[PATCH] D120900: [clang][dataflow] Add `MatchSwitch` utility library.

[Yitzhak Mandelbaum via Phabricator via cfe-commits]

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Adds `MatchSwitch`, a library for simplifying implementation of transfer
functions. `MatchSwitch` supports constructing a "switch" statement, where each
case of the switch is defined by an AST matcher. The cases are considered in
order, like pattern matching in functional languages.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D120900

Files:
  clang/include/clang/Analysis/FlowSensitive/MatchSwitch.h
  clang/unittests/Analysis/FlowSensitive/CMakeLists.txt
  clang/unittests/Analysis/FlowSensitive/MatchSwitchTest.cpp

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