linux c++读取ini

#include <iostream>
#include <fstream>
#include <sstream>
#include <string>
#include <unordered_map>

class IniParser {
public:
    std::unordered_map<std::string, std::unordered_map<std::string, std::string>> data;

    void parse(const std::string& filename) {
        std::ifstream file(filename);
        std::string line;
        std::string current_section;

        while (std::getline(file, line)) {
            // 去除行首尾空白字符
            line.erase(0, line.find_first_not_of(" \t\r\n"));
            line.erase(line.find_last_not_of(" \t\r\n") + 1);

            if (line.empty() || line[0] == ';' || line[0] == '#') {
                continue; // 跳过注释和空行
            }

            if (line[0] == '[' && line.back() == ']') {
                current_section = line.substr(1, line.size() - 2);
            } else {
                size_t eq_pos = line.find('=');
                if (eq_pos != std::string::npos) {
                    std::string key = line.substr(0, eq_pos);
                    std::string value = line.substr(eq_pos + 1);
                    data[current_section][key] = value;
                }
            }
        }
    }

    std::string get(const std::string& section, const std::string& key, const std::string& default_value = "") const {
        auto section_it = data.find(section);
        if (section_it != data.end()) {
            auto key_it = section_it->second.find(key);
            if (key_it != section_it->second.end()) {
                return key_it->second;
            }
        }
        return default_value;
    }
};

int main() {
    IniParser parser;
    parser.parse("config.ini");

    std::string username = parser.get("User", "Name", "default_user");
    int timeout = std::stoi(parser.get("Network", "Timeout", "30"));

    std::cout << "Username: " << username << std::endl;
    std::cout << "Timeout: " << timeout << " seconds" << std::endl;

    return 0;
}