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diff --git a/tiger-compiler/lib/misc/endomap.hxx b/tiger-compiler/lib/misc/endomap.hxx
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+++ b/tiger-compiler/lib/misc/endomap.hxx
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+/**                                                     -*- C++ -*-
+ ** \file misc/endomap.hxx
+ ** \brief Implementation of misc::endomap.
+ */
+
+#pragma once
+
+#include <misc/endomap.hh>
+
+namespace misc
+{
+  template <class T>
+  endomap<T>::endomap()
+    : map<T, T>()
+    , strictness_(strictness_type::nonstrict)
+  {}
+
+  template <class T> endomap<T>* endomap<T>::clone() const
+  {
+    return new endomap<T>(*this);
+  }
+
+  template <class T> T endomap<T>::operator()(const T& t) const
+  {
+    if (const auto&& ires = this->find(t); ires != this->map_.end())
+      return ires->second;
+    else if (this->strictness_ == strictness_type::nonstrict)
+      return t;
+    std::ostringstream err;
+    err << "map: no mapping for " << t;
+    throw std::range_error(err.str());
+  }
+
+  template <class T> T& endomap<T>::operator[](const T& t)
+  {
+    // Inspired by ``Efficient STL'' on efficient insert_or_update
+    // for maps.  See also misc::put.
+    auto i = this->map_.lower_bound(t);
+    if (i == this->map_.end() || this->map_.key_comp()(t, i->first))
+      i = this->map_.emplace(t, t).first;
+    return i->second;
+  }
+
+} // namespace misc