Squashed 'kiwi/' content from commit 268028e

git-subtree-dir: kiwi
git-subtree-split: 268028ee4a694dcd89e4b1e683bf2f9ac48c08d9

kiwi/expression.h

@@ -0,0 +1,62 @@
+/*-----------------------------------------------------------------------------
+| 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 <vector>
+#include "term.h"
+
+namespace kiwi
+{
+
+class Expression
+{
+
+public:
+    Expression(double constant = 0.0) : m_constant(constant) {}
+
+    Expression(const Term &term, double constant = 0.0) : m_terms(1, term), m_constant(constant) {}
+
+    Expression(std::vector<Term> terms, double constant = 0.0) : m_terms(std::move(terms)), m_constant(constant) {}
+
+    Expression(const Expression&) = default;
+
+    // Could be marked noexcept but for a bug in the GCC of the manylinux1 image
+    Expression(Expression&&) = default;
+
+    ~Expression() = default;
+
+    const std::vector<Term> &terms() const
+    {
+        return m_terms;
+    }
+
+    double constant() const
+    {
+        return m_constant;
+    }
+
+    double value() const
+    {
+        double result = m_constant;
+
+        for (const Term &term : m_terms)
+            result += term.value();
+
+        return result;
+    }
+
+    Expression& operator=(const Expression&) = default;
+
+    // Could be marked noexcept but for a bug in the GCC of the manylinux1 image
+    Expression& operator=(Expression&&) = default;
+
+private:
+    std::vector<Term> m_terms;
+    double m_constant;
+};
+
+} // namespace kiwi