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+// Copyright (C) 2013, Gabriel Dos Reis.
+// All rights reserved.
+// Written by Gabriel Dos Reis.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     - Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//
+//     - Redistributions in binary form must reproduce the above copyright
+//       notice, this list of conditions and the following disclaimer in
+//       the documentation and/or other materials provided with the
+//       distribution.
+//
+//     - Neither the name of OpenAxiom. nor the names of its contributors
+//       may be used to endorse or promote products derived from this
+//       software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+// IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+// TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+// PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
+// OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef OPENAXIOM_CONSTRUCTOR_included
+#define OPENAXIOM_CONSTRUCTOR_included
+
+#include <open-axiom/string-pool>
+
+namespace OpenAxiom {
+   namespace VM {
+      // -- identifier
+      using Identifier = String;
+
+      // -- A constructor kind.
+      enum class ConstructorKind { category, domain, package };
+      
+      // -- Data structure for a constructor.
+      struct Constructor {
+         Identifier name;
+         Identifier abbrev;
+         String source_file;
+         String object_file;
+         ConstructorKind kind;
+      };
+   }
+}
+
+// -- specialize helper function objects
+namespace std {
+   template<>
+   struct hash<OpenAxiom::VM::Constructor> {
+      using H = hash<OpenAxiom::VM::Identifier>;
+      H::result_type operator()(const Constructor& c) const {
+         return h(c.name);
+      }
+
+      H h;
+   };
+
+   template<>
+   struct equal_to<OpenAxiom::VM::Constructor> {
+      using E = equal_to<OpenAxiom::VM::Identifier>;
+      using arg_type = OpenAxiom::VM::Constructor;
+      bool operator()(const arg_type& x, const arg_type& y) const {
+         return e(x.name, y.name);
+      }
+      E e;
+   };
+}
+
+#endif  // OPENAXIOM_CONSTRUCTOR_included