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diff --git a/tiger-compiler/lib/misc/select-const.hh b/tiger-compiler/lib/misc/select-const.hh
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+++ b/tiger-compiler/lib/misc/select-const.hh
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+/**
+ ** \file misc/select-const.hh
+ ** \brief Select between a non const or a const type.
+ */
+
+#pragma once
+
+namespace misc
+{
+  /*------------------.
+  | const selectors.  |
+  `------------------*/
+
+  /// Return \a T constified.
+  template <typename T> struct constify_traits
+  {
+    using type = const T;
+  };
+
+  /// Return \a T as is.
+  template <typename T> struct id_traits
+  {
+    using type = T;
+  };
+
+  /*------------------.
+  | select_iterator.  |
+  `------------------*/
+
+  /// The iterator over a non const structure is plain iterator.
+  template <typename T> struct select_iterator
+  {
+    using type = typename T::iterator;
+  };
+
+  /// The iterator over a const structure is a const_iterator.
+  template <typename T> struct select_iterator<const T>
+  {
+    using type = typename T::const_iterator;
+  };
+
+} //namespace misc