def _backend(self):
"""
Function for generating the C++ backend reperesentation of this object.
:returns: The C++ LatticeModel based on the parameters given to this class on construction.
"""
if self.__backend is None:
# Setup the C++ objects we need.
cpp_config = self.__configuration._backend()
cpp_lattice_map = self.__configuration._latticeMap()
cpp_interactions = self.__interactions._backend(
self.__configuration.possibleTypes(), cpp_lattice_map.nBasis(),
self.__configuration)
# Construct a timer.
self.__cpp_timer = Backend.SimulationTimer()
# Construct the backend object.
self.__backend = Backend.LatticeModel(cpp_config, self.__cpp_timer,
cpp_lattice_map,
cpp_interactions)
# Return.
return self.__backend
