1 files changed, 47 insertions, 78 deletions
diff --git a/third_party/nix/src/libutil/ref.hh b/third_party/nix/src/libutil/ref.hh
index 0be2a7e74ae0..5f0d7db4b6a1 100644
--- a/third_party/nix/src/libutil/ref.hh
+++ b/third_party/nix/src/libutil/ref.hh
@@ -1,92 +1,61 @@
 #pragma once
 
-#include <memory>
 #include <exception>
+#include <memory>
 #include <stdexcept>
 
 namespace nix {
 
 /* A simple non-nullable reference-counted pointer. Actually a wrapper
    around std::shared_ptr that prevents non-null constructions. */
-template<typename T>
-class ref
-{
-private:
-
-    std::shared_ptr<T> p;
-
-public:
-
-    ref<T>(const ref<T> & r)
-        : p(r.p)
-    { }
-
-    explicit ref<T>(const std::shared_ptr<T> & p)
-        : p(p)
-    {
-        if (!p)
-            throw std::invalid_argument("null pointer cast to ref");
-    }
-
-    explicit ref<T>(T * p)
-        : p(p)
-    {
-        if (!p)
-            throw std::invalid_argument("null pointer cast to ref");
-    }
-
-    T* operator ->() const
-    {
-        return &*p;
-    }
-
-    T& operator *() const
-    {
-        return *p;
-    }
-
-    operator std::shared_ptr<T> () const
-    {
-        return p;
-    }
-
-    std::shared_ptr<T> get_ptr() const
-    {
-        return p;
-    }
-
-    template<typename T2>
-    ref<T2> cast() const
-    {
-        return ref<T2>(std::dynamic_pointer_cast<T2>(p));
-    }
-
-    template<typename T2>
-    std::shared_ptr<T2> dynamic_pointer_cast() const
-    {
-        return std::dynamic_pointer_cast<T2>(p);
-    }
-
-    template<typename T2>
-    operator ref<T2> () const
-    {
-        return ref<T2>((std::shared_ptr<T2>) p);
-    }
-
-private:
-
-    template<typename T2, typename... Args>
-    friend ref<T2>
-    make_ref(Args&&... args);
+template <typename T>
+class ref {
+ private:
+  std::shared_ptr<T> p;
+
+ public:
+  ref<T>(const ref<T>& r) : p(r.p) {}
+
+  explicit ref<T>(const std::shared_ptr<T>& p) : p(p) {
+    if (!p) throw std::invalid_argument("null pointer cast to ref");
+  }
+
+  explicit ref<T>(T* p) : p(p) {
+    if (!p) throw std::invalid_argument("null pointer cast to ref");
+  }
+
+  T* operator->() const { return &*p; }
+
+  T& operator*() const { return *p; }
 
+  operator std::shared_ptr<T>() const { return p; }
+
+  std::shared_ptr<T> get_ptr() const { return p; }
+
+  template <typename T2>
+  ref<T2> cast() const {
+    return ref<T2>(std::dynamic_pointer_cast<T2>(p));
+  }
+
+  template <typename T2>
+  std::shared_ptr<T2> dynamic_pointer_cast() const {
+    return std::dynamic_pointer_cast<T2>(p);
+  }
+
+  template <typename T2>
+  operator ref<T2>() const {
+    return ref<T2>((std::shared_ptr<T2>)p);
+  }
+
+ private:
+  template <typename T2, typename... Args>
+  friend ref<T2> make_ref(Args&&... args);
 };
 
-template<typename T, typename... Args>
-inline ref<T>
-make_ref(Args&&... args)
-{
-    auto p = std::make_shared<T>(std::forward<Args>(args)...);
-    return ref<T>(p);
+template <typename T, typename... Args>
+inline ref<T> make_ref(Args&&... args) {
+  auto p = std::make_shared<T>(std::forward<Args>(args)...);
+  return ref<T>(p);
 }
 
-}
+}  // namespace nix