# include <cppad/cppad.hpp>

bool Value(void)
{     bool ok = true;
     using CppAD::AD;
     using CppAD::Value;

     // domain space vector
     size_t n = 2;
     CPPAD_TESTVECTOR(AD<double>) x(n);
     x[0] = 3.;
     x[1] = 4.;

     // check value before recording
     ok &= (Value(x[0]) == 3.);
     ok &= (Value(x[1]) == 4.);

     // declare independent variables and start tape recording
     CppAD::Independent(x);

     // range space vector
     size_t m = 1;
     CPPAD_TESTVECTOR(AD<double>) y(m);
     y[0] = - x[1];

     // cannot call Value(x[j]) or Value(y[0]) here (currently variables)
     AD<double> p = 5.;        // p is a parameter (does not depend on x)
     ok &= (Value(p) == 5.);

     // create f: x -> y and stop tape recording
     CppAD::ADFun<double> f(x, y);

     // can call Value(x[j]) or Value(y[0]) here (currently parameters)
     ok &= (Value(x[0]) ==  3.);
     ok &= (Value(x[1]) ==  4.);
     ok &= (Value(y[0]) == -4.);

     return ok;
}