c++怎么解析命令行选项_c++命令行参数解析方法与库使用指南

int main(int argc, char* argv[]) {
    for (int i = 1; i < argc; ++i) {
        std::string arg = argv[i];
        if (arg == "-v" || arg == "--verbose") {
            std::cout << "Verbose mode enabled\n";
        } else if (arg == "-o" && i + 1 < argc) {
            std::cout << "Output file: " << argv[++i] << "\n";
        }
    }
    return 0;
}

#include <unistd.h>
#include <iostream>
<p>int main(int argc, char* argv[]) {
int opt;
while ((opt = getopt(argc, argv, "vo:")) != -1) {
switch (opt) {
case 'v':
std::cout << "Verbose on\n";
break;
case 'o':
std::cout << "Output to: " << optarg << "\n";
break;
default:
std::cerr << "Unknown option\n";
return 1;
}
}
return 0;
}</p>

#include "CLI/CLI.hpp"
#include <iostream>
<p>int main(int argc, char** argv) {
CLI::App app{"My command line tool"};</p><pre class='brush:php;toolbar:false;'>std::string filename;
int count = 1;
bool verbose = false;

app.add_option("-f,--file", filename, "Input file")->required();
app.add_option("-c,--count", count, "Repeat count")->default_val(1);
app.add_flag("-v,--verbose", verbose, "Enable verbose output");

try {
    app.parse(argc, argv);
} catch (const CLI::ParseError &e) {
    return app.exit(e);
}

std::cout << "File: " << filename << ", Count: " << count
          << ", Verbose: " << verbose << "\n";

return 0;

}