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AD Output Operator: Example and Test
`

    # 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;
    }

`

Input File: example/general/ad_output.cpp