On 28/08/2014 16:21, Nick Treleaven wrote:
Code that uses doc->is_valid or DOC_VALID() outside of iterating
documents_array probably should be using document_find_by_id() instead,
because closed document pointers only stay invalid until another
document needs to be opened.

Additional: if there is no chance of another document having been opened since, but there is a chance a document was closed, it should be fine to check doc->is_valid.
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