lines 9-53 of file: include/cppad/core/num_skip.hpp

{xrst_begin number_skip}

Number of Variables that Can be Skipped
#######################################

Syntax
******
*n* = *f* . ``number_skip`` ()

See Also
========
:ref:`fun_property-name`

Purpose
*******
The :ref:`conditional expressions<CondExp-name>` use either the
:ref:`if_true<CondExp-name>` or :ref:`if_false<CondExp-name>` .
Hence, some terms only need to be evaluated
depending on the value of the comparison in the conditional expression.
The :ref:`optimize-name` option is capable of detecting some of these
case and determining variables that can be skipped.
This routine returns the number such variables.

n
*
The return value *n* has type ``size_t``
is the number of variables that the optimizer has determined can be skipped
(given the independent variable values specified by the previous call to
:ref:`f.Forward<Forward-name>` for order zero).

f
*
The object *f* has prototype

   ``ADFun`` < *Base* > *f*

{xrst_toc_hidden
   example/general/number_skip.cpp
}
Example
*******
The file :ref:`number_skip.cpp-name`
contains an example and test of this function.

{xrst_end number_skip}