Initial submit.

.bazelrc

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+# To debug bazel options, uncomment next line.
+# build --announce_rc
+
+# Define the Apple OS
+build --apple_platform_type=macos
+
+# Allow platform specific control and add the missing 'CoreFoundation' lib.
+build --enable_platform_specific_config
+build:macos --features=-supports_dynamic_linker --linkopt=-framework --linkopt=CoreFoundation --host_linkopt=-framework --host_linkopt=CoreFoundation --linkopt=-Wl,-undefined,error
+
+build --cxxopt=-std=c++20 --host_cxxopt=-std=c++20 --cxxopt=-Werror
+test --test_output=errors

.clang-format

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+BasedOnStyle: Google
+
+# Function argument formatting: Avoid reformatting:
+# If parameters do not fit on the same line, then use one line per parameter
+# with the same indent (not aligned with the parantesis).
+
+ColumnLimit: 120
+
+AlignAfterOpenBracket: AlwaysBreak
+AllowAllParametersOfDeclarationOnNextLine: false
+AllowShortBlocksOnASingleLine: Empty
+AllowShortCaseLabelsOnASingleLine: true
+AllowShortEnumsOnASingleLine: true
+AllowShortFunctionsOnASingleLine: Inline
+AllowShortIfStatementsOnASingleLine: Never
+AllowShortLambdasOnASingleLine: All
+AllowShortLoopsOnASingleLine: false
+AlwaysBreakTemplateDeclarations: Yes
+BinPackParameters: false
+BreakBeforeBinaryOperators: NonAssignment
+BreakBeforeConceptDeclarations: Always
+BreakBeforeTernaryOperators: true
+BreakInheritanceList: BeforeComma
+EmptyLineBeforeAccessModifier: Always
+FixNamespaceComments: true
+IndentRequiresClause: false
+InsertBraces: true
+InsertNewlineAtEOF: true
+# InsertTrailingCommas: true <- Would change structs to never bin pack
+IntegerLiteralSeparator:
+  Binary: 0
+  Decimal: 3
+KeepEmptyLinesAtTheStartOfBlocks: false
+MaxEmptyLinesToKeep: 1
+PackConstructorInitializers: NextLine
+PointerAlignment: Left
+QualifierAlignment: Left
+ReferenceAlignment: Left
+RemoveSemicolon: true
+RequiresClausePosition: OwnLine
+RequiresExpressionIndentation: OuterScope
+SeparateDefinitionBlocks: Always
+SortUsingDeclarations: Lexicographic
+SpaceAfterTemplateKeyword: false
+SpaceAroundPointerQualifiers: After
+Standard: c++20

.clang-tidy

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+---
+Checks: >
+  *,
+  abseil-*,
+  -altera-*,
+  bugprone-*,
+  -bugprone-exception-escape,
+  -cert-err58-cpp,
+  clang*,
+  clang-analyzer-*,
+  clang-diagnostic-*,
+  -clang-diagnostic-unused-command-line-argument,
+  cppcoreguidelines-*,
+  -cppcoreguidelines-avoid-const-or-ref-data-members,
+  -fuchsia*,
+  google-*,
+  -hicpp-no-assembler,
+  -llvm-else-after-return,
+  llvm-header-guard,
+  -llvm-include-order,
+  -llvmlibc-*,
+  misc-*,
+  modernize-*,
+  -modernize-use-nodiscard,
+  -modernize-use-trailing-return-type,
+  performance-*,
+  portability-*,
+  readability-*,
+  -readability-else-after-return,
+
+WarningsAsErrors: true
+#HeaderFilterRegex: 'mbo/.*'
+AnalyzeTemporaryDtors: false
+FormatStyle:       '.clang-format'
+CheckOptions:
+  - key:             bugprone-signed-char-misuse.CharTypdefsToIgnore
+    value:           'int8_t'
+  - key:             google-readability-braces-around-statements.ShortStatementLines
+    value:           '1'
+  - key:             google-readability-function-size.StatementThreshold
+    value:           '800'
+  - key:             google-readability-namespace-comments.ShortNamespaceLines
+    value:           '15'
+  - key:             google-readability-namespace-comments.SpacesBeforeComments
+    value:           '2'
+  - key:             misc-non-private-member-variables-in-classes.IgnoreClassesWithAllMemberVariablesBeingPublic
+    value:           '1'
+  - key:             modernize-loop-convert.MaxCopySize
+    value:           '16'
+  - key:             modernize-loop-convert.MinConfidence
+    value:           reasonable
+  - key:             modernize-loop-convert.NamingStyle
+    value:           CamelCase
+  - key:             modernize-pass-by-value.IncludeStyle
+    value:           llvm
+  - key:             modernize-replace-auto-ptr.IncludeStyle
+    value:           llvm
+  - key:             modernize-use-default-member-init.UseAssignment
+    value:           '1'
+  - key:             modernize-use-emplace.IgnoreImplicitConstructors
+    value:           '1'
+  - key:             modernize-use-nullptr.NullMacros
+    value:           'NULL'
+  - key:             performance-unnecessary-value-param.AllowedTypes
+    value:           'absl::Status;absl::StatusOr;std::string_view'
+  - key:             readability-braces-around-statements.ShortStatementLines
+    value:           '1'
+  - key:             readability-identifier-length.IgnoredLoopCounterNames
+    value:           'i|it|n'
+  - key:             readability-identifier-length.IgnoredParameterNames
+    value:           'os|v'
+  - key:             readability-identifier-length.IgnoredVariableNames
+    value:           'os|v|it'
+  - key:             cppcoreguidelines-non-private-member-variables-in-classes.IgnoreClassesWithAllMemberVariablesBeingPublic
+    value:           '1'
+  - key:             readability-identifier-naming.ClassCase
+    value:           CamelCase
+  - key:             readability-identifier-naming.ClassMemberCase
+    value:           lower_case
+  - key:             readability-identifier-naming.ConstexprVariableCase
+    value:           CamelCase
+  - key:             readability-identifier-naming.ConstexprVariablePrefix
+    value:           k
+  - key:             readability-identifier-naming.EnumCase
+    value:           CamelCase
+  - key:             readability-identifier-naming.EnumConstantCase
+    value:           CamelCase
+  - key:             readability-identifier-naming.EnumConstantPrefix
+    value:           k
+  - key:             readability-identifier-naming.FunctionCase
+    value:           CamelCase
+  - key:             readability-identifier-naming.GlobalConstantCase
+    value:           CamelCase
+  - key:             readability-identifier-naming.GlobalConstantPrefix
+    value:           k
+  - key:             readability-identifier-naming.StaticConstantCase
+    value:           CamelCase
+  - key:             readability-identifier-naming.StaticConstantPrefix
+    value:           k
+  - key:             readability-identifier-naming.StaticVariableCase
+    value:           lower_case
+  - key:             readability-identifier-naming.MacroDefinitionCase
+    value:           UPPER_CASE
+  - key:             readability-identifier-naming.MacroDefinitionIgnoredRegexp
+    value:           '^[A-Z]+(_[A-Z]+)*_$'
+  - key:             readability-identifier-naming.MemberCase
+    value:           lower_case
+  - key:             readability-identifier-naming.PrivateMemberSuffix
+    value:           _
+  - key:             readability-identifier-naming.PublicMemberSuffix
+    value:           ''
+  - key:             readability-identifier-naming.NamespaceCase
+    value:           lower_case
+  - key:             readability-identifier-naming.ParameterCase
+    value:           lower_case
+  - key:             readability-identifier-naming.TypeAliasCase
+    value:           CamelCase
+  - key:             readability-identifier-naming.TypedefCase
+    value:           CamelCase
+  - key:             readability-identifier-naming.VariableCase
+    value:           lower_case
+  - key:             readability-identifier-naming.IgnoreMainLikeFunctions
+    value:           1
+  - key:             readability-identifier-naming.TypeAliasIgnoredRegexp
+    value:           'type'
+  - key:             readability-identifier-naming.ClassIgnoredRegexp
+    value:           'type'
+  - key:             readability-identifier-naming.ConstexprVariableIgnoredRegexp
+    value:           'value|index|.*[a-z]V'
+  - key:             llvm-header-guard.HeaderFileExtensions
+    value:           'h,hh,hpp,hxx'
+...

.clangd

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+CompileFlags:
+    #Compiler: /Library/Developer/CommandLineTools/usr/bin/clang
+    Compiler: /usr/local/opt/llvm/clang
+
+Diagnostics:
+    UnusedIncludes: Strict

.gitignore

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+/__pycache__
+
+# Ignore the `external` link (that is added by `bazel-compile-commands-extractor`). The link differs between macOS/Linux and Windows, so it shouldn't be checked in. The pattern must not end with a trailing `/` because it's a symlink on macOS/Linux.
+/external
+# Ignore links to Bazel's output. The pattern needs the `*` because people can change the name of the directory into which your repository is cloned (changing the `bazel-<workspace_name>` symlink), and must not end with a trailing `/` because it's a symlink on macOS/Linux.
+/bazel-*
+# Ignore generated output. Although valuable (after all, the primary purpose of `bazel-compile-commands-extractor` is to produce `compile_commands.json`!), it should not be checked in.
+/compile_commands.json
+# Ignore the directory in which `clangd` stores its local index.
+/.cache/

BUILD.bazel

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+package(default_visibility = ["//visibility:private"])