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我有一个配置（“/home/work/father.config”）看起来像：

father_config = {
  child_config = "/home/work/child.config";
  father_int = 1;
};

在 /home/work/child.config 中：

child_config = {
  child_int =2;
};

我想要的是从中father_int得到child_cfg。

请看代码：

  #include <iostream>
  #include <libconfig.h++>
  
  using namespace std;
  
  int main() {
    libconfig::Config father_cfg;
    father_cfg.readFile("./father.cfg");
    const libconfig::Setting& father_setting = father_cfg.lookup("father_setting");
    const std::string& child_path = father_setting.lookup("child_path");
    libconfig::Config child_cfg;
    child_cfg.readFile(child_path);
    libconfig::Setting& child_setting = child_cfg.lookup("child_setting");
    auto & s = child_cfg.getRoot().add("father_int", libconfig::Setting::TypeGroup);// father_setting.lookup("father_int");
    s = father_setting;  // !!!!!!! this doesn't work
    int father_int = child_setting.lookup("father_int");  // the ulimate purpose is to make father int can be found in child_cfg
    cout << father_int;
  }

我知道如果father_int 是int 类型并且key-father_int 不会改变，我可以使用：

int father_int = father_setting.lookup("father_int");
child_cfg.GetRoot().add("father_int", libconfig::Setting::TypeInt) = father_int;

但我希望这可以更灵活，需要添加libconfig::Setting::TypeGroup而不是libconfig::Setting::TypeInt，

你能帮忙吗？

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