def _backend(self):
"""
Query function for the c++ backend object.
"""
if self.__backend is None:
# Construct the c++ backend object.
cpp_types = stringListToStdVectorString(self.__types)
cpp_coords = numpy2DArrayToStdVectorStdVectorDouble(
self.__lattice.sites())
cpp_possible_types = Backend.StdMapStringInt(self.__possible_types)
# Send in the coordinates and types to construct the backend configuration.
self.__backend = Backend.Configuration(cpp_coords, cpp_types,
cpp_possible_types)
# Return the backend.
return self.__backend
def _backend(self, possible_types):
"""
Query for the local configuration backend object.
:param possible_types: A dict with the global mapping of type strings
to integers.
:returns: The interactions object in C++
"""
if self.__backend is None:
# Construct the c++ backend object.
cpp_types = Backend.StdVectorString(self.__types)
cpp_coords = numpy2DArrayToStdVectorStdVectorDouble(self.__coordinates)
cpp_possible_types = Backend.StdMapStringInt(possible_types)
# Send in the coordinates and types to construct the backend configuration.
self.__backend = Backend.Configuration(cpp_coords,
cpp_types,
cpp_possible_types)
# Return the backend.
return self.__backend
