MongoDB C++ Driver 4.1.0
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#include <bsoncxx/v_noabi/bsoncxx/builder/stream/closed_context.hpp>
Indicates the document being constructed cannot be closed further.
Used as a template parameter for array_context, value_context or key_context. This could indicate that the document is the root, or that the type stack has been intentionally erased, as is the case when using callbacks in the stream api.