Append an int to a std::string [duplicate]

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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));

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