https://github.com/kparzysz created
https://github.com/llvm/llvm-project/pull/146390
A basic implementation until we get it in `std` in C++20.
>From 7c294619f38984e26264d25524f6f5e79397f297 Mon Sep 17 00:00:00 2001
From: Krzysztof Parzyszek <krzysztof.parzys...@amd.com>
Date: Mon, 30 Jun 2025 11:45:43 -0500
Subject: [PATCH] [STLForwardCompat] Implement llvm::type_identity, NFC
---
.../include/clang/Tooling/Transformer/Transformer.h | 13 ++++---------
llvm/include/llvm/ADT/STLForwardCompat.h | 10 ++++++++++
2 files changed, 14 insertions(+), 9 deletions(-)
diff --git a/clang/include/clang/Tooling/Transformer/Transformer.h
b/clang/include/clang/Tooling/Transformer/Transformer.h
index 71b1fe81b9518..ecf7c0912d2d8 100644
--- a/clang/include/clang/Tooling/Transformer/Transformer.h
+++ b/clang/include/clang/Tooling/Transformer/Transformer.h
@@ -42,11 +42,6 @@ class TransformerImpl {
virtual void
onMatchImpl(const ast_matchers::MatchFinder::MatchResult &Result) = 0;
};
-
-// FIXME: Use std::type_identity or backport when available.
-template <class T> struct type_identity {
- using type = T;
-};
} // namespace detail
template <typename T> struct TransformerResult {
@@ -95,8 +90,8 @@ class Transformer : public
ast_matchers::MatchFinder::MatchCallback {
template <typename MetadataT>
explicit Transformer(
transformer::RewriteRuleWith<MetadataT> Rule,
- std::function<void(llvm::Expected<TransformerResult<
- typename
detail::type_identity<MetadataT>::type>>)>
+ std::function<void(
+ llvm::Expected<TransformerResult<llvm::type_identity_t<MetadataT>>>)>
Consumer);
/// N.B. Passes `this` pointer to `MatchFinder`. So, this object should not
@@ -200,8 +195,8 @@ template <typename T> class WithMetadataImpl final : public
TransformerImpl {
template <typename MetadataT>
Transformer::Transformer(
transformer::RewriteRuleWith<MetadataT> Rule,
- std::function<void(llvm::Expected<TransformerResult<
- typename detail::type_identity<MetadataT>::type>>)>
+ std::function<void(
+ llvm::Expected<TransformerResult<llvm::type_identity_t<MetadataT>>>)>
Consumer)
: Impl(std::make_unique<detail::WithMetadataImpl<MetadataT>>(
std::move(Rule), std::move(Consumer))) {}
diff --git a/llvm/include/llvm/ADT/STLForwardCompat.h
b/llvm/include/llvm/ADT/STLForwardCompat.h
index 75a0d4acf67f1..370caf5a897b5 100644
--- a/llvm/include/llvm/ADT/STLForwardCompat.h
+++ b/llvm/include/llvm/ADT/STLForwardCompat.h
@@ -36,6 +36,16 @@ template <typename T>
using remove_cvref_t // NOLINT(readability-identifier-naming)
= typename llvm::remove_cvref<T>::type;
+template <typename T>
+struct type_identity // NOLINT(readability-identifier-naming)
+{
+ using type = T;
+};
+
+template <typename T>
+using type_identity_t // NOLINT(readability-identifier-naming)
+ = typename llvm::type_identity<T>::type;
+
//===----------------------------------------------------------------------===//
// Features from C++23
//===----------------------------------------------------------------------===//
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