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b9c1b51e45
*** to conform to clang-format’s LLVM style. This kind of mass change has
*** two obvious implications:
Firstly, merging this particular commit into a downstream fork may be a huge
effort. Alternatively, it may be worth merging all changes up to this commit,
performing the same reformatting operation locally, and then discarding the
merge for this particular commit. The commands used to accomplish this
reformatting were as follows (with current working directory as the root of
the repository):
find . \( -iname "*.c" -or -iname "*.cpp" -or -iname "*.h" -or -iname "*.mm" \) -exec clang-format -i {} +
find . -iname "*.py" -exec autopep8 --in-place --aggressive --aggressive {} + ;
The version of clang-format used was 3.9.0, and autopep8 was 1.2.4.
Secondly, “blame” style tools will generally point to this commit instead of
a meaningful prior commit. There are alternatives available that will attempt
to look through this change and find the appropriate prior commit. YMMV.
llvm-svn: 280751
59 lines
1.7 KiB
Python
59 lines
1.7 KiB
Python
# ====================================================================
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# Provides a with-style resource handler for optionally-None resources
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# ====================================================================
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class optional_with(object):
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# pylint: disable=too-few-public-methods
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# This is a wrapper - it is not meant to provide any extra methods.
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"""Provides a wrapper for objects supporting "with", allowing None.
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This lets a user use the "with object" syntax for resource usage
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(e.g. locks) even when the wrapped with object is None.
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e.g.
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wrapped_lock = optional_with(thread.Lock())
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with wrapped_lock:
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# Do something while the lock is obtained.
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pass
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might_be_none = None
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wrapped_none = optional_with(might_be_none)
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with wrapped_none:
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# This code here still works.
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pass
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This prevents having to write code like this when
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a lock is optional:
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if lock:
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lock.acquire()
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try:
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code_fragment_always_run()
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finally:
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if lock:
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lock.release()
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And I'd posit it is safer, as it becomes impossible to
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forget the try/finally using optional_with(), since
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the with syntax can be used.
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"""
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def __init__(self, wrapped_object):
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self.wrapped_object = wrapped_object
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def __enter__(self):
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if self.wrapped_object is not None:
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return self.wrapped_object.__enter__()
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else:
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return self
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def __exit__(self, the_type, value, traceback):
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if self.wrapped_object is not None:
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return self.wrapped_object.__exit__(the_type, value, traceback)
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else:
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# Don't suppress any exceptions
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return False
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