Rapidjson: AddMember can`t set string as key

[yangaiche]

string key="hello";
Value v;
json_temp.AddMember(key.c_str(), v, json_temp.GetAllocator());  //compile error

json_temp.AddMember("hello", v, json_temp.GetAllocator());  //compile OK

how could I solve this problem?

[pah]

You need to construct a temporary Value, creating a _copy_ of the string in case of a dynamic name:

Value n(key.c_str(), json_temp.GetAllocator());
json_temp.AddMember(n, v);

See also the example in the tutorial.

[D-r-P-3-p-p-3-r]

And what sense does it make that you have to create a temporary?