.. index:: py::builtins::range::index

.. _doxycast_pypp_classpy_1_1builtins_1_1range_1a6de9d773a22daa3246210e3c9bceaf52:

.. _py-builtins-range-index:

*py::builtins::range::*\ index
==============================

.. code-block:: cpp

     constexpr std::size_t index(const value_type& value) const;

Returns the index of given value.


Parameter
---------

``value``: The value to look for.


Return value
------------

The index of given element.


Exceptions
----------

:ref:`py-builtins-ValueError` if the element can't be found.


Complexity
----------

Constant.


Example
-------

.. code-block:: cpp

     #include <pypp/builtins/range.hpp>
     #include <pypp/builtins/print.hpp>

     int main()
     {
         py::range<int> nums(1, 10);
         py::print(nums.index(5));
     }

**Output**:

.. code-block:: text

     4