.. _ContainerDict:

####################
Container Dictionary
####################

The approach is similar to the :ref:`Lookup-Tables<ContainerTable>` and simply stores all states in a dictionary.
The index of each :ref:`state<State>`, :math:`\vert\Psi_i\rangle`, in the subsystem can be accessed directly via: :math:`\textbf{i} = \textbf{map} \left[\vert\Psi_i\rangle\right]`.
The memory usage is reduced compared to the :ref:`Lookup-Tables<ContainerTable>` in the case of small particle numbers making this approach superior to the tables.
There is no constraint on the length of the subsystem.


Data members
------------


.. doxygenvariable:: danceq::internal::ContainerDict::map

.. doxygenvariable:: danceq::internal::ContainerDict::L const

.. doxygenvariable:: danceq::internal::ContainerDict::n_max const

.. doxygenvariable:: danceq::internal::ContainerDict::maximal_state_per_n

.. doxygenvariable:: danceq::internal::ContainerDict::minimal_state_per_n