[libcxx-commits] [libcxx] [libc++] Implement `std::function_ref` (PR #186692)

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``````````diff
--- generate_feature_test_macro_components.py	2026-04-18 12:43:57.000000 +0000
+++ generate_feature_test_macro_components.py	2026-04-18 12:45:23.793555 +0000
@@ -696,11 +696,11 @@
             "libcxx_guard": "_LIBCPP_HAS_FILESYSTEM && _LIBCPP_HAS_LOCALIZATION",
         },
         {
             "name": "__cpp_lib_function_ref",
             "values": {
-                "c++26": 202603 # P3948R1 constant_wrapper is the only tool needed for passing constant expressions via function arguments
+                "c++26": 202603  # P3948R1 constant_wrapper is the only tool needed for passing constant expressions via function arguments
             },
             "headers": ["functional"],
         },
         {
             "name": "__cpp_lib_gcd_lcm",

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https://github.com/llvm/llvm-project/pull/186692