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libraries/M5Utility/test/optional/constructors.cpp

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+#include <gtest/gtest.h>
+#include <m5_utility/stl/optional.hpp>
+#include <vector>
+
+namespace constructor {
+struct foo {
+    foo() = default;
+
+    foo(foo &) = delete;
+
+    foo(foo &&) noexcept
+    {
+    }
+};
+}  // namespace constructor
+
+TEST(Optional, Constructors)
+{
+    m5::stl::optional<int> o1;
+    EXPECT_TRUE(!o1);
+
+    m5::stl::optional<int> o2 = m5::stl::nullopt;
+    EXPECT_TRUE(!o2);
+
+    m5::stl::optional<int> o3 = 42;
+    EXPECT_TRUE(*o3 == 42);
+
+    m5::stl::optional<int> o4 = o3;
+    EXPECT_TRUE(*o4 == 42);
+
+    m5::stl::optional<int> o5 = o1;
+    EXPECT_TRUE(!o5);
+
+    m5::stl::optional<int> o6 = std::move(o3);
+    EXPECT_TRUE(*o6 == 42);
+
+    m5::stl::optional<short> o7 = 42;
+    EXPECT_TRUE(*o7 == 42);
+
+    m5::stl::optional<int> o8 = o7;
+    EXPECT_TRUE(*o8 == 42);
+
+    m5::stl::optional<int> o9 = std::move(o7);
+    EXPECT_TRUE(*o9 == 42);
+
+    {
+        m5::stl::optional<int &> o;
+        EXPECT_TRUE(!o);
+
+        m5::stl::optional<int &> oo = o;
+        EXPECT_TRUE(!oo);
+    }
+
+    {
+        auto i                     = 42;
+        m5::stl::optional<int &> o = i;
+        EXPECT_TRUE(o);
+        EXPECT_TRUE(*o == 42);
+
+        m5::stl::optional<int &> oo = o;
+        EXPECT_TRUE(oo);
+        EXPECT_TRUE(*oo == 42);
+    }
+
+    std::vector<constructor::foo> v;
+    v.emplace_back();
+    m5::stl::optional<std::vector<constructor::foo>> ov = std::move(v);
+    EXPECT_TRUE(ov->size() == 1);
+}