Append an int to a std::string

The std::string::append() method expects its argument to be a NULL terminated string (char*).

There are several approaches for producing a string containg an int:

• std::ostringstream#include <sstream> std::ostringstream s; s << "select logged from login where id = " << ClientID; std::string query(s.str());
• std::to_string (C++11)std::string query("select logged from login where id = " + std::to_string(ClientID));
• boost::lexical_cast#include <boost/lexical_cast.hpp> std::string query("select logged from login where id = " + boost::lexical_cast<std::string>(ClientID));