-avoid-c-arrays,
-performance-move-const-arg,
-readability-braces-around-statements,
-readability-identifier-length,
-readability-magic-numbers,
-readability-named-parameter,
-readability-redundant-declaration,
-readability-function-cognitive-complexity,
-bugprone-narrowing-conversions,
-bugprone-easily-swappable-parameters,
-bugprone-implicit-widening-of-multiplication-result,
-bugprone-unchecked-optional-access
# Turn all the warnings from the checks above into errors.
WarningsAsErrors: "*"
HeaderFilterRegex: "(google/cloud/|generator/).*\\.h$"
CheckOptions:
- { key: readability-identifier-naming.NamespaceCase, value: lower_case }
- { key: readability-identifier-naming.ClassCase, value: CamelCase }
- { key: readability-identifier-naming.StructCase, value: CamelCase }
- { key: readability-identifier-naming.TemplateParameterCase, value: CamelCase }
- { key: readability-identifier-naming.FunctionCase, value: aNy_CasE }
- { key: readability-identifier-naming.VariableCase, value: lower_case }
- { key: readability-identifier-naming.ClassMemberCase, value: lower_case }
- { key: readability-identifier-naming.ClassMemberSuffix, value: _ }
- { key: readability-identifier-naming.PrivateMemberSuffix, value: _ }
- { key: readability-identifier-naming.ProtectedMemberSuffix, value: _ }
- { key: readability-identifier-naming.EnumConstantCase, value: CamelCase }
- { key: readability-identifier-naming.EnumConstantPrefix, value: k }
- { key: readability-identifier-naming.ConstexprVariableCase, value: CamelCase }
- { key: readability-identifier-naming.ConstexprVariablePrefix, value: k }
- { key: readability-identifier-naming.GlobalConstantCase, value: CamelCase }
- { key: readability-identifier-naming.GlobalConstantPrefix, value: k }
- { key: readability-identifier-naming.MemberConstantCase, value: CamelCase }
- { key: readability-identifier-naming.MemberConstantPrefix, value: k }
- { key: readability-identifier-naming.StaticConstantCase, value: CamelCase }
- { key: readability-identifier-naming.StaticConstantPrefix, value: k }
- { key: readability-implicit-bool-conversion.AllowIntegerConditions, value: 1 }
- { key: readability-implicit-bool-conversion.AllowPointerConditions, value: 1 }
- { key: readability-function-cognitive-complexity.IgnoreMacros, value: 1 }