前言：仅个人小记。

正文

由于 rapidjson是 “header-only”的C++库，故而直接将头文件目录拷贝到系统目录或者指定目录即可完成安装。

参考材料：
rapidjson代码仓库 https://github.com/Tencent/rapidjson
rapidjson 文档 https://rapidjson.org/md_doc_stream.html

git clone https://github.com/Tencent/rapidjson.git
sudo cp -r /rapidjson/include/rapidjson /usr/local/include # 拷贝到系统目录 

# 执行测试用例
cd rapidjson/example/simpledom 
g++ -std=c++17 simpledom.cpp
./a.out

样例代码

#include <rapidjson/document.h>
#include <rapidjson/writer.h>
#include <rapidjson/stringbuffer.h>
#include <iostream>

using namespace rapidjson;

int main() {
    // 1. Parse a JSON string into DOM.
    const char* json = "{\"project\":\"rapidjson\",\"stars\":10}";
    Document d;
    d.Parse(json);

    // 2. Modify it by DOM.
    Value& s = d["stars"];
    s.SetInt(s.GetInt() + 1);

    // 3. Stringify the DOM
    StringBuffer buffer;
    Writer<StringBuffer> writer(buffer);
    d.Accept(writer);

    // Output {"project":"rapidjson","stars":11}
    std::cout << buffer.GetString() << std::endl;
    return 0;
}

执行结果：