lines 125-216 of file: example/class.cpp

{xrst_begin example_ad_double}
{xrst_spell
   ay
   dx
   dy
   ok
}

An Example Using the ad_double Class
####################################
This example mixes the documentation and the example code.
Another choice is to put the documentation and the beginning
an then just have comments in the code.

xrst_indent
***********
This example make uses of ``xrst_indent`` so that
the xrst input can be indented at the same level as the code it is next to.

Begin Function
**************
This function has no arguments and returns a boolean that is true,
if all it's tests pass, and false otherwise.
{xrst_code cpp} */
bool test_ad_double(void)
{
/* {xrst_code}
   {xrst_indent}

   Initialize ok
   *************
   {xrst_code cpp} */
   bool ok = true;
   /* {xrst_code}

   Independent Variable
   ********************
   {xrst_code cpp} */
   double x  = 2.0;
   double dx = 3.0;
   ad_double ax(x, dx);
   /* {xrst_code}

   Addition
   ********
   {xrst_code cpp} */
   {  ad_double ay = ax + ax;
      double    dy = ay.derivative();
      ok          &= dy == 2.0 * dx;
   }
   /* {xrst_code}

   Subtraction
   ***********
   {xrst_code cpp} */
   {  ad_double ay = ax - ax;
      double    dy = ay.derivative();
      ok          &= dy == 0.0;
   }
   /* {xrst_code}

   Multiplication
   **************
   {xrst_code cpp} */
   {  ad_double ay = ax * ax;
      double    dy = ay.derivative();
      ok          &= dy == 2.0 * x * dx;
   }
   /* {xrst_code}

   Division
   ********
   {xrst_code cpp} */
   {  ad_double ay = ax / ax;
      double    dy = ay.derivative();
      ok          &= dy == 0.0;
   }
   /* {xrst_code}

   Return ok
   *********
{xrst_indent}
{xrst_code cpp} */
   return ok;
}
/* {xrst_code}

Example File
************
:ref:`class_example@This Example File`
is the same as for the parent of this page.
{xrst_end example_ad_double}