[PATCH] D151952: [clang] adds `__type_pack_index` so we can get a type's parameter pack index

[Christopher Di Bella via Phabricator via cfe-commits]

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Similarly to `__type_pack_element`, C++ doesn't offer a way to extract a
the index of the first occurrence of a type in a parameter pack. This
means that we need to build up context for something that the compiler
already has, and then compute the value in a much less efficient manner
than the  compiler.

Clang can compute this information without needing to use extra
resources.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D151952

Files:
  clang/docs/LanguageExtensions.rst
  clang/include/clang/AST/ExprCXX.h
  clang/include/clang/AST/Stmt.h
  clang/include/clang/Basic/DiagnosticSemaKinds.td
  clang/include/clang/Basic/TokenKinds.def
  clang/lib/AST/ASTImporter.cpp
  clang/lib/AST/ExprCXX.cpp
  clang/lib/Parse/ParseDeclCXX.cpp
  clang/lib/Parse/ParseExpr.cpp
  clang/lib/Sema/SemaExprCXX.cpp
  clang/test/SemaCXX/type_pack_index.cpp

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