Update .clang-tidy, add .clang-format.

.clang-format

@@ -0,0 +1,131 @@
+# -*- mode: yaml -*-
+# Written for clang-format 10.
+# https://releases.llvm.org/10.0.0/tools/clang/docs/ClangFormatStyleOptions.html
+---
+DisableFormat: false
+Language: Cpp
+
+AccessModifierOffset: -4
+AlignAfterOpenBracket: Align
+AlignConsecutiveAssignments: false
+# AlignConsecutiveBitFields: false # clang-format 11
+AlignConsecutiveDeclarations: false
+AlignConsecutiveMacros: false
+AlignEscapedNewlines: DontAlign
+AlignOperands: true             # clang-format 11: Align
+AlignTrailingComments: true
+AllowAllArgumentsOnNextLine: false
+AllowAllConstructorInitializersOnNextLine: false
+AllowAllParametersOfDeclarationOnNextLine: false
+AllowShortBlocksOnASingleLine: Empty
+AllowShortCaseLabelsOnASingleLine: false
+# AllowShortEnumsOnASingleLine: false # clang-format 11
+AllowShortFunctionsOnASingleLine: Empty
+AllowShortIfStatementsOnASingleLine: Never
+AllowShortLambdasOnASingleLine: Inline
+AllowShortLoopsOnASingleLine: false
+AlwaysBreakAfterReturnType: None
+AlwaysBreakBeforeMultilineStrings: false
+AlwaysBreakTemplateDeclarations: Yes
+BinPackArguments: true
+BinPackParameters: true
+BraceWrapping:                  # If BreakBeforeBraces is set to Custom.
+  AfterCaseLabel: true
+  AfterClass: true
+  AfterControlStatement: Always
+  AfterEnum: true
+  AfterFunction: true
+  AfterNamespace: true
+  AfterStruct: true
+  AfterUnion: true
+  AfterExternBlock: true
+  BeforeCatch: true
+  BeforeElse: true
+  # BeforeLambdaBody: true        # clang-format 11
+  # BeforeWhile: true             # clang-format 11
+  IndentBraces: false
+  SplitEmptyFunction: false
+  SplitEmptyRecord: false
+  SplitEmptyNamespace: false
+BreakBeforeBinaryOperators: NonAssignment
+BreakBeforeBraces: Custom
+BreakBeforeTernaryOperators: true
+BreakConstructorInitializers: BeforeComma
+BreakInheritanceList: BeforeComma
+BreakStringLiterals: true
+ColumnLimit: 80
+# CommentPragmas: 'regex'
+CompactNamespaces: false
+ConstructorInitializerAllOnOneLineOrOnePerLine: false
+ConstructorInitializerIndentWidth: 4
+ContinuationIndentWidth: 4
+Cpp11BracedListStyle: true
+DeriveLineEnding: true
+DerivePointerAlignment: false
+FixNamespaceComments: true
+ForEachMacros:
+  - FOREACH
+  - RANGES_FOR
+  - Q_FOREACH
+  - BOOST_FOREACH
+IncludeBlocks: Regroup
+IncludeCategories:              # stdlib headers into own group.
+  - Regex: '^[^\.]+$'
+    Priority: 4
+# IndentCaseBlocks: false         # clang-format 11
+IndentCaseLabels: false
+# IndentExternBlock: NoIndent     # clang-format 11
+IndentGotoLabels: false
+IndentPPDirectives: AfterHash
+IndentWidth: 4
+IndentWrappedFunctionNames: false
+KeepEmptyLinesAtTheStartOfBlocks: true
+# MacroBlockBegin: 'string'
+# MacroBlockEnd:   'string'
+MaxEmptyLinesToKeep: 1
+NamespaceIndentation: None
+# NamespaceMacros: 'string'
+PenaltyBreakAssignment: 250
+PenaltyBreakBeforeFirstCallParameter: 300
+# PenaltyBreakComment: 300
+# PenaltyBreakFirstLessLess: 120
+# PenaltyBreakString: 1000
+# PenaltyBreakTemplateDeclaration: 10
+# PenaltyExcessCharacter: 1000000
+# PenaltyReturnTypeOnItsOwnLine: 60
+PointerAlignment: Right
+# RawStringFormats: # <YAML>
+ReflowComments: true
+SortIncludes: true
+SortUsingDeclarations: true
+SpaceAfterCStyleCast: false
+SpaceAfterLogicalNot: false
+SpaceAfterTemplateKeyword: false
+SpaceBeforeAssignmentOperators: true
+SpaceBeforeCpp11BracedList: false
+SpaceBeforeCtorInitializerColon: true
+SpaceBeforeInheritanceColon: true
+SpaceBeforeParens: ControlStatements
+SpaceBeforeRangeBasedForLoopColon: true
+SpaceBeforeSquareBrackets: false
+SpaceInEmptyBlock: false
+SpaceInEmptyParentheses: false
+SpacesBeforeTrailingComments: 1
+SpacesInAngles: false
+SpacesInCStyleCastParentheses: false
+SpacesInConditionalStatement: false
+SpacesInContainerLiterals: false
+SpacesInParentheses: false
+SpacesInSquareBrackets: false
+Standard: Auto
+# StatementMacros:
+#   - Q_UNUSED
+#   - QT_REQUIRE_VERSION
+TabWidth: 4
+# TypenameMacros:
+#   - STACK_OF
+#   - LIST
+UseCRLF: false
+UseTab: Never
+# WhitespaceSensitiveMacros: ['string', 'string'] # clang-format 11
+...

.clang-tidy

@@ -25,7 +25,8 @@ Checks:         '*,
                 -hicpp-vararg,
                 -fuchsia-statically-constructed-objects,
                 -google-readability-todo,
-                -modernize-use-trailing-return-type'
+                -modernize-use-trailing-return-type,
+                -fuchsia-multiple-inheritance'
 CheckOptions:   - { key: readability-identifier-naming.ClassCase,             value: CamelCase  }
                 # Clashes with constant private member prefix. (const int _var;)
                 # - { key: readability-identifier-naming.ConstantCase,          value: lower_case }