Add kiwi lib

thirdparty/include/kiwi/term.h

@@ -0,0 +1,51 @@
+/*-----------------------------------------------------------------------------
+| Copyright (c) 2013-2017, Nucleic Development Team.
+|
+| Distributed under the terms of the Modified BSD License.
+|
+| The full license is in the file LICENSE, distributed with this software.
+|----------------------------------------------------------------------------*/
+#pragma once
+#include <utility>
+#include "variable.h"
+
+
+namespace kiwi
+{
+
+class Term
+{
+
+public:
+
+	Term( const Variable& variable, double coefficient = 1.0 ) :
+		m_variable( variable ), m_coefficient( coefficient ) {}
+
+	// to facilitate efficient map -> vector copies
+	Term( const std::pair<const Variable, double>& pair ) :
+		m_variable( pair.first ), m_coefficient( pair.second ) {}
+
+	~Term() {}
+
+	const Variable& variable() const
+	{
+		return m_variable;
+	}
+
+	double coefficient() const
+	{
+		return m_coefficient;
+	}
+
+	double value() const
+	{
+		return m_coefficient * m_variable.value();
+	}
+
+private:
+
+	Variable m_variable;
+	double m_coefficient;
+};
+
+} // namespace kiwi