Merge commit '147125babfc18abf586237344d6dab5a4bd1e79f' as 'libs/cli11'

libs/cli11/tests/informational.cpp

@@ -0,0 +1,56 @@
+// Copyright (c) 2017-2022, University of Cincinnati, developed by Henry Schreiner
+// under NSF AWARD 1414736 and by the respective contributors.
+// All rights reserved.
+//
+// SPDX-License-Identifier: BSD-3-Clause
+
+#ifdef CLI11_SINGLE_FILE
+#include "CLI11.hpp"
+#else
+#include "CLI/CLI.hpp"
+#endif
+
+#include <iostream>
+
+int main() {
+    std::cout << "\nCLI11 information:\n";
+
+    std::cout << "  C++ standard: ";
+#if defined(CLI11_CPP20)
+    std::cout << 20;
+#elif defined(CLI11_CPP17)
+    std::cout << 17;
+#elif defined(CLI11_CPP14)
+    std::cout << 14;
+#else
+    std::cout << 11;
+#endif
+    std::cout << "\n";
+
+    std::cout << "  __has_include: ";
+#ifdef __has_include
+    std::cout << "yes\n";
+#else
+    std::cout << "no\n";
+#endif
+
+#if CLI11_OPTIONAL
+    std::cout << "  [Available as CLI::optional]";
+#else
+    std::cout << "  No optional library found\n";
+#endif
+
+#if CLI11_STD_OPTIONAL
+    std::cout << "  std::optional support active\n";
+#endif
+
+#if CLI11_EXPERIMENTAL_OPTIONAL
+    std::cout << "  std::experimental::optional support active\n";
+#endif
+
+#if CLI11_BOOST_OPTIONAL
+    std::cout << "  boost::optional support active\n";
+#endif
+
+    std::cout << std::endl;
+}