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diff --git a/tiger-compiler/lib/misc/algorithm.hh b/tiger-compiler/lib/misc/algorithm.hh
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+/**
+ ** \file misc/algorithm.hh
+ ** \brief Some syntactic sugar to look for things in STL containers.
+ */
+
+#pragma once
+
+#include <iosfwd>
+#include <misc/concepts.hh>
+
+namespace misc
+{
+  /// Invoke delete on all the members of \a c, and clear it.
+  template <typename Container>
+    requires Iterable<Container>
+  void deep_clear(Container& c);
+
+  /// Find \a v in the whole \a c.
+  template <typename Container>
+    requires ConstIterable<Container>
+  inline typename Container::const_iterator
+  find(const Container& c, const typename Container::value_type& v);
+
+  /// Find \a v in the whole \a c.
+  template <typename Container>
+    requires Iterable<Container>
+  inline typename Container::iterator
+  find(Container& c, const typename Container::value_type& v);
+
+  /// Apply \a f to all the members of \a c, and return it.
+  template <typename Container, typename Functor>
+    requires ConstIterable<Container>
+  inline Functor& for_each(Container& c, Functor& v);
+
+  /// Is \a v member of \a c?
+  template <typename Container>
+    requires ConstIterable<Container>
+  inline bool has(const Container& c, const typename Container::value_type& v);
+
+  /// Insert or update \a key -> \a value in \a map, return iterator to it.
+  template <Map Map>
+  typename Map::iterator put(Map& map,
+                             const typename Map::key_type& key,
+                             const typename Map::mapped_type& value);
+
+} // namespace misc
+
+#include <misc/algorithm.hxx>