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// Copyright (c) 2017-2025, 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 <memory>
#include <string>
template <typename T> class DeltaRange : public CLI::Validator {
public:
T center_point;
T delta;
DeltaRange(const T ¢er, const T &range)
: CLI::Validator(
[this](const std::string &value) -> std::string {
T newValue;
auto result = CLI::detail::lexical_cast(value, newValue);
if(!(result && this->check(newValue))) {
return std::string("value not within range");
}
return std::string{};
},
"RANGE"),
center_point(center), delta(range) {}
CLI11_NODISCARD bool check(const T &test) const {
return (test >= (center_point - delta)) && (test <= (center_point + delta));
}
CLI11_NODISCARD T center() const { return center_point; }
CLI11_NODISCARD T range() const { return delta; }
void center(const T &value) { center_point = value; }
void range(const T &value) { delta = value; }
};
int main(int argc, char **argv) {
/* this application creates custom validator which is a range center+/- range The center and range can be defined by
* other command line options and are updated dynamically
*/
CLI::App app("custom range validator");
std::string value;
auto dr = std::make_shared<DeltaRange<int>>(7, 3);
app.add_option("--number", value, "enter value in the related range")->check(dr)->required();
app.add_option_function<int>("--center", [&dr](int new_center) { dr->center(new_center); })->trigger_on_parse();
app.add_option_function<int>("--range", [&dr](int new_range) { dr->range(new_range); })->trigger_on_parse();
CLI11_PARSE(app, argc, argv);
std::cout << "number " << value << " in range = " << dr->center() << " +/- " << dr->range() << '\n';
return 0;
}
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