[PATCH] D145895: [ADT] Implement {DenseMap,MapVector,StringMap}::contains

[Kazu Hirata via Phabricator via llvm-commits]

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This patch implements the C++20-style contains() for DenseMap,
MapVector, and StringMap.

With this patch, every set and map container type that has count()
also has contains().


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D145895

Files:
  llvm/include/llvm/ADT/DenseMap.h
  llvm/include/llvm/ADT/MapVector.h
  llvm/include/llvm/ADT/StringMap.h
  llvm/unittests/ADT/DenseMapTest.cpp
  llvm/unittests/ADT/MapVectorTest.cpp
  llvm/unittests/ADT/StringMapTest.cpp

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