Source code for simultipac.util.singleton

"""Define a base singleton pattern class."""

from abc import ABC



[docs]
class SingletonMeta(type, ABC):
    """Define singleton template to inherit from."""

    _instances = {}

    def __call__(cls, *args, **kwargs):
        """Create instance only if not already exists."""
        if cls not in cls._instances:
            cls._instances[cls] = super().__call__(*args, **kwargs)

        return cls._instances[cls]