JSON array with multiple values c++ -

i have body request example:

{    "users": [{         "userid": 123     }, {         "userid": 1234     }] } 

for previous example receive 1 std::list<usersid>* vusers have userid (in case '123' , '1234'), create cjson array, iterate list , userid. (note: usersid 1 auxiliar class use , receive 1 int in constructor)

cjson* cjsonusers = cjson_createarray(); cjson_additemtoobject(root, "vusers", cjsonusers);      std::list<usersid>::const_iterator itusers = vusers->begin();     while (itusers != vusers->end())     {         cjson *cjsonvnode = cjson_createobject();         cjson_additemtoarray(cjsonusers, cjsonuser);          cjson_addnumbertoobject(cjsonuser, "userid", itusers->userid);         ++itvnodes;     } 

but know want same make more simple/easy , need change body request this:

{     "users": {         "userid": [123, 1234]     } } 

i'm using c++ library -> https://github.com/davegamble/cjson dont understand how implement modification need.

edit 2 (parse json)

cjson* cjsonusers = cjson_getobjectitem(root, "users"); if (!cjsonusers) return 0; if (cjsonusers->type != cjson_array) return 0;  std::list<vuserid>* users = new std::list<vuserid>(); cjson* cjsonvuser; cjson_arrayforeach(cjsonvuser, cjsonusers) {     cjson* cjsonvuserid = cjson_getobjectitem(cjsonvuser, "userid");     if (!cjsonvuserid) continue;  int user_id = cjsonvuserid->valueint;  vuserid userid(user_id); users->push_back(userid); } 

something work, is, create object , array outside of loop, , insert numbers inside loop:

cjson* cjsonusers = cjson_createobject(); cjson_additemtoobject(root, "users", cjsonusers);  cjson* cjsonuserid = cjson_createarray(); cjson_additemtoobject(cjsonusers, "userid", cjsonuserid);  std::list<usersid>::const_iterator itusers = vusers->begin(); while (itusers != vusers->end()) {     cjson_additemtoarray(cjsonuserid, cjson_createnumber(itusers->userid));     ++itvnodes; } 

note there languages out there more convenient manipulate json if have flexibility (disclaimer: involved in design of of these). of course there use cases when have use c++ , in library makes lot of sense.

with languages such c++ or java, there impedance mismatch between objects in classical sense, , data formats xml or json. example, standardized, declarative , functional xquery 3.1 not need code transform first document second:

let $original-document := json-doc("users.json") return map {   "users" : map {     "userid" : array { $original-document?users?*?userid }   } }