[PATCH] D62027: Convert PointerUnion to a variadic template.

[Richard Smith - zygoloid via Phabricator via llvm-commits]

rsmith created this revision.
rsmith added a reviewer: dblaikie.
Herald added subscribers: llvm-commits, kristina, dexonsmith.
Herald added a project: LLVM.

Rather than duplicating code between PointerUnion, PointerUnion3, and
PointerUnion4 (and missing things from the latter cases, such as some of the
DenseMap support and operator==), convert PointerUnion to a variadic template
that can be used as a union of any number of pointers.

(This doesn't support PointerUnion<> right now. Adding a special case for that
would be possible, and perhaps even useful in some situations, but it doesn't
seem worthwhile until we have a concrete use case.)


Repository:
  rL LLVM

https://reviews.llvm.org/D62027

Files:
  include/llvm/ADT/PointerUnion.h
  unittests/ADT/PointerUnionTest.cpp

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