带有 json 文件的 C++ Boost 程序选项

Question

可以使用 boost 程序选项库：http : //www.boost.org/doc/libs/1_64_0/doc/html/program_options.html

在这里读取 json 格式的文件作为输入文件？

或者，如果我在 json 文件中有一些配置，我需要自己解析它，例如：http : //www.boost.org/doc/libs/1_64_0/doc/html/property_tree.html

Answer 1

我遇到了同样的问题。这是我基于 property_tree 为 program_options 库实现的 JSON 解析器：

template <class charT> void parseChildren(std::string prefix, boost::property_tree::ptree& tree, boost::program_options::parsed_options& options)
{
    if (tree.size() == 0)
    {
        //cut first dot
        std::basic_string<charT> name = prefix.substr(1);
        std::basic_string<charT> value = tree.data();

        boost::program_options::basic_option<charT> opt;
        opt.string_key = name;
        opt.value.push_back(value);
        opt.unregistered = (options.description->find_nothrow(name, false) == nullptr);
        opt.position_key = -1;
        options.options.push_back(opt);
    }
    else
    {
        for (auto it = tree.begin(); it != tree.end(); ++it)
        {
            parseChildren<charT>(prefix + "." + it->first, it->second, options);
        }
    }
}

template <class charT>
void parseJsonOptions(std::basic_istream<charT>& is, boost::program_options::parsed_options& options)
{
        boost::property_tree::basic_ptree<std::basic_string<charT>, std::basic_string<charT>> pt;
        boost::property_tree::read_json(is, pt);

        parseChildren<charT>(std::basic_string<charT>(), pt, options);
}

template <class charT>
boost::program_options::basic_parsed_options<charT> parse_json_config_file(std::basic_istream<charT>& is, const boost::program_options::options_description& desc, bool allow_unregistered = false)
{     
    // do any option check here

    boost::program_options::parsed_options result(&desc);
    parseJsonOptions(is, result);

    return boost::program_options::basic_parsed_options<charT>(result);
}

像这样使用它：

po::variables_map vm;
std::ifstream configFileStream(configFilePath_.generic_string());

store(parse_json_config_file(configFileStream, algorithmsDesc_), vm);
notify(vm);