[clang] [ASTMatchers] Simplify isDefaultedHelper (NFC) (PR #137571)

[Kazu Hirata via cfe-commits]

https://github.com/kazutakahirata created https://github.com/llvm/llvm-project/pull/137571

We can use "constexpt if" to combine the two variants of functions.


>From 1f4e0a2f61f75c45aea2651dff2f08d1a60d4526 Mon Sep 17 00:00:00 2001
From: Kazu Hirata <kazu at google.com>
Date: Sun, 27 Apr 2025 19:44:12 -0700
Subject: [PATCH] [ASTMatchers] Simplify isDefaultedHelper (NFC)

We can use "constexpt if" to combine the two variants of functions.
---
 clang/include/clang/ASTMatchers/ASTMatchersInternal.h | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/clang/include/clang/ASTMatchers/ASTMatchersInternal.h b/clang/include/clang/ASTMatchers/ASTMatchersInternal.h
index 8290645768aa9..00a4fefeac8f8 100644
--- a/clang/include/clang/ASTMatchers/ASTMatchersInternal.h
+++ b/clang/include/clang/ASTMatchers/ASTMatchersInternal.h
@@ -871,14 +871,11 @@ IteratorT matchesFirstInPointerRange(const MatcherT &Matcher, IteratorT Start,
   return End;
 }
 
-template <typename T, std::enable_if_t<!std::is_base_of<FunctionDecl, T>::value>
-                          * = nullptr>
-inline bool isDefaultedHelper(const T *) {
+template <typename T> inline bool isDefaultedHelper(const T *FD) {
+  if constexpr (std::is_base_of<FunctionDecl, T>::value)
+    return FD->isDefaulted();
   return false;
 }
-inline bool isDefaultedHelper(const FunctionDecl *FD) {
-  return FD->isDefaulted();
-}
 
 // Metafunction to determine if type T has a member called getDecl.
 template <typename T>