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share data flag behaviour #2584

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Merged
merged 1 commit into from
Jun 5, 2017
Merged

share data flag behaviour #2584

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13 changes: 9 additions & 4 deletions lib/iris/cube.py
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Original file line number Diff line number Diff line change
Expand Up @@ -778,14 +778,19 @@ def __init__(self, data, standard_name=None, long_name=None,

@property
def share_data(self):
"""Share cube data when slicing/indexing cube if True."""
"""
Share cube data when slicing/indexing cube if True.
Setting this flag to True will realise the data payload,
if it is lazy, as lazy data cannot currently be shared across cubes.

"""
return self._share_data

@share_data.setter
def share_data(self, value):
# Realise the data if is hasn't already been as sharing lazy data is
# not right now possible or a usecase understood.
if self.has_lazy_data():
# If value is True: realise the data (if is hasn't already been) as
# sharing lazy data is not possible.
if value and self.has_lazy_data():
_ = self.data
self._share_data = bool(value)

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