[vcpkg] Implement a warning when running in a mismatched Visual Studio prompt

1 files changed, 39 insertions, 0 deletions

diff --git a/toolsrc/src/vcpkg-test/optional.cpp b/toolsrc/src/vcpkg-test/optional.cpp
new file mode 100644
index 000000000..ce728208f
--- /dev/null
+++ b/toolsrc/src/vcpkg-test/optional.cpp
@@ -0,0 +1,39 @@
+#include <catch2/catch.hpp>
+#include <vcpkg/base/optional.h>
+#include <vector>
+
+namespace
+{
+    struct identity_projection
+    {
+        template<class T>
+        const T& operator()(const T& val) noexcept
+        {
+            return val;
+        }
+    };
+}
+
+TEST_CASE ("equal", "[optional]")
+{
+    using vcpkg::Optional;
+
+    CHECK(Optional<int>{} == Optional<int>{});
+    CHECK(!(Optional<int>{} == Optional<int>{42}));
+    CHECK(!(Optional<int>{42} == Optional<int>{}));
+    CHECK(!(Optional<int>{1729} == Optional<int>{42}));
+    CHECK(Optional<int>{42} == Optional<int>{42});
+}
+
+TEST_CASE ("common_projection", "[optional]")
+{
+    using vcpkg::common_projection;
+    std::vector<int> input;
+    CHECK(!common_projection(input, identity_projection{}).has_value());
+    input.push_back(42);
+    CHECK(common_projection(input, identity_projection{}).value_or_exit(VCPKG_LINE_INFO) == 42);
+    input.push_back(42);
+    CHECK(common_projection(input, identity_projection{}).value_or_exit(VCPKG_LINE_INFO) == 42);
+    input.push_back(1729);
+    CHECK(!common_projection(input, identity_projection{}).has_value());
+}