AD Output Operator: Example and Test
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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/ad_output.cpp