[libcxx-commits] [libcxx] [libc++] Speed up classic locale (PR #72112)

[Mark de Wever via libcxx-commits]

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@@ -154,12 +155,16 @@ class _LIBCPP_HIDDEN locale::__imp
         {return static_cast<size_t>(id) < facets_.size() && facets_[static_cast<size_t>(id)];}
     const locale::facet* use_facet(long id) const;
 
+    void acquire();
+    void release();
+
     static const locale& make_classic();
     static       locale& make_global();
 private:
     void install(facet* f, long id);
     template <class F> void install(F* f) {install(f, f->id.__get());}
     template <class F> void install_from(const __imp& other);
+    static std::atomic<__imp*> classic_;
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mordante wrote:

Please add documentation for this variable. The patch has a nice description, but when looking at this code in the future it's not easily visible.

https://github.com/llvm/llvm-project/pull/72112