serialization problem, from_json need construct new object

[jiapengwen]

Discussed in #3168

^{Originally posted by jiapengwen November 30, 2021}
show you my code,:

using json = nlohmann::json;

namespace ns {
    void to_json(json& j, const person& p) {
    }
  // here will create new object, but i just want to init my object(outside create) whit json value
    void from_json(const json& j, person& p) {
    }
} // namespace ns


// in othre file
person my_person;
//here init my_person with json (j) value
from_json(j, my_person);

thank you your help

[jiapengwen]

I think you are misunderstood my question, i just want deserialization json to my already create object, but from_fson will create new object, this isn't my purpose

[nlohmann]

Please discuss this in #3168

[jiapengwen]

ok, thanks