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Jon Ross-Perkins
cb4686bf21
Pursuant to discussion regarding #4699, turn on `misc-non-private-member-variables-in-classes` using the `IgnoreClassesWithAllMemberVariablesBeingPublic` flag (the check treats structs as classes, so we need this for structs with all-public members). Updates the style guide notes to match, which should be pretty minor due to the scoping of test fixtures. Also fixes some underscore uses in test files on the way. Basically this is keeping the style for [class data member naming](https://google.github.io/styleguide/cppguide.html#Variable_Names) even while making them public.
C++ migration tooling
Table of contents
Overview
migrate_cpp assists in migration of C++ code to Carbon. It's currently being
assembled; more documentation will be added later.
Structure
The migrate_cpp tool uses a clang::RecursiveASTVisitor to traverse Clang's
AST and, to each node, associate replacements. Each node's replacement is a
sequence of text, or a reference to some other node that should be used to
replace it.