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lines 9-64 of file: include/cppad/core/unary_plus.hpp
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{xrst_begin unary_plus}

AD Unary Plus Operator
######################

Syntax
******
| *y* = + *x*

Purpose
*******
Performs the unary plus operation
(the result *y* is equal to the operand *x* ).

x
*
The operand *x* has one of the following prototypes

| |tab| ``const AD`` < *Base* >               & *x*
| |tab| ``const VecAD`` < *Base* >:: ``reference &`` *x*

y
*
The result *y* has type

   ``AD`` < *Base* > *y*

It is equal to the operand *x* .

Operation Sequence
******************
This is an AD of *Base*
:ref:`atomic operation<glossary@Operation@Atomic>`
and hence is part of the current
AD of *Base*
:ref:`operation sequence<glossary@Operation@Sequence>` .

Derivative
**********
If :math:`f` is a
:ref:`glossary@Base Function` ,

.. math::

   \D{[ + f(x) ]}{x} = \D{f(x)}{x}

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

{xrst_end unary_plus}