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Use PointerHolder in several places where manually memory allocation and deallocation were being used. This helps to protect against memory leaks when exceptions are thrown in surprising places.
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There were a few places in the code that were checking that a pointer wasn't null before deleting it, even though C++ has always allowed delete 0. Most of the code did not perform these checks.
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During periods of intensive operation on a specific file, this method can reduce the overhead of repeated open/close operations.
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ClosedFileInputSource is an input source that keeps the file closed when not reading it.