• libcurl
• RapidJSON

#include "docker.h"
int main(){
    Docker client = Docker();

    JSON_DOCUMENT doc = client.list_containers(true); 
    std::cout << jsonToString(doc) << std::endl;

    return 0;
}

Every return type is JSON_OBJECT (alias of rapidjson::Document)

Refer to RapidJSON for the detailed usage

Object o;
 - success        [bool]                  : if succeeded to request
 - data           [Object/Array/string]   : actual data by server
 - code(optional) [int]                   : http status code if 'success' is false

Data type of 'data' depends on API, but it would be Object if 'success' is false.

{
  "success": false,
  "code": 404,
  "data": {
      "message": "No such container: 5d271b3a52263330348b71948bd25cda455a49f7e7d69cfc73e6b2f3b5b41a4c" 
  }
} 

{
  "success": true ,
  "data": {
      "Architecture": "x86_64",
      "SystemTime": "2018-05-23T19:26:54.357768797+09:00" 
 }
}

For remote access, you sould first bind Docker Server to a port. You can bind by adding -H tcp://0.0.0.0:<port> in service daemon.

# cat /lib/systemd/system/docker.service
....
[Service]
Type=notify
ExecStart=/usr/bin/docker daemon -H fd:// -H tcp://0.0.0.0:4000
....

#include "docker.h"
int main(){
    Docker client = Docker("http://<ip>:<port>");

    JSON_DOCUMENT doc = client.list_containers(true); 
    std::cout << jsonToString(doc) << std::endl;

    return 0;
}

• system_info
• docker_version

• list_images

• list_containers
• inspect_container
• top_container
• logs_container
• create_container
• start_container
• get_container_changes
• stop_container
• kill_container
• pause_container
• wait_container
• delete_container
• unpause_container
• restart_container
• attach_to_container