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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
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
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