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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_STRUCTURE_included
+#define OPENAXIOM_STRUCTURE_included
+
+#include <iterator>
+
+namespace OpenAxiom {
+ // -- helper classes for structural abstractions --
+ namespace structure {
+ // unary structures
+ template<typename T>
+ struct unary {
+ explicit constexpr unary(const T& t) : arg(t) { };
+ constexpr const T& operand() const { return arg; }
+ private:
+ const T arg;
+ };
+
+ // binary structures
+ template<typename T, typename U = T>
+ struct binary {
+ constexpr binary(const T& t, const U& u) : arg0(t), arg1(u) { };
+ constexpr const T& first() const { return arg0; }
+ constexpr const U& second() const { return arg1; }
+ private:
+ const T arg0;
+ const U arg1;
+ };
+
+ // ternary structures
+ template<typename T, typename U = T, typename V = U>
+ struct ternary {
+ constexpr ternary(const T& t, const U& u, const V& v)
+ : arg0(t), arg1(u), arg2(v) { }
+ constexpr const T& first() const { return arg0; }
+ constexpr const U& second() const { return arg1; }
+ constexpr const V& third() const { return arg2; }
+ private:
+ const T arg0;
+ const U arg1;
+ const V arg2;
+ };
+ }
+}
+
+#endif // OPENAXIOM_STRUCTURE_included