Append an int to a std::string
c++, std
Solution
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));
Problem
Why is this code gives an Debug Assertion Fail? ``` std::string query; int ClientID = 666; query = "select logged from login where id = "; query.append((char *)ClientID); ```