Deserializing Issue with string type. about x2struct HOT 1 CLOSED

#include <iostream>
#include "x2struct/x2struct.hpp"

using namespace std;

struct ConnectionProp{
    int connectionId;
    std::string connectionName;
    double timeout;
    XTOSTRUCT(M(connectionId,timeout),O(connectionName));
};

int main(int argc, char*argv[]) {
    ConnectionProp x;
    string jstr="{\"connectionId\":3,\"connectionName\":\"JAY\",\"timeout\":3.55566}";
    x2struct::X::loadjson(jstr, x, false); 
    cout<<x.connectionId<<endl;
    cout<<x.connectionName<<endl;
    cout<<x.timeout<<endl;
    return 0;
}