[PATCH] D125599: Introduce TypeNameTraits for llvm::getTypeName()

[Logan Chien via Phabricator via llvm-commits]

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This commit introduces `TypeNameTraits` as a customization point for
`llvm::getTypeName<T>()`.

Before this commit, developers can specialize `llvm::getTypeName<T>()`
function template to customize the behavior. However, C++ programming
language doesn't allow function template partial specialization.

After this commit, if someone wants to partial specialize
`getTypeName()` for a class template, they can define:

  namespace llvm {
  
  template <typename T>
  class TypeNameTraits<SomeContainer<T>> {
  public:
    static llvm::StringRef getTypeName() {
      // ... a different implementation ...
    }
  };
  
  }  // namespace llvm

And then, calling `llvm::getTypeName<SomeContainer<int>>()` will be
dispatched to the partial specialized version.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D125599

Files:
  llvm/include/llvm/Support/TypeName.h
  llvm/unittests/Support/TypeNameTest.cpp

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