Add .clang-tidy

.clang-tidy

@@ -0,0 +1,72 @@
+---
+# abseil-*, altera-*, android-*, fuchsia-*, hicpp-*, llvmlibc-*, zircon-*: Applicable to specific code bases only, not this one.
+# objc-*: Not an Objective C codebase
+# cppcoreguidelines-owning-memory: We don't want to use gsl.
+# cppcoreguidelines-pro-type-vararg triggers on all char* which we can't avoid
+# google-runtime-references: Triggers incorrectly
+# llvm-header-guard: is not the style we use
+# misc-no-recursion: We do not mind recursion (and we need to recurse)
+# readability-function-cognitive-complexity: Too many asserts trigger this one unnecessarily
+# cppcoreguidelines-pro-bounds-array-to-pointer-decay: Triggers on assert()
+Checks:          >-
+ *,
+ -abseil-*,
+ -altera-*,
+ -android-*,
+ -fuchsia-*,
+ -hicpp-*,
+ -llvmlibc-*,
+ -objc-*,
+ -zircon-*,
+ -cppcoreguidelines-owning-memory,
+ -cppcoreguidelines-pro-type-vararg,
+ -google-runtime-references,
+ -llvm-header-guard,
+ -misc-no-recursion,
+ -readability-function-cognitive-complexity,
+ -clang-diagnostic-ignored-optimization-argument,
+ -cppcoreguidelines-pro-bounds-array-to-pointer-decay
+WarningsAsErrors: '*,-clang-diagnostic-ignored-optimization-argument'
+HeaderFilterRegex: ''
+AnalyzeTemporaryDtors: false
+FormatStyle:     file
+User:            mgrettondann
+CheckOptions:
+  - key:             llvm-else-after-return.WarnOnConditionVariables
+    value:           '0'
+  - key:             modernize-loop-convert.MinConfidence
+    value:           reasonable
+  - key:             modernize-replace-auto-ptr.IncludeStyle
+    value:           llvm
+  - key:             cert-str34-c.DiagnoseSignedUnsignedCharComparisons
+    value:           '0'
+  - key:             google-readability-namespace-comments.ShortNamespaceLines
+    value:           '10'
+  - key:             cert-oop54-cpp.WarnOnlyIfThisHasSuspiciousField
+    value:           '0'
+  - key:             cppcoreguidelines-non-private-member-variables-in-classes.IgnoreClassesWithAllMemberVariablesBeingPublic
+    value:           '1'
+  - key:             cert-dcl16-c.NewSuffixes
+    value:           'L;LL;LU;LLU'
+  - key:             google-readability-braces-around-statements.ShortStatementLines
+    value:           '1'
+  - key:             modernize-pass-by-value.IncludeStyle
+    value:           llvm
+  - key:             google-readability-namespace-comments.SpacesBeforeComments
+    value:           '2'
+  - key:             modernize-loop-convert.MaxCopySize
+    value:           '16'
+  - key:             cppcoreguidelines-explicit-virtual-functions.IgnoreDestructors
+    value:           '1'
+  - key:             modernize-use-nullptr.NullMacros
+    value:           'NULL'
+  - key:             llvm-qualified-auto.AddConstToQualified
+    value:           '0'
+  - key:             modernize-loop-convert.NamingStyle
+    value:           CamelCase
+  - key:             llvm-else-after-return.WarnOnUnfixable
+    value:           '0'
+  - key:             google-readability-function-size.StatementThreshold
+    value:           '800'
+...
+