def is_int64_dtype(arr_or_dtype):
return _is_dtype_type(arr_or_dtype, classes(np.int64))<EOL>
Check whether the provided array or dtype is of the int64 dtype.

Parameters
----------
arr_or_dtype : array-like
    The array or dtype to check.

Returns
-------
boolean
    Whether or not the array or dtype is of the int64 dtype.

Notes
-----
Depending on system architecture, the return value of `is_int64_dtype(
int)` will be True if the OS uses 64-bit integers and False if the OS
uses 32-bit integers.

Examples
--------
>>> is_int64_dtype(str)
False
>>> is_int64_dtype(np.int32)
False
>>> is_int64_dtype(np.int64)
True
>>> is_int64_dtype('int8')
False
>>> is_int64_dtype('Int8')
False
>>> is_int64_dtype(pd.Int64Dtype)
True
>>> is_int64_dtype(float)
False
>>> is_int64_dtype(np.uint64)  # unsigned
False
>>> is_int64_dtype(np.array(['a', 'b']))
False
>>> is_int64_dtype(np.array([1, 2], dtype=np.int64))
True
>>> is_int64_dtype(pd.Index([1, 2.]))  # float
False
>>> is_int64_dtype(np.array([1, 2], dtype=np.uint32))  # unsigned
False