将 C++ 类转换为 JSON

我想创建一个包含类的实例变量的JSON字符串.

例如

class Example {  
    std::string string;  
    std::map<std::string, std:string> map;  
    std::vector<int> vector;  
};

将成为:

{
    "string":"the-string-value",
    "map": {
        "key1":"val1",
        "key2":"val2"
    },
    "vector":[1,2,3,4]
}

I've looked into several C++ libraries for creating JSON and they all seem incredibly complex. I'd like something similar to Javascript's JSON.stringify(object). In other words just pass a std::map to it and receive a string. The map could contain other maps, vectors, lists, strings, numbers and bools.

最好的方法是什么？

Thanks for your help.

Edit

我已经调查了以下几点:

json spirit, jsoncpp, zoolib, JOST, CAJUN, libjson, nosjob, JsonBox, jsonme--

据我所知，我可以构造一个单独的JSON对象，如下面的答案所示，然后转换为JSON.我希望能够将我的内容存储在标准集合中并进行转换.

Edit 2

Okay, scrap the idea of serializing a class since it appears that's impossible with C++'s lack of reflection.

有没有一种很好的方法可以将包含std:map、std::Vector、std::list、number、string和bools的std::map转换为JSON，而不必更改数据类型或将数据复制到新的数据类型？

谢谢