Added a test for unallocated_resource with INVALID_HANDLE_VALUE on Wi…

…ndows.

test/compile/unallocated_resource_win_invalid_handle_value.cpp

@@ -0,0 +1,51 @@
+/*
+ * Distributed under the Boost Software License, Version 1.0.
+ * (See accompanying file LICENSE_1_0.txt or copy at
+ * https://www.boost.org/LICENSE_1_0.txt)
+ *
+ * Copyright (c) 2024 Andrey Semashev
+ */
+/*!
+ * \file   unallocated_resource_win_invalid_handle_value.cpp
+ * \author Andrey Semashev
+ *
+ * \brief  This file tests that \c unallocated_resource supports
+ *         \c INVALID_HANDLE_VALUE on Windows, as is described in the docs.
+ *
+ * This code relies on MSVC-specific behavior, which allows* \c INVALID_HANDLE_VALUE
+ * to be specified in non-type template parameters.
+ */
+
+#include <boost/config.hpp>
+
+#if defined(BOOST_WINDOWS) && defined(BOOST_MSVC) && \
+    !defined(BOOST_NO_CXX17_FOLD_EXPRESSIONS) && !defined(BOOST_NO_CXX17_AUTO_NONTYPE_TEMPLATE_PARAMS)
+
+#include <cstddef>
+#include <windows.h>
+#include <boost/core/functor.hpp>
+#include <boost/scope/unique_resource.hpp>
+
+int main()
+{
+    boost::scope::unique_resource<
+        HANDLE,
+        boost::core::functor< CloseHandle >,
+        boost::scope::unallocated_resource< INVALID_HANDLE_VALUE, (HANDLE)NULL >
+    > ur;
+    (void)ur;
+
+    return 0;
+}
+
+#else // defined(BOOST_WINDOWS) ...
+
+#include <boost/config/pragma_message.hpp>
+
+BOOST_PRAGMA_MESSAGE("Skipping test because it is not supported on the platform/compiler/C++ version.")
+
+int main()
+{
+}
+
+#endif // defined(BOOST_WINDOWS) ...