1 files changed, 69 insertions, 0 deletions
diff --git a/src/libixion/impl_types.hpp b/src/libixion/impl_types.hpp
new file mode 100644
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--- /dev/null
+++ b/src/libixion/impl_types.hpp
@@ -0,0 +1,69 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#pragma once
+
+#include <ixion/matrix.hpp>
+#include <ixion/types.hpp>
+
+#include <variant>
+#include <string>
+
+namespace ixion {
+
+class matrix;
+
+/**
+ * Similar to stack_value but does not store a reference; it only stores a
+ * static value.
+ */
+class resolved_stack_value
+{
+    // Keep the type ordering in sync with value_type's.
+    using store_type = std::variant<matrix, double, std::string>;
+    store_type m_value;
+public:
+
+    enum class value_type { matrix, numeric, string };
+
+    resolved_stack_value(matrix v);
+    resolved_stack_value(double v);
+    resolved_stack_value(std::string v);
+
+    value_type type() const;
+
+    const matrix& get_matrix() const;
+    double get_numeric() const;
+    const std::string& get_string() const;
+};
+
+template<typename T>
+class formula_op_result
+{
+    using store_type = std::variant<T, formula_error_t>;
+    store_type m_value;
+
+public:
+    formula_op_result(T v) : m_value(std::move(v)) {}
+    formula_op_result(formula_error_t err) : m_value(err) {}
+
+    operator bool() const { return m_value.index() == 0; }
+
+    T operator*() const
+    {
+        return std::get<T>(m_value);
+    }
+
+    formula_error_t error() const
+    {
+        return std::get<formula_error_t>(m_value);
+    }
+};
+
+} // namespace ixion
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */