# include <cppad/cppad.hpp>

# include <sstream>  // std::ostringstream
# include <string>   // std::string
# include <iomanip>  // std::setprecision, setw, setfill, right

namespace {
     template <class S>
     void set_ostream(S &os)
     {     os
          << std::setprecision(4) // 4 digits of precision
          << std::setw(6)         // 6 characters per field
          << std::setfill(' ')    // fill with spaces
          << std::right;          // adjust value to the right
     }
}

bool ad_output(void)
{     bool ok = true;

     // This output stream is an ostringstream for testing purposes.
     // You can use << with other types of streams; i.e., std::cout.
     std::ostringstream stream;

     // ouput an AD<double> object
     CppAD::AD<double>  pi = 4. * atan(1.); // 3.1415926536
     set_ostream(stream);
     stream << pi;

     // ouput a VecAD<double>::reference object
     CppAD::VecAD<double> v(1);
     CppAD::AD<double> zero(0);
     v[zero]   = exp(1.);                  // 2.7182818285
     set_ostream(stream);
     stream << v[zero];

     // convert output from stream to string
     std::string str = stream.str();

     // check the output
     ok      &= (str == " 3.142 2.718");

     return ok;
}