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lines 532-571 of file: include/cppad/example/valvector/class.hpp
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   {xrst_begin valvector_compound_op}

   The valvector Numeric Compound Assignment Operators
   ###################################################
   Computes the element-by-element result
   of the numeric compound assignment operators.

   Syntax
   ******
   | *y* *op* *x*

   op
   **
   The compound operator *op* is
   ``+=`` (compound addition) ,
   ``-=`` (compound subtraction),
   ``*=`` (compound multiplication) , or
   ``/=`` (compound division) .

   x
   *
   The operand *x* is a ``const`` valvector.

   y
   *
   The operand and result *y* is a valvector.

   Return
   ******
   The value returned by each of these operators is a reference to *y* .

   {xrst_toc_hidden
      example/valvector/compound_op.cpp
   }
   Example
   =======
   The file :ref:`valvector_compound_op.cpp-name` is an example and test of the
   valvector compound assignment operators.

   {xrst_end valvector_compound_op}