Squashed 'libs/cli11/' content from commit dcbcb47

git-subtree-dir: libs/cli11
git-subtree-split: dcbcb4721dda5dab0a56d9faaaee50e6a30f7758

examples/subcom_in_files/subcommand_main.cpp

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+// 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
+
+#include "subcommand_a.hpp"
+#include <CLI/CLI.hpp>
+
+int main(int argc, char **argv) {
+    CLI::App app{"..."};
+
+    // Call the setup functions for the subcommands.
+    // They are kept alive by a shared pointer in the
+    // lambda function held by CLI11
+    setup_subcommand_a(app);
+
+    // Make sure we get at least one subcommand
+    app.require_subcommand();
+
+    // More setup if needed, i.e., other subcommands etc.
+
+    CLI11_PARSE(app, argc, argv);
+
+    return 0;
+}