使用rapidjson，传入一个json对象和一个key，返回key对应得所有vaule

类似与是实现jsonpath得功能，我需要实现一个函数传入json对象和关键字key，返回key所对应的vaule，jsonpath中可以直接调用$..author:获取以下json中所有author的值

{
    "store": {
        "book": [
            {
                "category": "reference",
                "author": "Nigel Rees",
                "title": "Sayings of the Century",
                "price": 8.95
            },
            {
                "category": "fiction",
                "author": "Evelyn Waugh",
                "title": "Sword of Honour",
                "price": 12.99
            },
            {
                "category": "fiction",
                "author": "Herman Melville",
                "title": "Moby Dick",
                "isbn": "0-553-21311-3",
                "price": 8.99
            },
            {
                "category": "fiction",
                "author": "J. R. R. Tolkien",
                "title": "The Lord of the Rings",
                "isbn": "0-395-19395-8",
                "price": 22.99
            }
        ],
        "bicycle": {
            "color": "red",
            "price": 19.95
        }
    },
    "expensive": 10
}

我所了解您写过得rapidjson遍历得文章，希望可以指点一下，感谢

该用SQLite了