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a_double_cond_assign_xam.cpp

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C++: a_double Conditional Assignment: Example and Test

# include <cstdio>
# include <cppad/py/cppad_py.hpp>

bool a_double_cond_assign_xam(void) {
   using cppad_py::a_double;
   using cppad_py::vec_double;
   using cppad_py::vec_a_double;
   using cppad_py::d_fun;
   //
   // initialize return variable
   bool ok = true;
   //------------------------------------------------------------------------
   int n_ind = 4;
   int n_dep = 1;
   //
   // create ax (value of independent variables does not matter)
   vec_double x(n_ind);
   x[0] = 0.0;
   x[1] = 1.0;
   x[2] = 2.0;
   x[3] = 3.0;
   vec_a_double ax = cppad_py::independent(x);
   //
   // arguments to conditional assignment
   a_double left = ax[0];
   a_double right = ax[1];
   a_double if_true = ax[2];
   a_double if_false = ax[3];
   //
   // assignment
   a_double target;
   target.cond_assign(
      "<",
      left,
      right,
      if_true,
      if_false
   );
   //
   // f(x) = taget
   vec_a_double ay(n_dep);
   ay[0] = target;
   d_fun f(ax, ay);
   //
   // assignment with different independent variable values
   x[0] = 9.0; // left
   x[1] = 8.0; // right
   x[2] = 7.0; // if_true
   x[3] = 6.0; // if_false
   int p = 0;
   vec_double y = f.forward(p, x);
   ok = ok && y[0] == 6.0;
   //
   return( ok  );
}