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diff --git a/tiger-compiler/lib/misc/ref.hxx b/tiger-compiler/lib/misc/ref.hxx
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+++ b/tiger-compiler/lib/misc/ref.hxx
@@ -0,0 +1,71 @@
+/**
+ ** \file misc/ref.hxx
+ ** \brief Implementation of misc::ref.
+ **/
+
+#pragma once
+
+#include <typeinfo>
+
+#include <misc/ref.hh>
+
+namespace misc
+{
+  /*-----------------.
+  | Ctors and dtor.  |
+  `-----------------*/
+
+  template <typename T>
+  template <typename U>
+  ref<T>::ref(const ref<U>& other)
+    : super_type(other)
+  {}
+
+  template <typename T>
+  ref<T>::ref(const ref<T>& other)
+    : super_type(other)
+  {}
+
+  template <typename T>
+  ref<T>::ref(T* p)
+    : super_type(p)
+  {}
+
+  /*---------------------.
+  | Equality operators.  |
+  `---------------------*/
+
+  template <typename T> bool ref<T>::operator==(const T* other) const
+  {
+    return this->get() == other;
+  }
+
+  template <typename T> bool ref<T>::operator!=(const T* other) const
+  {
+    return !(*this == other);
+  }
+
+  /*--------.
+  | Casts.  |
+  `--------*/
+
+  template <typename T> template <typename U> ref<U> ref<T>::unsafe_cast() const
+  {
+    ref<U> res;
+    (std::dynamic_pointer_cast<U, element_type>(*this)).swap(res);
+    return res;
+  }
+
+  template <typename T> template <typename U> ref<U> ref<T>::cast() const
+  {
+    if (!this->get() || !this->is_a<U>())
+      throw std::bad_cast();
+    return unsafe_cast<U>();
+  }
+
+  template <typename T> template <typename U> bool ref<T>::is_a() const
+  {
+    return dynamic_cast<U*>(this->get());
+  }
+
+} // namespace misc