Restarted the production of the app

libs/CLI11/examples/validators.cpp

@@ -0,0 +1,25 @@
+// 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 <CLI/CLI.hpp>
+#include <iostream>
+#include <string>
+
+int main(int argc, char **argv) {
+
+    CLI::App app("Validator checker");
+
+    std::string file;
+    app.add_option("-f,--file,file", file, "File name")->check(CLI::ExistingFile);
+
+    int count{0};
+    app.add_option("-v,--value", count, "Value in range")->check(CLI::Range(3, 6));
+    CLI11_PARSE(app, argc, argv);
+
+    std::cout << "Try printing help or failing the validator" << std::endl;
+
+    return 0;
+}