[PATCH] D65196: [CFG] Introduce CFGElementRef, a wrapper that knows it's position in a CFGBlock

[Kristóf Umann via Phabricator via cfe-commits]

Szelethus created this revision.
Szelethus added reviewers: NoQ, xazax.hun, baloghadamsoftware, Charusso, dcoughlin, rnkovacs, a_sidorin.
Szelethus added a project: clang.
Herald added subscribers: cfe-commits, gamesh411, dkrupp.

Previously, collecting `CFGElement`s in a set was practially impossible, because both `CFGBlock::operator[]` and both the iterators returned it by value. One workaround would be to collect the iterators instead, but they don't really capture the concept of an element, and elements from different iterator types are incomparable.

This patch introduces `CFGElementRef`, a wrapper around a `(CFGBlock, Index)` pair, and a variety of new iterators and iterator ranges  to solve this problem.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D65196

Files:
  clang/include/clang/Analysis/CFG.h
  clang/lib/Analysis/CFG.cpp
  clang/unittests/Analysis/CFGTest.cpp

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