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Related Syntax | ||
operator |
is open |
Return type: Switch
Returns: Returns true if the stream has been opened or reopened and not yet closed, and false otherwise. Replacing is
with isnt
will reverse the results.
Syntax
stream-name indexer? (is | isnt) open
You can use is open
to determine if a stream variable is open. A stream is open if it has been opened or reopened, but is not yet closed.
The following code opens a stream if it is not already open:
open my-stream as buffer unless my-stream is open
The following code shows two OmniMark stream state tests that use isnt open
:
document-start local stream s ... open s as buffer when s isnt open ... close s when s isnt closed ...
Related Syntax |
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