将设置/获取请求映射到 C++ 类/结构更改

I'm trying to figure out what is the best approach here. Basically I have a system where I receive external requests in order to set/get values in my model. The problem is that my model consists on C++ classes, which can be nested, whereas the requests are simple (key, value) pairs.

例如:

struct Foo {
    void setX(int x);
    int getX() const;

    struct Boo {
        void setY(float y);
        float getY() const;
    }:
};

如果我收到一个对给定元素 e 说 set(y, 21) 的请求，那么我需要执行的操作将根据 foo 和 boo 是否已经存在而有所不同.必须考虑每个属性的不同可能性最终会编写大量代码.

get(map, key)
put(pmap, key, val)

pmap[key];
pmap[key] = newval; // if not const/readonly

put("age",properties,fred,new_age);
put("gpa",properties,fred,new_gpa);