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libraries/M5Utility/test/optional/assignment.cpp

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+#include <gtest/gtest.h>
+#include <m5_utility/stl/optional.hpp>
+
+TEST(Optional, Assignment)
+{
+    m5::stl::optional<int> o1 = 42;
+    m5::stl::optional<int> o2 = 12;
+    m5::stl::optional<int> o3;
+
+    o1 = o1;
+    EXPECT_TRUE(*o1 == 42);
+
+    o1 = o2;
+    EXPECT_TRUE(*o1 == 12);
+
+    o1 = o3;
+    EXPECT_TRUE(!o1);
+
+    o1 = 42;
+    EXPECT_TRUE(*o1 == 42);
+
+    o1 = m5::stl::nullopt;
+    EXPECT_TRUE(!o1);
+
+    o1 = std::move(o2);
+    EXPECT_TRUE(*o1 == 12);
+
+    m5::stl::optional<short> o4 = 42;
+
+    o1 = o4;
+    EXPECT_TRUE(*o1 == 42);
+
+    o1 = std::move(o4);
+    EXPECT_TRUE(*o1 == 42);
+}
+
+TEST(Optional, AssignmentReference)
+{
+    auto i = 42;
+    auto j = 12;
+
+    m5::stl::optional<int&> o1 = i;
+    m5::stl::optional<int&> o2 = j;
+    m5::stl::optional<int&> o3;
+
+    o1 = o1;
+    EXPECT_TRUE(*o1 == 42);
+    EXPECT_TRUE(&*o1 == &i);
+
+    o1 = o2;
+    EXPECT_TRUE(*o1 == 12);
+
+    o1 = o3;
+    EXPECT_TRUE(!o1);
+
+    auto k = 42;
+    o1     = k;
+    EXPECT_TRUE(*o1 == 42);
+    EXPECT_TRUE(*o1 == i);
+    EXPECT_TRUE(*o1 == k);
+    EXPECT_TRUE(&*o1 != &i);
+    EXPECT_TRUE(&*o1 == &k);
+
+    k = 12;
+    EXPECT_TRUE(*o1 == 12);
+
+    o1 = m5::stl::nullopt;
+    EXPECT_TRUE(!o1);
+
+    o1 = std::move(o2);
+    EXPECT_TRUE(*o1 == 12);
+}