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diff --git a/tiger-compiler/src/parse/metavar-map.hh b/tiger-compiler/src/parse/metavar-map.hh
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+++ b/tiger-compiler/src/parse/metavar-map.hh
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+/**
+ ** \file parse/metavar-map.hh
+ ** \brief Declaration of parse::MetavarMap.
+ */
+
+#pragma once
+
+#include <string>
+
+#include <misc/map.hh>
+
+namespace parse
+{
+  /// A generic map of metavariables.
+  template <typename Data> class MetavarMap
+  {
+  public:
+    /// Build a map of metavariables of kind \a name.
+    MetavarMap(const std::string& name);
+    virtual ~MetavarMap();
+
+    /// Generate a (concrete syntax) Tiger statement for metavariable
+    /// number \a key (of kind \p Data).
+    std::string show(unsigned key) const;
+
+    /// Print the MetavarMap on \a ostr.
+    std::ostream& dump(std::ostream& ostr) const;
+
+  protected:
+    /// Append a metavariable to the map.
+    virtual std::string append_(unsigned& key, Data* data);
+    /// Extract a metavariable.
+    virtual Data* take_(unsigned key);
+
+    /// Name of the kind of variable.
+    const std::string name_;
+    /// Metavariables.
+    using map_type = misc::map<unsigned, Data*>;
+    map_type map_;
+  };
+
+  /// Output \a m onto \a ostr.
+  template <typename Data>
+  std::ostream& operator<<(std::ostream& ostr, const MetavarMap<Data>& m);
+
+} // namespace parse
+
+#include <parse/metavar-map.hxx>