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Revert "[Add] metaclass of singleton"

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This reverts commit b05eb7142e.
This commit is contained in:
vn.py 2019-06-13 20:15:19 +08:00
parent b05eb7142e
commit 40bd01fdff
1 changed files with 0 additions and 14 deletions
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vnpy/trader/utility.py
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@ -445,17 +445,3 @@ def virtual(func: "callable"):
that can be (re)implemented by subclasses. that can be (re)implemented by subclasses.
""" """
return func return func
class Singleton(type):
"""
Metaclass for creating singleton object.
"""
_instances = {}
def __call__(cls, *args, **kwargs):
""""""
if cls not in cls._instances:
cls._instances[cls] = super(
Singleton, cls).__call__(*args, **kwargs)
return cls._instances[cls]