.. index:: py::builtins::in

.. _doxycast_pypp_classpy_1_1builtins_1_1in:

.. _py-builtins-in:

*py::builtins::*\ in
====================

*Defined in* ``<pypp/builtins/in.hpp>``

.. code-block:: cpp

     template <class type>
     class in;

Implements Python's ``in`` operator.

``py::builtins::in`` implements Python's ``in`` operator, used to
check whether a iterable contains a value.


Template parameters
-------------------

``type``: The type of iterable.


Members
-------

*   :ref:`in <doxycast_pypp_classpy_1_1builtins_1_1in_1a8ad47d267d0e786c700784caa81cd0a3>`

*   :ref:`container <doxycast_pypp_classpy_1_1builtins_1_1in_1a3e36d84ec012d7510de8e9615161f7d8>`



.. toctree::
     :hidden:

     
     in <classpy_1_1builtins_1_1in_1a8ad47d267d0e786c700784caa81cd0a3>
     container <classpy_1_1builtins_1_1in_1a3e36d84ec012d7510de8e9615161f7d8>



Non-member helpers
------------------

*    :ref:`operator ->* <py-builtins-operator-pointer_to_member-in>`


Example
-------

.. code-block:: cpp

     #include <pypp/builtins/list.hpp>
     #include <pypp/builtins/in.hpp>
     #include <pypp/builtins/print.hpp>

     int main()
     {
         py::list<int> nums = {0, 1, 2, 3, 4, 5, 6};

         // Equivalent to ``4 in nums`` in Python
         py::print(4 ->* py::in(nums));
     }

**Output**:

.. code-block:: text

     true