Let's start a Position for generic coords

include/kami/position.h

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+/*-
+ * Copyright (c) 2020 The Johns Hopkins University Applied Physics
+ * Laboratory LLC
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation files
+ * (the "Software"), to deal in the Software without restriction,
+ * including without limitation the rights to use, copy, modify, merge,
+ * publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT.  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#pragma once
+#ifndef KAMI_POSITION_H
+//! @cond SuppressGuard
+#define KAMI_POSITION_H
+//! @endcond
+
+#include <variant>
+
+#include <kami/grid1d.h>
+#include <kami/grid2d.h>
+#include <kami/hexgrid.h>
+
+namespace kami {
+    typedef std::variant <
+    kami::GridCoord1D,
+    kami::GridCoord2D,
+    kami::HexCoord
+    > Position;
+}
+
+#endif //KAMI_POSITION_H

test/unit-kami-position.cc

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+/*-
+ * Copyright (c) 2022 The Johns Hopkins University Applied Physics
+ * Laboratory LLC
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation files
+ * (the "Software"), to deal in the Software without restriction,
+ * including without limitation the rights to use, copy, modify, merge,
+ * publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT.  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include <kami/position.h>
+
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+
+using namespace kami;
+
+class PositionTest : public ::testing::Test {
+protected:
+    Position pos_foo = GridCoord1D(5);
+    Position pos_bar = GridCoord2D(2, 5);
+};
+
+TEST_F(PositionTest, DefaultConstructor) {
+    EXPECT_EQ(pos_foo, pos_foo);
+    EXPECT_NE(pos_foo, pos_bar);
+}
+
+int main(int argc, char **argv) {
+    ::testing::InitGoogleTest(&argc, argv);
+    return RUN_ALL_TESTS();
+}
+