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