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isreadonly

isreadonly(stream) -> Bool

Determine whether a stream is read-only.

Examples

1. Check if a file stream is read-only:

   julia> file = open("data.txt", "r");
   julia> isreadonly(file)
   true

   This example checks if the file stream file is read-only.

2. Check if a writeable stream is read-only:

   julia> writeable_stream = open("output.txt", "w");
   julia> isreadonly(writeable_stream)
   false

   It returns false since the writeable_stream is not read-only.

3. Check if a custom stream is read-only:

   julia> struct MyStream
             read_only::Bool
          end
   julia> stream = MyStream(true);
   julia> isreadonly(stream)
   true

   This example demonstrates how to use isreadonly with a custom stream object.

Common mistake example:

julia> isreadonly(5)
ERROR: MethodError: no method matching isreadonly(::Int64)

In this example, isreadonly is called with an argument of type Int64 which is not a stream. Ensure that the argument passed to isreadonly is a valid stream object to avoid such errors.

See Also

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