C++ boost程序选项短/长参数名称

我已经实现了一个路由，通过迭代

po:：variable\u映射

，打印出我的

boost:：program\u options

对象中可用的所有选项及其当前值

---

有了它，我可以直接打印选项的长名称及其值。但是，我不知道如何从长选项名中检索短选项名（即-h from--help）。有什么建议吗？

我记得在最近的回答中描述了为什么

variable\u map

对选项描述“太晚了”：

简而言之，变量_映射位于库的内部，因此与选项描述（位于中）隔离

你能做什么？ 您可以使用中间结果，即来自以下对象的原始输出：

解析结果作为类的实例返回。通常，该对象直接传递给存储组件。但是，它也可以直接使用，或进行一些附加处理

那么，让我们在这里尝试制作一个示例：

    po::parsed_options const intermediate = po::parse_command_line(ac, av, desc);

    //////////////////////////////////
    // print the extended usage info as per the question
    //
    for (auto& entry : intermediate.options)
    {
        po::option_description const& opt = desc.find(entry.string_key, false, false, false); 

        std::cout << "\nActual tokens involved: ";
        for (auto& tok : entry.original_tokens)
            std::cout << "'" << tok << "' ";
        for (std::string const& v : entry.value)
            std::cout << "\nAssociated value: " << v;
        std::cout << "\n-----------------------------------------------------------\n";
        std::cout << "opt.format_name()        : "        << opt.format_name()                                      << "\n";
        std::cout << "opt.long_name()          : "        << opt.long_name()                                        << "\n";
        std::cout << "opt.canonical_display_name('-'): "  << opt.canonical_display_name(cls::allow_dash_for_short)  << "\n";
        std::cout << "opt.canonical_display_name('/'): "  << opt.canonical_display_name(cls::allow_slash_for_short) << "\n";
        std::cout << "opt.canonical_display_name('--'): " << opt.canonical_display_name(cls::allow_long)            << "\n";
    }

#include <boost/program_options.hpp>
#include <boost/program_options/detail/parsers.hpp>
#include <iostream>

namespace po  = boost::program_options;
namespace cls = po::command_line_style;

int main(int ac, char** av) {
    // Declare the supported options.
    po::options_description desc("Allowed options");
    desc.add_options()
        ("help", "produce help message")
        ("name,n", po::value<std::string>(), "specify the name")
        ("compression,C", po::value<int>(), "set compression level")
        ;

    po::variables_map vm;
    po::parsed_options const intermediate = po::parse_command_line(ac, av, desc);

    //////////////////////////////////
    // print the extended usage info as per the question
    //
    for (auto& entry : intermediate.options)
    {
        po::option_description const& opt = desc.find(entry.string_key, false, false, false); 

        std::cout << "\nActual tokens involved: ";
        for (auto& tok : entry.original_tokens)
            std::cout << "'" << tok << "' ";
        for (std::string const& v : entry.value)
            std::cout << "\nAssociated value: " << v;
        std::cout << "\n-----------------------------------------------------------\n";
        std::cout << "opt.format_name()        : "        << opt.format_name()                                      << "\n";
        std::cout << "opt.long_name()          : "        << opt.long_name()                                        << "\n";
        std::cout << "opt.canonical_display_name('-'): "  << opt.canonical_display_name(cls::allow_dash_for_short)  << "\n";
        std::cout << "opt.canonical_display_name('/'): "  << opt.canonical_display_name(cls::allow_slash_for_short) << "\n";
        std::cout << "opt.canonical_display_name('--'): " << opt.canonical_display_name(cls::allow_long)            << "\n";
    }

    //////////////////////////////////

    po::store(intermediate, vm);
    po::notify(vm);    

    if (vm.count("help")) {
        std::cout << desc << "\n";
        return 1;
    }

    if (vm.count("compression")) {
        std::cout << "Compression level was set to " 
            << vm["compression"].as<int>() << ".\n";
    } else {
        std::cout << "Compression level was not set.\n";
    }
}

#包括
#包括
#包括
名称空间po=boost:：program\u选项；
名称空间cls=po:：命令行样式；
内部主（内部ac，字符**av）{
//声明支持的选项。
采购订单：选项描述描述（“允许选项”）；
说明添加选项（）
（“帮助”，“生成帮助消息”）
（“名称，n”，po:：value（），“指定名称”）
（“压缩，C”，po:：value（），“设置压缩级别”）
;
变量映射虚拟机；
po:：parsed_options const mediate=po:：parse_命令行（ac、av、desc）；
//////////////////////////////////
//根据问题打印扩展使用信息
//
用于（自动输入：中间。选项（&E）
{
po:：option_description const&opt=desc.find（entry.string_key，false，false）；
std：：cout如果您愿意，您仍然可以看到我是如何在这个API中跌跌撞撞地完成的：并且（）如果我们只希望选项的名称不带“-”或“--”，那么opt.canonical\u display\u name（0）/opt.canonical\u display\u name（默认样式）似乎有效。对吗？这对配置文件选项也有效吗？@abhishekgupta我想是的。但这很容易检查。也很难想出其他的理论。
#include <boost/program_options.hpp>
#include <boost/program_options/detail/parsers.hpp>
#include <iostream>

namespace po  = boost::program_options;
namespace cls = po::command_line_style;

int main(int ac, char** av) {
    // Declare the supported options.
    po::options_description desc("Allowed options");
    desc.add_options()
        ("help", "produce help message")
        ("name,n", po::value<std::string>(), "specify the name")
        ("compression,C", po::value<int>(), "set compression level")
        ;

    po::variables_map vm;
    po::parsed_options const intermediate = po::parse_command_line(ac, av, desc);

    //////////////////////////////////
    // print the extended usage info as per the question
    //
    for (auto& entry : intermediate.options)
    {
        po::option_description const& opt = desc.find(entry.string_key, false, false, false); 

        std::cout << "\nActual tokens involved: ";
        for (auto& tok : entry.original_tokens)
            std::cout << "'" << tok << "' ";
        for (std::string const& v : entry.value)
            std::cout << "\nAssociated value: " << v;
        std::cout << "\n-----------------------------------------------------------\n";
        std::cout << "opt.format_name()        : "        << opt.format_name()                                      << "\n";
        std::cout << "opt.long_name()          : "        << opt.long_name()                                        << "\n";
        std::cout << "opt.canonical_display_name('-'): "  << opt.canonical_display_name(cls::allow_dash_for_short)  << "\n";
        std::cout << "opt.canonical_display_name('/'): "  << opt.canonical_display_name(cls::allow_slash_for_short) << "\n";
        std::cout << "opt.canonical_display_name('--'): " << opt.canonical_display_name(cls::allow_long)            << "\n";
    }

    //////////////////////////////////

    po::store(intermediate, vm);
    po::notify(vm);    

    if (vm.count("help")) {
        std::cout << desc << "\n";
        return 1;
    }

    if (vm.count("compression")) {
        std::cout << "Compression level was set to " 
            << vm["compression"].as<int>() << ".\n";
    } else {
        std::cout << "Compression level was not set.\n";
    }
}